View Single Post
      06-04-2013, 07:47 AM   #27
W///
Lieutenant General
W///'s Avatar
7433
Rep
12,291
Posts

Drives: F82GTS, E36/E92M3, Z4M
Join Date: Sep 2011
Location: SC

iTrader: (13)

Quote:
Originally Posted by CanAutM3 View Post
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...
Ok now we are talking. ~20% for 3 lbs is something I can deal with. Thanks for the heads up and let us know what you decide to go with.

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.
__________________
Current:
16 F82 M4 GTS, Black Sapphire/Black, DCT
08 E92 M3, Sparkling Graphite/Bamboo Beige, 6MT
07 E85 Z4M Roadster, Alpine White/Red, 6MT
99 E36 M3, Techno Violet/Dove Grey, 6MT
Appreciate 0