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KEEP M3POST ALIVE BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER LINK! |
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05-12-2013, 08:46 PM | #23 |
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05-13-2013, 08:14 AM | #24 |
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I would never say having new rubber on the car is unfortunate. I do like the 255/265 tire set-up idea. For my use of the car the stock set up is good but a little bit more bite up front would be great.
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06-02-2013, 02:41 PM | #25 |
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OK, so I have done a little extrapolation based on pictures (see thread http://www.m3post.com/forums/showthread.php?t=848092) and some math to figure the difference between the 265 and 275.
Here are the results for thread block width in mm 265/35R19 (Total thread width 254mm) 47+32+32+32+47 = 191 (75%) 275/35R19 (Total thread width 259mm) 58+38+38+38+58 = 230 (89%) So even if the 275 total contact patch width is only 5mm wider than the 265 contact patch, it offers 39mm more rubber contacting the road because of the narrower grooves. This is 20% more. This could justify the 2.9lb of extra weight (+12%). Decisions, decisions... Last edited by CanAutM3; 06-02-2013 at 07:43 PM.. |
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06-02-2013, 03:37 PM | #26 | |
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06-04-2013, 07:47 AM | #27 | |
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I'm going to stick with 265 for one more round, as my front (245 ) are still new. Then I might go with 255/275 afterall.
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06-10-2013, 11:03 PM | #28 | |
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We had a wet track day this past Saturday and those PSS are really great in the wet. I was passing all types of 4WD cars |
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06-25-2013, 10:51 AM | #29 |
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Even though the 275s are not much wider, you need to look at the thread pattern, the 275s have smaller grooves and much more rubber touching the ground.
I'll see if I can dig up the pic and post it here also, it was in another thread. |
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06-25-2013, 11:03 AM | #30 | |
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See post #25 in this thread. Thanks anyway |
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06-25-2013, 06:42 PM | #32 |
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Some more food for thought:
1. The wheel widths have a significant impact on the width of the actual contact patch. A stretched tire will allow for maximum contact patch, however too stretched will upset the tires ability to properly handle lateral loads. 2. Too narrow a wheel obviously causing bowing resulting in a reduced contact patch. 3. Tire weight is more important with the front tires than the rear. The fronts are involved in steering and take the bigger initial hit over bumps, etc. Hence you will feel the extra rotaional mass more with the fronts than the rear. That's not to say the rear weight is not a factor at all, just not as much as the fronts. 4. 245/265 is really optimal on the 8.5/9.5 set-up that the M3 comes with. Honestly I am surprised they didn't move to a 255/275 set-up with the ZCP package. The extra 0.5" wheel width makes the 359 wheels perfectly suited to take 255/275. At stock offset, there is also no rubbing with 255 on the ZCP wheel.
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06-26-2013, 09:32 AM | #33 | |||
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I cannot really comment on the fact that unsprung weight has less impact in the rear, I am not enough of an expert in suspension design. However, increasing rotational inertia front or rear has the same detrimental impact on acceleration and braking. Quote:
I agree that BMW could have gone with a 255/275 combo for the ZCP wheels. They may have decided to stay with the 245/265 for comercial/logistics reasons Last edited by CanAutM3; 06-26-2013 at 09:37 AM.. |
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06-26-2013, 10:05 AM | #34 |
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I almost did the 255/40-18 and 265/40-18 but decided I'd rather save the $50. If there was a 275/40-18 PSS I definitely would have done it, but alas
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