Grip increase from running wider (255/275) tires? How much?

sig5x · 02-29-2012, 01:56 PM

I was wondering if anyone had input on how much of an increase (in "g) in grip from switching to slightly wider tires?

It's common to upsize from a 245 fr / 265 rr width to 255/275 or even 255/285.

Assuming the same car, suspension and tire model, how much of a quantifiable gain could this result in?

Aside from the increased rolling resistance and added tire weight, are there any other drawbacks?

Thanks.

OC3 · 02-29-2012, 02:45 PM

Increase in g is exactly 0.1257230829123472395235208

the///Mthree · 02-29-2012, 02:53 PM

255mm is roughly 4% wider than 245mm

Richbot · 02-29-2012, 03:00 PM

1.21 gigawatts

Alex07M3 · 02-29-2012, 03:19 PM

I can't tell you in Gs , but I run 255 and 295 on ZCP wheels and it makes a BIG difference , the rear wheels has a lot more grip in acceleration and in cornering ! As for the extra weight(lost of power) , I don't feel it !

tibra1 · 02-29-2012, 03:20 PM

1.6 Newtons

seriously op..its negligible.. on a street driven car even more so.

Alex07M3 · 02-29-2012, 03:38 PM

The fact that I use AD08 instead of PS2 probably also help !

02-29-2012, 01:56 PM	#1
sig5x Private First Class Drives: e92 ZCP Join Date: Dec 2009 Location: USA Posts: 188 iTrader: (0)	Grip increase from running wider (255/275) tires? How much? I was wondering if anyone had input on how much of an increase (in "g) in grip from switching to slightly wider tires? It's common to upsize from a 245 fr / 265 rr width to 255/275 or even 255/285. Assuming the same car, suspension and tire model, how much of a quantifiable gain could this result in? Aside from the increased rolling resistance and added tire weight, are there any other drawbacks? Thanks. __________________ 2011 e92 M3: AW/blk zcp, dct 2008 Civic Si FG2 ASM/blk 2005 e46 M3: SG/blk zcp, 6MT (sold)
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02-29-2012, 02:45 PM	#2
OC3 Havin' a blast! Drives: 2013 M3 E92 Jerez Blk DCT ZCP Join Date: Nov 2010 Location: SoCal Posts: 3,734 iTrader: (0)	Increase in g is exactly 0.1257230829123472395235208 __________________ 2013 E92 M3 Jerez Black DCT ZCP 2011 E90 M3 Jerez Black DCT ZCP (Gone - traded in) 2008 E90 M3 Jerez Black 6MT (Gone - End of Lease)

02-29-2012, 03:00 PM	#4
Richbot Major Drives: Jerez Black E90 Join Date: Sep 2007 Location: STL Posts: 1,487 iTrader: (1)	1.21 gigawatts __________________

02-29-2012, 03:19 PM	#5
Alex07M3 Captain Drives: e92 m3 Join Date: Jan 2012 Location: Gatineau Posts: 943 iTrader: (0) Garage List 2008 e92 M3 [5.00]	I can't tell you in Gs , but I run 255 and 295 on ZCP wheels and it makes a BIG difference , the rear wheels has a lot more grip in acceleration and in cornering ! As for the extra weight(lost of power) , I don't feel it ! __________________ ESS VT1-535, Corsa, Eibach, Yoko AD08s 255/295

02-29-2012, 03:38 PM	#7
Alex07M3 Captain Drives: e92 m3 Join Date: Jan 2012 Location: Gatineau Posts: 943 iTrader: (0) Garage List 2008 e92 M3 [5.00]	The fact that I use AD08 instead of PS2 probably also help ! __________________ ESS VT1-535, Corsa, Eibach, Yoko AD08s 255/295

02-29-2012, 02:53 PM	#3
the///Mthree First Lieutenant Drives: e90 m3 Join Date: Jul 2009 Location: new york Posts: 335 iTrader: (0)	255mm is roughly 4% wider than 245mm

02-29-2012, 03:20 PM	#6
tibra1 Banned Drives: 2011 ZCP M3 - 2007 335i crashd Join Date: Apr 2009 Location: NYC Posts: 6,779 iTrader: (4)	1.6 Newtons seriously op..its negligible.. on a street driven car even more so.

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