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Any try these?
http://www.bridgestonetire.com/productdetails/Home/Turanza_with_Serenity_Technology
Supposed to be quiet
$229 at Tirerack http://www.tirerack.com/tires/tires...sidewall=Blackwall&partnum=245WR7TS&tab=Sizes
http://www.bridgestonetire.com/productdetails/Home/Turanza_with_Serenity_Technology
Supposed to be quiet
$229 at Tirerack http://www.tirerack.com/tires/tires...sidewall=Blackwall&partnum=245WR7TS&tab=Sizes
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AD08
I've been running AD07 front and AD08 rears for a few days now. I've put them through their paces and I have to say they're just fine. As expected the grip is a bit better than the T1Rs I had been running.
Frankly I can't see any reason to spend more to get the older AD07 rears.
I've been running AD07 front and AD08 rears for a few days now. I've put them through their paces and I have to say they're just fine. As expected the grip is a bit better than the T1Rs I had been running.
Frankly I can't see any reason to spend more to get the older AD07 rears.
Jaff
Active Member
Thanks for the input Doug...I think I'll switch to your config the next time I'm in the market!
There's a lot of good information in this thread but I'd at least put the Yokohama AD07s on all 4 tires or ADO7s on front and AD08s on rears. They will last a little longer (maybe 7,000 miles on the rear and 25,000 on the fronts). There are other tires that will last longer for the rears.
R888's are a street-legal competition tire. Great for autocross, but I don't think they're a good choice for daily driving.
I put a set of Michelin Pilot Super Sports on the rear last week based on the positive experience some other owners had expressed. I was looking for a bit better wear and better rain performance. Here's my experience so far:
That last item is an interesting one. At first I was concerned the tires were not sticky enough. However, the tires are proving capable of much larger Gs during acceleration than they are trying to inflict on the car during regenerative braking. That coupled with the fact the traction control during regen goes completely away after 1-2 miles makes me suspect this is possibly a minor issue related to the new tire diameter??? The new tires are 25", whereas the AD07s are 24.9". That doesn't seem like enough difference to be an issue, but I can't think of any other explanation. Here's my theory. The rear tires are larger and therefore spin slower than the "stock" tires. During regen, it appears to the car that the tires are slipping (ie. real slipping caused the rear tires to turn slower during regen). My guess is that the car monitors the speeds of the front vs rear tires during normal cruising (ie. not heavy accel or decel) and comes up with the proper ratio to base the traction control on. I'm guessing that when you start the car you are at a default ratio and the car is learns the real ratio after a mile or two? The only odd thing with this theory is the fact they wouldn't store the learned ratio for use on the next drive. However, doing so might cause some safety issues on the first mile or two after replacing tires. So perhaps they took the more conservative approach by always starting with a factory default which is over cautious (ie. more prone to throw on the traction control vs. less prone which would be less safe). I have NO idea whether this is really what is going on, so I'm all ears if anyone can come up with a better theory. Thankfully, the traction control during regen still allows probably about 50-60% of normal regen AND everything goes back to normal after a mile or two. I'm confident this will probably just go away once the tires have .1" of wear on them.
All in all, I'm very happy with the tires so far and consider the traction control a minor issue. I wouldn't be saying that if it was coming on during acceleration of course!
- They are much quieter
- Haven't had any rain yet, but the tread pattern definitley looks like it should do very well
- They are sticky enough to launch (full accelleration) on dry flat ground without any traction control. This does not of course mean they are as sticky as the Yokohoma, but the only way to know for sure would be in aggressive cornering at high speeds and/or acceleration, which I have not tested. Fortunately, I think I've gotten past the reckless point of testing such capabilities (like I did back when I first got the car).
- Traction control comes on a lot during regen (steadily blinks), but only for the first 1-2 miles after each start
That last item is an interesting one. At first I was concerned the tires were not sticky enough. However, the tires are proving capable of much larger Gs during acceleration than they are trying to inflict on the car during regenerative braking. That coupled with the fact the traction control during regen goes completely away after 1-2 miles makes me suspect this is possibly a minor issue related to the new tire diameter??? The new tires are 25", whereas the AD07s are 24.9". That doesn't seem like enough difference to be an issue, but I can't think of any other explanation. Here's my theory. The rear tires are larger and therefore spin slower than the "stock" tires. During regen, it appears to the car that the tires are slipping (ie. real slipping caused the rear tires to turn slower during regen). My guess is that the car monitors the speeds of the front vs rear tires during normal cruising (ie. not heavy accel or decel) and comes up with the proper ratio to base the traction control on. I'm guessing that when you start the car you are at a default ratio and the car is learns the real ratio after a mile or two? The only odd thing with this theory is the fact they wouldn't store the learned ratio for use on the next drive. However, doing so might cause some safety issues on the first mile or two after replacing tires. So perhaps they took the more conservative approach by always starting with a factory default which is over cautious (ie. more prone to throw on the traction control vs. less prone which would be less safe). I have NO idea whether this is really what is going on, so I'm all ears if anyone can come up with a better theory. Thankfully, the traction control during regen still allows probably about 50-60% of normal regen AND everything goes back to normal after a mile or two. I'm confident this will probably just go away once the tires have .1" of wear on them.
All in all, I'm very happy with the tires so far and consider the traction control a minor issue. I wouldn't be saying that if it was coming on during acceleration of course!
With those tires I can launch full accel on virtually any WET pavement without TC coming on. Not so with the AD07s.
I never have TC come on during regen (unless I run over something). Reading the rest of your post makes me wonder if you have a version 1.5 or are unaware of the new tire learning feature. You have to select a menu option for new tires and then the car will instruct you to drive a specific pattern to "learn" the new tires. It doesn't do it automatically every time you drive 2 miles. I think this feature is only on 2.x models.
Not sure how many miles are on your new Super Sports. Maybe you already know this but most performance tires need a good 500 miles or more to get broken in. They will be quiet but otherwise not perform as well when they are new. Mine got better for the first 1,000 miles or so.
I'm waiting for someone to give these a real test, like on a track or carefully measured 0-60 times. And, of course, I'm waiting for them to make it in the front size!
strider
Active Member
It's also possible the tires just take awhile to warm up. I have no idea if this carries over but I can tell you that Michelin motorcycle race tires take FOREVER to heat up. Once they're hot they last well and are fine tires but they are terrifying when cold. On acceleration the car may be limiting power but not enough to light the TC light. I notice with my Toyo Proxes 4's (less sticky than stock) that I get lower acceleration numbers when stomping on it (from the car's performance screen) and also less regen when the tires are cold but the TC light doesn't come on in either case.
You are correct, I have a 1.5 Roadster, which means it doesn't have the tire replacement screen/option. The tires only have about 100 miles on them, but I really doubt they are actually slipping during regen. I can't imagine them slipping during slow speed regens yet not slipping during high acceleration takeoffs. TC during regen is very consistent, even at very slow speeds. TC during regen completely disappears after 1-2 miles each and every time I go out for a drive. I'll try to do some more calibrated testing when I get a chance. If I determine that the TC during regen goes away at exactly the same mileage point on each trip, then I think it's pretty safe to conclude there's some sort of software algorithm at play. I'm still open to hearing other thoughts, theories or experiences out there. It's interesting the other Michelin Pilot Super Sport purchasers haven't seen this issue. Perhaps I'm the only one who has put them on a 1.5 Roadster?
What are you cold PSI pressures ? Try increasing the rears by 2 psi, or creating an additional 2 psi differential between rear/front ... this will depend on how close your current settings are to recommended pressures. HTH.
EDIT: I corrected this post below ... try the opposite (thanks, hcsharp!)
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That's funny, my reaction would have been to try decreasing the difference between front and rear. Not that I know what I'm doing... I think ChargeIt has a good idea to experiment with the relative tire pressures. You might want to also post your results in the 1.5 tire thread if not already.
Thanks for the suggestion hcsharp. I went ahead and posted to the 1.5 thread, as the regen issue I'm seeing is definitely a 1.5 issue. Still very happy with the Michelin Pilot Super Sports, so I want to again give a big thank you to the 2.5 owners who turned me onto them!
WHOA !! Thanks for catching that. YOU ARE RIGHT ... I must have been on some sort of meds ( kidding ... but I don't remember !!
:biggrin: )So ... let's re-write the whole thing ...
Try decreasing the rears by 2 psi, or reducing the differential between rear/front by 2 psi ... this will depend on how close your current settings are to recommended pressures. HTH.
You totally corded it! I don't think you really got 11k miles out of them... they were probably not street legal for the last few thousand miles.
I'm guessing you don't drive in the rain very much, because that would totally hydroplane at highway speeds.
I'm guessing you don't drive in the rain very much, because that would totally hydroplane at highway speeds.
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