Wheel alignment

Showing posts with label Bridgestone T31. Show all posts
Showing posts with label Bridgestone T31. Show all posts

Monday, 13 September 2021

Michelin Road 5 end of life review



Front Michelin Road 5 @ 10,400 km

Rear Michelin Road 5 @ 10,400 km

Tyre choice can be a contentious issue as it's so dependent on intended end use and personal preference in terms of "feel".  Add in the other relevant factors such as tyre pressures, weather conditions, ambient temperatures, road surface, bike suspension and geometry, all up weight etc and decision-making can become overwhelming.  

Since retirement in 2008, we've lived on NZ's Coromandel Peninsula which is a road rider's paradise with highly technical twisty roads (look up the Coromandel Loop on YouTube!) with a road surface mainly composed of a coarse chip surface on the western side and smoother seal on the eastern side.  During that time, I've owned a Honda Blackbird, Triumph Street Triple, Suzuki GSX-S1000 and a KTM 790 Duke.  For the last 10 years, I've also been heavily involved with NZ branch of the UK Institute of Advanced Motorists.  Being fully retired also means that commuting has been taken out of the equation as riding has just been for fun and advanced rider mentoring with IAM.  What I'm getting at is that for a good many years, I've ridden a number of bikes under pretty much identical conditions with different brands and types of tyre which is useful for comparative purposes.

There are numerous tyre reviews in this blog but summarising, my preference has been for sport touring tyres as I ride in all weather conditions and cover up to 20,000 km a year.  The Suzuki and KTM came equipped with Dunlop and Maxxis pure sport tyres respectively and they were awful things for my intended use.  Firstly, in colder or wet conditions, it was nigh on impossible to generate sufficient heat for decent grip.  I had some butt-clenching slides when riding appropriately to the conditions and both bikes were also equipped with traction control.  One was when the front end let go and that was seriously scary.  The second factor is the life of a pure sport tyre.  For the environment I ride in, both brands of tyre were stuffed by 3500 km!  A good way of going bankrupt over my annual distance.  As long as a tyre delivers around 10,000 km, I'm a happy camper.  Actual tyre price is irrelevant as  performance (longevity and grip) is the only consideration.

In more recent years and in terms of sport touring tyres, I've used the Metzler Roadtec 01, the Bridgestone T31 and the Michelin Road 5.  All of these tyres gave the grip I was looking for over a wide range of weather conditions but it's worth mentioning where there were notable differences. 

The Roadtec 01 was a good tyre and the full review is HERE .  Two sets fitted to the Suzuki with the same result. Excellent grip in all conditions and a good life.  The rear hoop retained its profile well but the front noticeably started to lose its shape from about 7000-8000 km onward, developing flats on the outer part of the tyre. (A triangular or wedge profile).  Undoubtedly, countersteering and the type of roads I ride on contributed to this but the bike also had good aftermarket suspension set up by renowned guru Dave Moss so the front end wear characteristic was a little disappointing.  I should have replaced the front earlier than my normal habit of replacing both at the same time.

I also had Road 5's on the Suzuki.  In terms of performance, they delivered everything I wanted, including a faster turn-in than the 01's due to a sharper profile.  Unfortunately, I had a series of punctures including a destroyed rear hoop at 2000 km. I'm fairly certain that it was sheer bad luck as opposed to a tyre shortcoming but as I sold the bike not long afterwards, a longer term evaluation wasn't possible. However, I have occasionally seen comments from other owners around the world about "above average frequency" punctures.  Just something to file in the back of the mind.

After buying the KTM 790 and the poor experience with the OEM Maxxis pure sport tyres, I tried a pair of the Bridgestone T31 sport touring tyres as they had good reviews. Hmmm..... do motorcycle magazine reviews truly reflect everyday road performance over a representative period of time?  I suspect not.  Again, grip was satisfactory in all conditions but the front tyre developed a pronounced triangular/wedge profile from about 6000 km onwards.   At 8500 km, the profile was so bad that handling was adversely affected and both tyres were changed for a set of Road 5's.

The T31 front tyre at 8500 km

The Road 5's on the KTM have just clocked up 10,400 km and although it would be possible to legally squeeze more out of them before reaching the wear bar indicators, I'll get them replaced as soon as the 320 km round trip to my dealer can be made.  In a nutshell, they've been absolutely superb.  Outstanding grip in all conditions and equally importantly, they have pretty much retained their profile throughout with no noticeable loss in handling.

Front profile @ 10,400 km

In the following photo, the roughened part of the tyre is the outer soft compound and the wear bar indicator is about 0.5mm below the tyre surface.  The tread block with the sharp entry just to the right of the indicator is lifting slightly due to tearing.  This is occurring round the full circumference of the tyre but is so minor that it doesn't affect the handling.

Front tyre wear at the junction between the softer edge compound and harder centre

The rear tyre shown below has retained an excellent profile throughout the 10,000km+ life. If more time had been spent on straighter roads, the expectation would presumably be for a less-rounded profile.

Excellent profile at 10,400 km

In the photo below, a small amount of raised "feathering" can be seen in the soft compound at the rear of the large rain groove.  It doesn't affect the handling at all and has only become noticeable in the last 1000-2000km.  The most likely cause is less than optimal rebound damping as the OEM White Power shock on the KTM doesn't have the adjustability features of a high end one such as Ohlins, Penske, Nitron etc.  Nonetheless, the bike handles superbly and as the feathering is minor, no action is required at present.  For normal road riding, front tyre pressure is around 34 psi and the rear is 37-38 psi.

A small degree of feathering on the rear of the large rain groove

In summary, the Michelin Road 5 delivers everything required for the type of riding I currently do and the next set will be a straight replacement.  There are relatively few poor tyres on the market unless we buy some virtually unknown dodgy brand in pursuit of false economy.  I'd go further and say that most of us (and most certainly me) will run out of talent long before shortcomings in any of the major brands become apparent.  The real trick is to figure out what type (not brand) of tyre you need in the first place.  However, as I hope this blog post shows, there can be considerable differences in how long tyres of the same general type (e.g sport touring) lasts overall and how well they retain their profile.  I'm just glad that the Road 5 is a perfect fit for the KTM and the type of riding I do.

Oh and by the way, good suspension will really extend your tyre life.  I fitted a top of the line Penske on my Blackbird plus upgraded fork internals.  Gained nearly 2000 km from a set of tyres.

Wednesday, 20 May 2020

New tyres - again!

I bought the KTM in March last year, a replacement for the Suzuki GSX-S 1000 which I'd owned for the previous 3 years.  Regular readers may remember that the last tyres I had on the Suzuki were Michelin Road 5's. I loved their wet and dry weather performance and "feel".  What I didn't love was getting 3 punctures in 4 months, including one rear tyre which was beyond repair.  I live a long way from tyre dealers and it's a good job that I carry enough repair options to not get stranded.  The whole saga was listed in THIS POST .   Naturally, I became a bit gun-shy of the Road 5, not knowing whether they were susceptible to punctures in the conditions I normally ride in or whether it was sheer bad luck.

The problem sort of solved itself with the sale of the Gixxer and the purchase of the KTM.  The birds sang in the trees, the sun shone and all was well with the world - until winter came.  The KTM came equipped with Maxxis pure sport tyres.  They gripped well in the warmer weather but as soon as the cold and wet arrived, they became unpredictable, even with the benefit of lean-sensitive traction control.  I guess the problem was exacerbated by the roads in our area.  Some of the best technical twisty roads for bikes anywhere but challenging when it's cold and wet.  Simply couldn't get enough heat into the tyres in those conditions and on one occasion, I lost the front end in a fairly big way but managed to stay on.  It wasn't as if  I was "pressing on" excessively either.  I didn't trust the bloody things after that and within a few days and only 3500 km from new, they were ditched and a set of Bridgestone T31 sport touring tyres had been fitted.

Recovering from eye surgery and Covid-19 lockdown excepted, I cover a fair bit of ground annually and in all weathers so fitting sport touring tyres made sense.  On the bikes I've owned over the last few years, a life of a bit better than 10,000 km was achieved from any of the main brands and this sort of life was acceptable.  I chose the T31 based on a series of positive reviews in the motorcycling press and a fellow Institute of Advanced Motorists friend had recently fitted them to his Hayabusa and was impressed with them in all conditions.  My experience was the same as his.  Nice, progressive turn-in to corners although not quite as fast as the Road 5's.  Grip in both wet and dry was excellent and on our  North Island Green Badge Tour in late Feb/early March, they were great.

The only downside was that at 6000 km, the front hoop had started developing a slight wedge shape in section, i.e, flats on the soft compound out towards the edge of the tyre.  The rear tyre was still in good shape.  This wasn't anything particularly new as my previous 3 bikes had all shown similar traits.  The twisty roads that I mainly inhabit coupled with fairly aggressive countersteering to maintain progress are the main contributors.  Where the T31 differed however was that by 8500 km, the front tyre had reached the wear bars on the right hand side (the effect of road camber, driving on the left) and the left hand side wasn't far behind.  The handling had become noticeably heavier on the turn-in too.

Front T31 @8500 km


Arrow showing the extent of "flattening" @ 8500 km

The same characteristics also manifested themselves on my mate's Hayabusa, junking it at 7000 km and at 6000 km, another friend with a Yamaha MT10 SP is showing the beginnings of the same problem.  Time for a replacement set!

Apart from the punctures on the GSX-S 1000, the Road 5's were the best all-round tyres I've had for the type of riding I do so the decision was to go for them on the KTM and put the past experience with punctures down to sheer bad luck.

A quick trip to Drury in South Auckland yesterday and a new set were fitted in 3/4 hour.  Service from Aida and Des is outstanding.

Des from the Drury Motorcycle Performance Centre fitting the Rear Road 5

New front Road 5 away being balanced

New tyres always feel "flighty" compared with worn ones and leaving Drury, only a light touch on the bars was required for directional changes compared with the worn T31's.  Most of the 130 km trip home was at a cautious pace and angle of lean, not wanting to skate along on my arse due to new tyres. No anxious moments at all and the handling of the bike has been totally transformed.  With the higher crown profile on the Road 5's, turn-in is really quick too and requires much less countersteering.  Really looking forward to seeing how they go compared to the T31's in terms of performance and life.

Rear Road 5 profile

Front Road 5 profile

Thursday, 7 November 2019

Summer has come early!

Thanks to our Australian cousins pushing some of their second-hand weather to us across the Ditch, we've had a week of hot dry weather ranging from the high 20's C to mid 30's in some parts.  A great opportunity for getting out and doing stuff before it turns to custard this weekend.

It started with a bit of gardening, then as Jennie and I happened to have a clear calendar at the same time, a spot of fishing one afternoon.  Didn't start off well though.  We launch at a ramp at the end of our street.  Whilst getting the boat ready, I neglected to lock the trailer jockey wheel (shown in the photo below) in the "up" position.  This had the wheel bouncing up and down onto the road and as it only had a plastic hub, it had destroyed itself and disappeared before we got to the ramp, also yanking out the trailer electrical plug,  That dragged on the road and was a sorry sight - bugger!

Intact jockey wheel before setting off

The wheel is only used for positioning the boat in the garden so not a big deal other than coughing up $50 for a new wheel and an electrical plug.  Jennie didn't even call me a complete plonker so the ego didn't take too much of a battering.

Fishing was a bit slow but we didn't worry too much as the weather was so stunning.  As usual, Madame caught more than me.  I'm sure it must be due to the amount of time I spend cutting up bait for her out on the water, sigh.....

A beautiful day offshore

The cats woke me up early this morning demanding a feed so it was a good opportunity to have a quick breakfast, jump on the bike and test my new Revit Tornado 2 mesh jacket (see previous post) with the liner removed.  Setting off in 19 degrees C, it was a little cool on the arms as I only had a T shirt underneath, but certainly not unpleasant.  As the temperature climbed into the mid-20's it was absolutely superb - a great buy.

As I got to Whitianga, I noticed an old DC3 flying low over the water.  As they're few and far between, I guessed that it was a scenic flight from the home base at Ardmore, just south of Auckland where the Warbirds are based.  A quick diversion to the grass strip at Whitianga and it had just landed, disgorging its passengers.  What a great sight.  (This is the link to the DC3 website: Fly Back In Time .

Passengers disembarking for a look round Whitianga

Security is just a gate with a "Restricted" notice on it!

After that excellent interlude, it was on to Cooks Beach, a really scenic location on the eastern side of the Coromandel Peninsula, not far from the famous Hot Water Beach.  In the background of the photo below, sea fog was present although it burned off pretty quickly.

Just spectacular - Cooks Beach and Mercury Bay

Mercury Bay was so-named after English explorer and master mariner Captain James Cook landed on the shores here to observe the transit of Mercury in November 1769.  The observation point was apparently pretty close to where the bike was parked in the photo!

Sea fog burning off - eastern end of Cooks Beach

Whitianga waterfront on the way home

Time to head home for lunch, a very pleasant round trip of about 170 km.  On arriving home,  I noticed that my front T31 tyre was a bit chewed towards the edges.  The shoulder is a softer compound and clearly, the high road temperatures combined with the twisty route and coarse chip (not to mention enthusiastic countersteering!) had taken its toll.  Apart from this, they are proving to be pretty durable.  4000 km so far on this set with little wear and they grip well in all conditions.  They were fitted in early winter when the OEM pure sport tyres were found wanting.  It will be interesting to see how they wear with the higher summer road temperatures.

Front T31 - a bit rough around the shoulders

Finally, a shot of Sam and Annie this afternoon vying for a comfortable spot on our bed.  Annie has pretty much accepted Sam now (see Sam's arrival a few months ago HERE).  She's half his size but still bosses him about from time to time to keep him in his place!  Sam's about a year old and Annie is 8.

Sam and Annie vying for a comfortable spot


All in all, a pretty good week and roll on summer!


Monday, 8 July 2019

T time!

Life with Bad Girl Lola, the 790 Duke has been pretty darned good.  It makes me grin every time I ride it, quietly whispering in my ear to misbehave.  I can ignore those whisperings..... mostly.  Goes like heck, sounds fantastic and handles like a dream..... but now winter's here, something needs my urgent attention.

The OEM tyres are Maxxis brand pure sport, designed especially for the Duke.  They've done about 3500 km and probably have another 1500 km in them before replacement.  Up to now, they've gripped pretty well, even in the wet on warm days.  However, pure sport tyres need heat to maximise grip and that's hard to achieve once the mercury starts to dip into low single figures Celsius.

Winter in NZ - equipped with the OEM Maxxis pure sport tyres

I was going to replace them with a longer-lasting sport touring tyre anyway when they were closer to being worn out but an IAM coaching ride last weekend suggested that I'd better do something pronto.  Towards the southern end of our peninsula, some stretches of the twisty main road get little or no sun for a few weeks.  Things can get a little slimy on the surface and on a really cold day, maybe even a touch of frost.

A bit of prudence is required at those spots and with low single digit C air temperatures, I was riding accordingly.  Rounding one corner, the front end started washing out, then gripped.  It wasn't a trouser-soiling moment but it certainly got my attention!  For anyone who had lost the front end on a bike, it's not a pleasant sensation.  Easing back even more, I stuck the bike in rain mode to get maximum traction.  No more incidents thank goodness but even on dry roads, wasn't game to really push because the steering felt slightly vague on corners when I upped the pace.  It was only when temperatures climbed to around 10 degrees or thereabouts that I felt comfortable.  With more winter rides coming up, it was time to do something.

With my IAM responsibilities, I don't always get to choose the conditions I ride in, so a sport touring tyre makes a lot of sense.  Sport touring tyres warm up quickly, disperse rain well and give excellent grip in marginal conditions.  They last a sight longer than pure sport tyres too.  First thought was to fit Michelin Road 5's like I had on the GSX-S1000.  A fantastic tyre in all respects with one slight worry hanging over them.  On the Suzuki, I had 3 punctures in 4 months last summer on the Road 5's and in one case, the rear tyre was a write-off.  It may have been sheer bad luck, a susceptibility due to the conditions and road surfaces I normally ride on, or a combination of both.  Living a long way from a source of new tyres or professional permanent repairs, getting stranded somewhere is a real concern, even with a decent repair kit on board.

Whatever the reason for the punctures, it's left me slightly gun-shy of Road 5's so started looking at alternatives.  Without going through all the options I looked at, the one which stood out on all the road tests was the Bridgestone T31.  I've never used the Bridgestone brand before but the T31's stood out, both when fanging it and in adverse conditions.  A mate had also tried them on his Hayabusa and was glowing in his praise.  The rain groove pattern isn't as radical as the Road 5's but any innovative work on the carcass or compound is well out of sight anyway.

Bridgestone T31 sport touring tyres

Arriving at the Drury Performance Centre in south Auckland, the bike was put straight on the hoist for the changeover.

No mucking about - 2 minutes after I arrived

Rear fitted with new rubber

The front away being balanced

Less than an hour after arriving, I was on my way again, having also been given freshly-made coffee, a new neck warmer and a polishing cloth - excellent service.  I use two dealers for tyres, both about the same distance from home.  Both of them give terrific service so I tend to use them alternately. 

Took it fairly steady for most of the trip home as it wouldn't be a good look to bin a bike with new tyres.  The roads were also damp and distinctly green in places where the sun doesn't reach.  Even so, the T31's felt really good, with a nice, progressive roll-in into corners.  A proper evaluation will have to wait until later, but no anxious moments at all.

Something else happened on the low temperature ride last week which triggered the thoughts of getting new tyres pronto.  Leaving home early in the morning, the air temperature according to the instrumentation was 9 degrees Celsius.  Heading south, it progressively dropped and looking down at the instrument at one stage, it had gone completely white with a large snowflake icon!  The words "Ice Warning" were clearly displayed.  The digital speedo km/hr readout was the only other data showing at that stage and even that was displayed in much smaller font.  

It was all a bit of a surprise and as the lack of other data irritated me, I started prodding various buttons until the normal display returned. Even then, it had a small lit warning triangle displayed until temperatures climbed somewhat.  Went through the 790 manual on my return and it's not a listed feature.  However, I went on line to do a bit of research and it's listed in the PDF manual for the 790 adventure model.

I'm not really one for adding stuff to the bike for aesthetics alone but I broke that rule the other day.  The original KTM brake and clutch levers are pretty basic-looking and finished in matte black.  On eBay, I saw some levers with a titanium and black finish which are fully adjustable in terms of both hand span and length.  They looked good, weren't hideously expensive so decided to take a punt.  They arrived a couple of days ago and are beautifully made.  Took less than 30 minutes to fit the pair.

Cool-looking levers

I also fitted a non-reflective film to the instrument face as it's hard to see when the sun is reflecting off it.  Have yet to test how effective it is.  The only other modification on the cards is to spray the rear face of my mini-screen matte black.  The LED headlight reflects some light onto the inside of the screen.  It's absolutely fine in daylight but when riding at night, it can be a bit distracting.  A matte finish should take care of that.

To end on a non-motorcycling note, winter is the time when various birds come into the garden looking for a bit of supplemental food.  The succulent shown in the top photo weeps nectar and attracts Tui, a songbird a little larger than a blackbird.  In sunlight, their plumage is a spectacular dark metallic green-blue.  Here's a photo I took a few days ago.

The Tui (also known as a Parson Bird because of the white ruff)

The most spectacular bird in the garden is the NZ native pigeon.  About twice the size of a European pigeon, the plumage is stunning.  Pigeons come into the garden to feast on Kowhai tree leaves and in a few weeks, on the Kowhai flowers. They don't show much fear of humans and allowed me to get pretty close for the following photo.  Gorgeous, isn't it?

NZ native pigeon


Thursday, 21 January 2016

Tyre time and other stuff!

If anyone remembers my original ramblings about tyre selection, tyre life and the review of the Michelin PR3 and PR4 tyres (HERE), one of the things I commented on was the difference between sport and sport-touring tyres.

The OEM tyres fitted to the GSX-S 1000 are Dunlop D214's - 120/70 x 17 up front and a 190/50 x 17 rear. They're a pure sport tyre and never was there a more graphic example of a soft compound tyre in that I've completely stuffed them in 3700 km! Given that this was road riding with no track days and that I cover at least 15,000 km annually, the bike would be forever in the tyre shop and Jennie would be less than pleased at the expenditure! Hate to think what the life would be like if I had the traction control turned off.

Front tyre almost down to the depth indicator

Back tyre almost destroyed

That's only part of the story though.  Whilst the D214's gripped well in hot, dry conditions, they were unpredictable in the wet when it was harder to get heat into them.  Even with the traction control set in wet weather mode, I always had the feeling that the bike was just waiting to dump me on my arse with one false move in wet conditions.

So it's back to my favourite all-weather tyre, the Michelin PR4.  I never ran out of grip on the Street Triple even in the most horrendous wet conditions.  In the dry, I ran out of talent before they looked like letting go and if they give me somewhere in the region of 8000-10000km on the GSX-S, that will be absolutely fine.

A ride up to Auckland in perfect conditions to have the PR4's fitted and here they are:

Rear and front Michelin PR4's

The OEM Dunlops were a bit sluggish on the turn-in when changing direction rapidly, at least compared to my Street Triple.  After some internet searching and a discussion with a Hayabusa owner (thanks Rob!), it was thought that the steering could be made a little quicker by replacing the 50 profile Dunlop with a 55 profile Michelin which has a steeper crown.  The photo below shows where the differences are.  The cardboard template was made by me when the D214's were almost new. (Yep, I really AM that anal)!  It can be seen that the PR4 is is less full (or pointier if you prefer!).  Riding home, the direction change was far better, requiring less countersteering to get the same result.  Of course, new tyres always feel better than old ones but the change in profile would have also contributed significantly.  The other interesting difference which may help with turn-in is tyre width - the PR4 is approximately 7 mm narrower than the D214 although they are both 190's.

Rear Dunlop D214  (cardboard template) and Michelin PR4 profile comparison

On reaching home, the other job was to check front/rear wheel alignment with the home-built laser rig which has been used on all my bikes since 2003 (see HERE).  Haven't done it since owning the Suzuki so had to adapt the laser holder for the Street Triple.  Here it is:

Laser emitter set up for beam to just touch maximum width of rear tyre

Measuring the offset on both sides of the front tyre front and rear at maximum width

Sure enough, the front and rear wheels were out of alignment by rather more than I was happy with.  There are many reasons for misalignment which would fill a post by itself but having accurately measured the misalignment, I was then able to quickly reduce it to about a 4 mm offset with both wheels parallel.  That's probably quite satisfactory in the scheme of things.

Finally on things automotive but not bikes, it's the end of another era.  Jennie has owned her Special Edition MX5 since late 2007 when we imported it directly from Japan.  Only 3000 Special Editions in that colour were available worldwide and we were lucky to get one in mint condition.  It's been kept in that condition and has only racked up 47000 km.  Fellow moto-blogger Sonja got to drive it when she was visiting NZ. However, Jennie has found the driving position less comfortable in recent times so the decision was reluctantly made to part with it.

We advertised it on the NZ equivalent of eBay and were blown away with the interest - inundated with phone calls and emails for several days from all round the country!  The first person to see it bought it and we were delighted for the young man who drove for 3 hours and made it to our place first. He'd done his homework and was clearly an enthusiast.

2000 Special Edition MX5

For the replacement, the two main criteria were that it had to have a comfortable driving position and have decent performance.  Or as Jennie said to our daughter "DEFINITELY NOT A GRANNY CAR"!  After much perusing of specifications and a 2 hour test drive, she fell totally in love with this:

The Honda Jazz Rally Sport

Couldn't keep the grin off her face. She's ordered one in a similar colour to the MX-5 and it will be here in a few days. Not only has it got a surprising amount of grunt, it corners like it's on rails thanks to traction control and a whole load of additional electronic aids.  Must say that I was impressed too.  Thanks to the clever folding seat arrangement, it's got more useable carrying capacity than my RAV4.  Guess the same conditions will apply as per the MX-5.  If I want to drive it, then I have to keep it clean and polished!  Wonder if it's a good time to ask for new leathers?

Addendum:
Since this post covering tyres, there has been a review of the Metzler Roadtec 01 HERE , fitting Michelin Road 5's HERE  and Bridgestone T31's HERE and HERE