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07-27-2013, 01:00 AM | #1 |
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Rear Tyres - Wear rates and pressures?
Hi All,
What's everyone's experience with the wear rate on their rear tyres? My current rears have only done about 4000Kms, and the outsides are almost worn to the tread wear indicators. Have always kept the pressure at 300kPa (43-44 psi). Am now thinking that the rear pressures need to be higher (320kPA?). The fronts are fine (270kPa, 39psi). Thoughts? Experiences? |
07-27-2013, 01:41 AM | #2 | |
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I run 38 all four corners. Sounds like a bad alignment? |
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07-27-2013, 04:21 PM | #3 |
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You're running 38 psi and getting even wear? Road tyres? Done any track days on them?
Sorry, by "outsides" I meant both edges of the tyre (so inside edge and outside edge). The centre is fine, which makes me think the tyre pressure is too low, otherwise I'd expect the tyre to wear a lot more evenly. I'm wondering if it's normal for these cars to eat rear tyres more quickly than fronts? I recall a conversation with another owner who said he replaces rear tyres more often. |
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07-27-2013, 07:14 PM | #4 | |
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I've always run my cars at 38-39. Current tyres on the M3 are Conti 5P. My wear is really even, perhaps a tiny bit more on the front which would be from the track sessions. It's surprising because I run max camber and have tracked these tyres a few times when I haven't been able to get the slicks on. The inside edge of mine is worn the same as the outside edge, so maybe it is related to alignment/neg-camber and hard cornering |
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07-27-2013, 11:02 PM | #5 | |
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07-28-2013, 12:50 AM | #6 |
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Definitely get a wheel alignment, and get one regularly. As Dave posted, I agree, every 6 months is a good idea.
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.: 2010 E71 X6M - stock, daily driver, towcar :. .: 2008 E92 M3 - 6MT, Carbon Roof, Eibach Springs, Megan Axle Back exhaust :. .: 1997 E36 323i Frankenstein - too much to list, track whore, stripped, caged, MoTeC, S85B50 :. .: 1994 E36 M3 3.0 - 19" BBS LM Reps, Bilsteins :. |
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07-28-2013, 02:04 AM | #7 |
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Thanks all for the input. Sounds like it's time to get an alignment done as it's been over a year since the last one.
The current tyres are Kumho KU31's. As a road tyre, I'm happy with them and rate them better than the Pirelli P-Zeros I had just prior (terrible understeer in the wet). Did a track day yesterday at Morgan Park (first time there, great fun), and after two laps I was starting to slide about. So, not a good tyre for the track. Any recommendations on a shop to do the alignment in Brisbane? Or does everyone just take their car to their local franchise (Bob J, Beaurepaires, Tyre Power, etc...)? Last edited by EarthboundMisfit; 07-28-2013 at 02:05 AM.. Reason: typo |
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07-28-2013, 02:40 AM | #8 | |
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Mike doesn't do them himself but will advise you who is good. Mike is ex BMW and specialises in our cars plus Audi/VW. Highly recommended in Brisbane. |
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07-28-2013, 02:45 AM | #9 |
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Hey mate, are they stock 18 or 19" rims? I think KU31's are a mid tier tyre, but looking at their specs, they don't seem to make the correct sizes for OEM rear rims.
So you might be running a thinner or narrower tyre which might explain your wear troubles. The M3 also requires high load-rated tyres which narrows the choice of available tyres significantly. Perhaps you're running the wrong size tyres and throw in a couple track sessions and they're feathered and smashed? |
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07-28-2013, 02:46 AM | #10 | |
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07-28-2013, 05:27 AM | #11 | |
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I've had Michelins and Pirelli's on the car, and have now given Kumho's a go. Who knows, I might try something else next (but not Pirelli's!!). Anyway, I'll likely get the alignment checked. Thanks for the input. |
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07-28-2013, 05:32 AM | #12 | |
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07-28-2013, 06:06 AM | #13 | |
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Your rears tyres are only 1% bigger than stock with a side wall increase of 3.8% (according to the tire calculator app) so it's well within range. It claims your speedo error is 1% higher so it has to be your alignment. |
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07-28-2013, 06:36 AM | #14 | |
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I run 10" race wheels with 275 slicks and found I can't run any wider otherwise the sidewalls buckle and get sloppy. Usually 265 is the widest recommended for a 9.5" rim, so it might be a factor if the KU31's have a softer sidewall What problem did you have with pirelli out of interest? |
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07-28-2013, 11:17 PM | #15 |
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why do u guys run such high pressures on the road (track is another matter) when the doorcard specifies 35psi?
also whats wrong with the pirellis?
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07-29-2013, 12:31 AM | #16 | |
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On the tyre placard option on the rear is 3 bar (44 psi) /2.7 bar (39 psi) for 4 passengers. Due to excellent wear and handling I'm happy to run these pressures |
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07-29-2013, 06:11 AM | #18 | |
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So, anecdotal evidence only (and maybe I just happened to have back luck with Pirellis), but I know I won't buy them again and am happy to experiment with other tyres to find the ones I like. Cheers. |
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07-29-2013, 06:48 PM | #19 |
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Hmm I never had many positives things about the KU31's on my previous car other than the fact they were cheap!
The tyre noise drove me insane, and it was a world of difference when I went from the kumhos to continental sport 3's in terms of road noise, grip and wet weather performance! |
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08-01-2013, 03:10 AM | #21 |
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08-02-2013, 07:50 PM | #22 |
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