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KEEP M3POST ALIVE BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER LINK! |
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11-23-2012, 09:44 AM | #1 |
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Adverse Effects Upsizing Just Rear Tires?
My 2011 E92 has the PS2s in OEM sizes on ZCP wheels. With almost 11,000 miles on my car, the rears are practically shot.
I want to purchase the Michelin Super Sports in 275/35 and keep my front (245/35) tires on for a bit as they're not ready to be replaced. Will I have any issues to speak of with this setup? Once the front tires are ready for replacing, I would size up to 255/35. |
11-23-2012, 10:11 AM | #2 |
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In theory you should experience more understeer with wider rears. For normal street driving you should not notice a difference. In theory you could correct the extra understeer by taking camber out of the back with an alignment. (=overkill)
Other than that tire diameter is pretty close to 265 so there shouldn't be any issues. |
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11-23-2012, 10:53 AM | #3 | |
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11-23-2012, 11:13 AM | #4 |
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11-23-2012, 11:19 AM | #5 |
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11-23-2012, 12:52 PM | #6 |
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11-23-2012, 12:54 PM | #7 |
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11-23-2012, 12:57 PM | #8 |
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Aaah, gotcha. I grew up in Rockville/Potomac.
Looks like you've been to a bunch of track events (I viewed some of your earlier posts). I just picked up my M3 about two months ago and look forward to some HPDEs this spring! |
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11-23-2012, 01:06 PM | #9 |
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You'll have a blast at the track with your M3! Although Summit Point is conveniently located, a trip to VIR is soooo worth it
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11-23-2012, 01:13 PM | #10 | |
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I also did an HPDE at Summit Point's Shenandoah Circuit several years ago and enjoyed that too! With which orgainization do you belong to for track events? |
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11-24-2012, 07:05 AM | #11 | |
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I've tracked with pretty much every organization in our area. However, I haven't participated in a SP FATT for over 15 years! SP Seat Time events are a great value. |
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11-25-2012, 03:25 AM | #12 | |
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Upsizing the rears only will have more effects than just increasing the tendency for understeer at the limit; you may also increase oversteer in the wet as the wider rear tyres are more prone to aquaplaning. Not only that, the car will also be raised slightly at the rear due to the increased height of the tyre sidewall, and the roll characteristic of the rear will also be changed due to an increase in rear track width. These changes will undoubtedly affect handling balance. Therefore, if you want to upsize, do it proportionally. Last edited by mlhj83; 11-25-2012 at 09:55 PM.. |
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11-25-2012, 12:33 PM | #13 | |
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As the previous poster stated, the roll difference is significant. The PS2 does not generate as much lateral grip as the PSS. It will make for a very wonky handling car at the limit. The fronts will not be able to generate enough grip and the car will understeer significantly more than with matched PS2's. I have tried the two different kinds of tires on my own car and found this result. Even with full PSS in stock sizes, the car rolls more with the additional grip (given nothing else in the suspension changed such as camber, spring rates, toe settings-- the whole car has more grip and it takes more throttle to get the rear tires to break traction). But, like other posters say, if you never track the car or drive with MDM on/DSC off the difference will not be very large. In principle, though, I would run matching front and rears. Another 11K miles is a long time to drive with mismatched tires. I bought this car for the way the whole package behaves under all conditions and if my car handled funky when pushed hard it would annoy me greatly. Go full PS2 or full PSS. Both are incredibly good tires (even PS2 still). |
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