Another Tire sizing question

mbdurham · 01-03-2007, 10:02 PM

If you use the calculator at the top of this forum the actual optimum setup for 8.5/9.5 seems to be 235/275 yet no one seems to use this. Any Idea why? everyone either goes 245/275 or 235/265.

I think I remember reading a post where someone went with 275 rears and 235 fronts and it was making his traction control kick in. Has anyone else experienced this?

rmorin49 · 01-03-2007, 10:58 PM

I've been advised by 2 tire and wheel vendors to avoid going to a 275 in the rear due to fitment problems and rubbing.

Vinobien · 01-03-2007, 11:02 PM

Good question - the 235/275
tires are the exact same diameter. the other combos are not.

mbdurham · 01-04-2007, 05:13 PM

Yep the 245 are a lot larger but everyone who does 275 rear puts 245 on front. The 235/275 setup increases diameter front and rear almost exactly. And in the rear I understand using the 265with the M3 offsets but normally I would think 275 would be optimum. If someone has experience to the contrary please let me know.

Vinobien · 01-05-2007, 11:54 PM

Where are the e90post brainchilds when you need them?

Carnage · 01-06-2007, 10:33 AM

The story I've always gotten from long time BMW "gurus" is the you don't want to exceed a 30MM stagger between the front and rear or risk messing with the handling dynamics of the car. A 30MM stagger is what BMW normally uses on it's staggered setup regardless of the size of the tires.

It's the same reason why they don't recommend going with a 30MM stagger then adding spacers.

Vinobien · 01-06-2007, 10:40 AM

Good explanation .... I'll ley you know of I can tell a difference. Hopefully I wont be able to tell ... not tracking the car or anything.

Vinobien · 01-06-2007, 11:29 AM

Should I send back the 235s to get 245s since I am running 275s in the rear? Or do you all think I wont be able to tell the difference in handling?

MichaelATL · 01-06-2007, 11:38 AM

crap... im running 235/35 and 265/30... 275/30 actually matches up better... uggh

but the 265s were on sale

that is horrible that my rears will be .2 inches smaller than my fronts *sigh*

mbdurham · 01-06-2007, 03:09 PM

That makes since maybe it would cause understeer. My main concern is if the 245's larger diameter will have any ill effects. The tire I really want to go with Michelin PS All Season which are only available in 245/275. If I use 235/275 or 235/265 I will have to switch to PS2 which is not a bad deal I just would like to use the A/S to keep from having to do a winter setup also.

Carnage · 01-07-2007, 05:45 PM

Quote:

Originally Posted by mbdurham

That makes since maybe it would cause understeer. My main concern is if the 245's larger diameter will have any ill effects. The tire I really want to go with Michelin PS All Season which are only available in 245/275. If I use 235/275 or 235/265 I will have to switch to PS2 which is not a bad deal I just would like to use the A/S to keep from having to do a winter setup also.

Either 245/275 or 235/265 will work fine. I ran 235/265 on the E90 and I'm running 245/275 on the M3. I like the feel of the 245/275 setup better.

Carnage · 01-07-2007, 05:46 PM

Quote:

Originally Posted by Vinobien

Should I send back the 235s to get 245s since I am running 275s in the rear? Or do you all think I wont be able to tell the difference in handling?

You may notice more understeer then normal running 235/275. I would change the 235's to 245's if they weren't mounted already.

01-03-2007, 10:02 PM	#1
mbdurham Commander in Chief 23 Rep 387 Posts Drives: Fast Join Date: Dec 2006 Location: NC iTrader: (0)	Another Tire sizing question If you use the calculator at the top of this forum the actual optimum setup for 8.5/9.5 seems to be 235/275 yet no one seems to use this. Any Idea why? everyone either goes 245/275 or 235/265. I think I remember reading a post where someone went with 275 rears and 235 fronts and it was making his traction control kick in. Has anyone else experienced this? __________________ 07 E90 335i / JET BLACK / TERRA / WALNUT / NAVI / PREMIUM / SPORT / COMFORT ACCESS / HEATED SEATS / SIRIUS / OEM CD CHANGER / OEM LIP SPOILER / OEM AW MATS & CARGO LINER / OEM AL PEDALS / OEM BLACK LINES / OEM JACK KIT / OEM MOBILITY KIT / OEM WHEEL LOCKS / 35% TINT / 19" M6 REPS / 245/275 MICHELIN PILOT SPORT A/S Last edited by mbdurham; 01-04-2007 at 05:14 PM..
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01-03-2007, 10:58 PM	#2
rmorin49 Major 53 Rep 1,162 Posts Drives: 11 335d/10 Z4 s30i Join Date: Nov 2006 Location: Hagerstown, MD iTrader: (1)	I've been advised by 2 tire and wheel vendors to avoid going to a 275 in the rear due to fitment problems and rubbing. __________________ Colonel (Retired), US Army/Hagerstown, MD 2016 518ixdrive/MSport AW/Ivory White ED-01-10 2010 Z4s30i AW/Beige/Burl/ 6MT/SP/PP/CWP/NAV/ipod/USB/CA (retired) 2011 335d BS/Oyster/PP/CWP/NAV/ipod/USB(Daily Driver) 30+ mpg(retired)
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01-03-2007, 11:02 PM	#3
Vinobien The 3 Day Diet! 19 Rep 630 Posts Drives: Space Gray e92, 88 911 Cab Join Date: Sep 2006 Location: Conshohocken, PA iTrader: (0) Garage List 1988 911 Porsche Ca ... [0.00]	Good question - the 235/275 tires are the exact same diameter. the other combos are not.
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01-04-2007, 05:13 PM	#4
mbdurham Commander in Chief 23 Rep 387 Posts Drives: Fast Join Date: Dec 2006 Location: NC iTrader: (0)	Yep the 245 are a lot larger but everyone who does 275 rear puts 245 on front. The 235/275 setup increases diameter front and rear almost exactly. And in the rear I understand using the 265with the M3 offsets but normally I would think 275 would be optimum. If someone has experience to the contrary please let me know. __________________ 07 E90 335i / JET BLACK / TERRA / WALNUT / NAVI / PREMIUM / SPORT / COMFORT ACCESS / HEATED SEATS / SIRIUS / OEM CD CHANGER / OEM LIP SPOILER / OEM AW MATS & CARGO LINER / OEM AL PEDALS / OEM BLACK LINES / OEM JACK KIT / OEM MOBILITY KIT / OEM WHEEL LOCKS / 35% TINT / 19" M6 REPS / 245/275 MICHELIN PILOT SPORT A/S
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01-05-2007, 11:54 PM	#5
Vinobien The 3 Day Diet! 19 Rep 630 Posts Drives: Space Gray e92, 88 911 Cab Join Date: Sep 2006 Location: Conshohocken, PA iTrader: (0) Garage List 1988 911 Porsche Ca ... [0.00]	Where are the e90post brainchilds when you need them?
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01-06-2007, 10:33 AM	#6
Carnage Lieutenant General 341 Rep 16,407 Posts Drives: people insane Join Date: Jun 2005 Location: classified iTrader: (2)	The story I've always gotten from long time BMW "gurus" is the you don't want to exceed a 30MM stagger between the front and rear or risk messing with the handling dynamics of the car. A 30MM stagger is what BMW normally uses on it's staggered setup regardless of the size of the tires. It's the same reason why they don't recommend going with a 30MM stagger then adding spacers.
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01-06-2007, 10:40 AM	#7
Vinobien The 3 Day Diet! 19 Rep 630 Posts Drives: Space Gray e92, 88 911 Cab Join Date: Sep 2006 Location: Conshohocken, PA iTrader: (0) Garage List 1988 911 Porsche Ca ... [0.00]	Good explanation .... I'll ley you know of I can tell a difference. Hopefully I wont be able to tell ... not tracking the car or anything.
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01-06-2007, 11:29 AM	#8
Vinobien The 3 Day Diet! 19 Rep 630 Posts Drives: Space Gray e92, 88 911 Cab Join Date: Sep 2006 Location: Conshohocken, PA iTrader: (0) Garage List 1988 911 Porsche Ca ... [0.00]	Should I send back the 235s to get 245s since I am running 275s in the rear? Or do you all think I wont be able to tell the difference in handling?
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01-06-2007, 11:38 AM	#9
MichaelATL First Lieutenant 25 Rep 306 Posts Drives: E90 335i Join Date: Dec 2006 Location: Atlanta, GA iTrader: (0) Garage List 2007 335i Sedan [0.00]	crap... im running 235/35 and 265/30... 275/30 actually matches up better... uggh but the 265s were on sale that is horrible that my rears will be .2 inches smaller than my fronts sigh
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01-06-2007, 03:09 PM	#10
mbdurham Commander in Chief 23 Rep 387 Posts Drives: Fast Join Date: Dec 2006 Location: NC iTrader: (0)	That makes since maybe it would cause understeer. My main concern is if the 245's larger diameter will have any ill effects. The tire I really want to go with Michelin PS All Season which are only available in 245/275. If I use 235/275 or 235/265 I will have to switch to PS2 which is not a bad deal I just would like to use the A/S to keep from having to do a winter setup also. __________________ 07 E90 335i / JET BLACK / TERRA / WALNUT / NAVI / PREMIUM / SPORT / COMFORT ACCESS / HEATED SEATS / SIRIUS / OEM CD CHANGER / OEM LIP SPOILER / OEM AW MATS & CARGO LINER / OEM AL PEDALS / OEM BLACK LINES / OEM JACK KIT / OEM MOBILITY KIT / OEM WHEEL LOCKS / 35% TINT / 19" M6 REPS / 245/275 MICHELIN PILOT SPORT A/S Last edited by mbdurham; 01-06-2007 at 06:03 PM..
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