Tires for 8.5" rim

xtascox · 05-31-2011, 01:10 PM

For my stock height 325XI:

I'm picking up some TRMotorsports C2 17x8.5's and I'm trying to figure out the best tire size. I'm looking at 225/45/17, 245/40/17, and 255/40/17. The overall diameter of the 255/40/17 seems to be closest to stock but I'm not sure if 255 will rub. I know 225's will fit fine but I'm not a fan of the stretched look and I don't know how stretched (if at all) a 225 would be on an 8.5" rim.

Any thoughts? I searched but couldn't find anything relevant to my sizes and the XI's.

xtascox · 05-31-2011, 01:26 PM

Searched some more, seems 255 fits fine on the back. Will they fit the front fine also?

EDIT: Just ordered 245/40/17.

Kubica · 05-31-2011, 02:43 PM

I would have gone with a 235 width. What are the offsets of the wheels? What brand/model tires?

I probably couldn't fit a 245/40/18 with ET38 up front, depending on brand/model. I have 235/40/18 star specs and there's maybe 5mm between the tire and strut.

xtascox · 05-31-2011, 02:50 PM

Quote:

Originally Posted by Kubica

I would have gone with a 235 width. What are the offsets of the wheels? What brand/model tires?

I probably couldn't fit a 245/40/18 with ET38 up front, depending on brand/model. I have 235/40/18 star specs and there's maybe 5mm between the tire and strut.

+40mm offset
Hankook Ventus V4

Kubica · 05-31-2011, 02:54 PM

^It's gonna be close! I'm not sure how wide the hankooks are. May need spacers up there.

xtascox · 05-31-2011, 02:59 PM

Quote:

Originally Posted by Kubica

^It's gonna be close! I'm not sure how wide the hankooks are. May need spacers up there.

If it were to rub would it be while turning the wheel very far or all the time?

Kubica · 05-31-2011, 05:01 PM

Quote:

Originally Posted by xtascox

If it were to rub would it be while turning the wheel very far or all the time?

I think it would hit the strut- wouldn't be rubbing per se. It would just be too wide to be mounted.

wdeerfield · 05-31-2011, 05:06 PM

yea 5mm spacers would be required up front.

xtascox · 06-01-2011, 11:56 AM

Well we'll find out. The shop I ordered from said he researched it and that they would fit so it's on him if they don't. Thanks guys.

xtascox · 06-01-2011, 11:58 AM

Would 5mm spacers work with stock lugs?

Does the XI front have less clearance than non-XI? I talked to a member on here with the same wheels and 255/40-17's and he had no clearance issues on stock sport suspension. Given the XI sits higher that a non-sport non-xi, wouldn't one guess they should clear no problem.

xtascox · 06-13-2011, 01:51 PM

Just thought I'd update and tell you guys that everything fit no problem. 245/40-17 on TRMotorsports C2's.

wdeerfield · 06-14-2011, 07:53 AM

Good to know! Thanks for updating the thread with the results. Im thinking of going to a 245 next on my 18s, i think with an 18 id need spacers though with an et40

Kubica · 06-14-2011, 11:11 AM

^dunno if 17 vs. 18 will make a difference.

A lot has to do with the tire brand/model. Not all 245 tires would fit with ET40 wheels.

xtascox · 06-14-2011, 03:00 PM

Quote:

Originally Posted by Kubica

^dunno if 17 vs. 18 will make a difference.

A lot has to do with the tire brand/model. Not all 245 tires would fit with ET40 wheels.

17" for the record. And yes, it is a little tighter in the front but most of the extra width came towards the outside of the car.

wdeerfield · 06-14-2011, 03:04 PM

Quote:

Originally Posted by xtascox

17" for the record. And yes, it is a little tighter in the front but most of the extra width came towards the outside of the car.

huh? did they mount it centered on the rim?

xtascox · 06-14-2011, 03:16 PM

Quote:

Originally Posted by wdeerfield

huh? did they mount it centered on the rim?

Sorry, I wasn't clear. The extra width (I went from 7.5" to 8.5" rims) from the wheel came out away from the car.

05-31-2011, 01:10 PM	#1
xtascox Registered User Join Date: Aug 2010 Location: Philadelphia Posts: 135 My Ride: 325xi View My Garage	Tires for 8.5" rim For my stock height 325XI: I'm picking up some TRMotorsports C2 17x8.5's and I'm trying to figure out the best tire size. I'm looking at 225/45/17, 245/40/17, and 255/40/17. The overall diameter of the 255/40/17 seems to be closest to stock but I'm not sure if 255 will rub. I know 225's will fit fine but I'm not a fan of the stretched look and I don't know how stretched (if at all) a 225 would be on an 8.5" rim. Any thoughts? I searched but couldn't find anything relevant to my sizes and the XI's.

05-31-2011, 01:26 PM	#2
xtascox Registered User Join Date: Aug 2010 Location: Philadelphia Posts: 135 My Ride: 325xi View My Garage	Searched some more, seems 255 fits fine on the back. Will they fit the front fine also? EDIT: Just ordered 245/40/17. Last edited by xtascox; 05-31-2011 at 01:38 PM.

05-31-2011, 05:06 PM	#8
wdeerfield Registered User Join Date: Jan 2008 Location: Clifton Park, New York Posts: 3,254 My Ride: 2009 328i xdrive View My Garage	yea 5mm spacers would be required up front. __________________ 2009 MBM \| ZPP \| ZSP \| ZCW \| CA \| 6FL \| NAV \| XENONS \| 18x8.5 VB3s ET30/25

06-01-2011, 11:58 AM	#10
xtascox Registered User Join Date: Aug 2010 Location: Philadelphia Posts: 135 My Ride: 325xi View My Garage	Would 5mm spacers work with stock lugs? Does the XI front have less clearance than non-XI? I talked to a member on here with the same wheels and 255/40-17's and he had no clearance issues on stock sport suspension. Given the XI sits higher that a non-sport non-xi, wouldn't one guess they should clear no problem. Last edited by xtascox; 06-01-2011 at 12:52 PM.

06-14-2011, 07:53 AM	#12
wdeerfield Registered User Join Date: Jan 2008 Location: Clifton Park, New York Posts: 3,254 My Ride: 2009 328i xdrive View My Garage	Good to know! Thanks for updating the thread with the results. Im thinking of going to a 245 next on my 18s, i think with an 18 id need spacers though with an et40 __________________ 2009 MBM \| ZPP \| ZSP \| ZCW \| CA \| 6FL \| NAV \| XENONS \| 18x8.5 VB3s ET30/25

05-31-2011, 02:43 PM	#3
Kubica Registered User Join Date: Apr 2008 Location: Boston Posts: 3,951 My Ride: 2003 325xi View My Garage	I would have gone with a 235 width. What are the offsets of the wheels? What brand/model tires? I probably couldn't fit a 245/40/18 with ET38 up front, depending on brand/model. I have 235/40/18 star specs and there's maybe 5mm between the tire and strut.

05-31-2011, 02:54 PM	#5
Kubica Registered User Join Date: Apr 2008 Location: Boston Posts: 3,951 My Ride: 2003 325xi View My Garage	^It's gonna be close! I'm not sure how wide the hankooks are. May need spacers up there.

06-01-2011, 11:56 AM	#9
xtascox Registered User Join Date: Aug 2010 Location: Philadelphia Posts: 135 My Ride: 325xi View My Garage	Well we'll find out. The shop I ordered from said he researched it and that they would fit so it's on him if they don't. Thanks guys.

06-13-2011, 01:51 PM	#11
xtascox Registered User Join Date: Aug 2010 Location: Philadelphia Posts: 135 My Ride: 325xi View My Garage	Just thought I'd update and tell you guys that everything fit no problem. 245/40-17 on TRMotorsports C2's.

06-14-2011, 11:11 AM	#13
Kubica Registered User Join Date: Apr 2008 Location: Boston Posts: 3,951 My Ride: 2003 325xi View My Garage	^dunno if 17 vs. 18 will make a difference. A lot has to do with the tire brand/model. Not all 245 tires would fit with ET40 wheels.

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