Widest tire on 18x8.5" OEM rear wheels?

AKG · 02-02-2012, 06:25 PM

Will 275/35 18 rear tire fit OK ?

Thanks!

Stucks · 02-02-2012, 08:14 PM

Quote:

Originally Posted by AllydNYC

275 will NOT fit on 18x8.5 by any means.

For a 18x8.5 the best tire size is a 235. You can put a 245 on it but it might look a little bit too big.

Stock 335i tire size on sport package cars for the rear 18x8.5 wheels is 255/35/18...

I'd say you could possibly get away with a 265 size on the rears.

AllydNYC · 02-02-2012, 09:59 PM

Quote:

Originally Posted by Stucks

Stock 335i tire size on sport package cars for the rear 18x8.5 wheels is 255/35/18...

I'd say you could possibly get away with a 265 size on the rears.

I was thinking something else... my bad.

AKG · 02-02-2012, 11:18 PM

it is sport package so has 255/35 18, so 275/35 is not that far...

jon328i · 02-02-2012, 11:29 PM

Quote:

Originally Posted by AKG

Will 275/35 18 rear tire fit OK ?

Thanks!

275's too wide for 8.5 width wheels, you need at least 9.5 width wheels.

will.c · 02-03-2012, 12:05 AM

265/35/18 works. But it may depend on tire. I have Hankook V12s

imperial sloth · 02-03-2012, 01:52 PM

I run a 265/35/18 on the oem 189... Its Michelin Pilot SS which runs a little wide/square... fits well

ALUFELGEN · 02-03-2012, 02:35 PM

Quote:

Originally Posted by AKG

Will 275/35 18 rear tire fit OK ?

Thanks!

We would recommend a 255/35/18 for a stock 8.5" OEM. A 265/35 or a 275/35 would be too wide for would cause "tire flex" and loose of steering feel with the road. Your suspension dynamics will be completely different.

Gimmethecash · 02-03-2012, 02:37 PM

I ran 255/35/18 PSS on my stock 287's (8.5") and it looked pudgy to me. Same tire looks "right" on an 18x9.5.

255 is the max width recommended (by any tire manufacturer I've seen) for an 8.5" rim.

335iSSA · 02-03-2012, 06:56 PM

May depend on the tire but the tirerack web site gives spec, including rim with range, for each tire. An example is the Pilot Super Sport lists the widest tire for a 8.5 inch wide rim as 255.

remmib · 02-04-2012, 06:28 AM

I'd wouldn't fit 275/35 on 18x8.5.

213e90n51 · 04-29-2020, 09:47 PM

Quote:

Originally Posted by imperial sloth

I run a 265/35/18 on the oem 189... Its Michelin Pilot SS which runs a little wide/square... fits well

How does it look like? Do you have a lci e90 and does it rub And its 8.5 right?

Emilime75 · 04-29-2020, 10:12 PM

Technically, according to wheel/tire sizing charts, even the stock 255 is too wide for an 8.5" wheel. Most charts I've seen say a 245 is the max for 8.5". 275 requires a 10-10.5" wheel, again, according to charts.

Obviously people have deviated from that, including BMW, and it's worked fine. I have 275/30/19 PS4S on 10" wheels and they are slightly stretched, nothing drastic. On a wheel that's 1.5" narrower, I'd imagine they'd look a little bulgy.

thormessiah · 04-29-2020, 10:35 PM

Quote:

Originally Posted by Stucks

Stock 335i tire size on sport package cars for the rear 18x8.5 wheels is 255/35/18...

I'd say you could possibly get away with a 265 size on the rears.

I squeezed in a 265 before I moved up to wider rims and a 275. I remember the shop that did it said they could barely get them on lol. Tires also tend to vary by brand so some might be bigger than others

SanNico335i · 05-01-2020, 08:39 PM

245/40 18 are max spec for 8.5 and look right. I would recommend 235/40. Unless your running 300+ ft lbs at the wheel, a 235 or 245 is plenty of tire.

Hell, even the new G20 M340i running 225. Grip should be plenty .

Kaz26 · 11-01-2022, 10:32 AM

I bought 2008 335i e90 in 2016 with 162 rims (8x18” in front, 8.5x18” in rear) and the previous owner managed to squeeze on Michelin PSS size 275/35zr18 in the rear and 235/40zr18 in the front. So it is possible to fit 275’s on an 8.5” rim.

R3dLeader · 12-07-2022, 04:44 PM

Quote:

Originally Posted by AKG

Will 275/35 18 rear tire fit OK ?

Thanks!

Quote:

Originally Posted by AKG

it is sport package so has 255/35 18, so 275/35 is not that far...

No, it will not fit ok. Well actually it will fit, but it will drive like crap. No sidewall support. Don't do this. Especially considering most summer tires run at the wider range of the size class compared to the stock tire.

For example a stock Bridgestone 255 is a lot narrower than a PSS 255. Use Tire Rack to compare the 'tread width' spec for the stock tire and the ones you are looking to use.

Quote:

Originally Posted by Kaz26

I bought 2008 335i e90 in 2016 with 162 rims (8x18” in front, 8.5x18” in rear) and the previous owner managed to squeeze on Michelin PSS size 275/35zr18 in the rear and 235/40zr18 in the front. So it is possible to fit 275’s on an 8.5” rim.

275 PSS on an 8.5 rim is ridiculous. I'd like to see how it looks, do you have pics? PSS is wider than other brands.

Mavus · 12-07-2022, 08:59 PM

Quote:

Originally Posted by Kaz26

I bought 2008 335i e90 in 2016 with 162 rims (8x18" in front, 8.5x18" in rear) and the previous owner managed to squeeze on Michelin PSS size 275/35zr18 in the rear and 235/40zr18 in the front. So it is possible to fit 275's on an 8.5" rim.

I consider 275 on 8.5 rim unsafe. Not sure why anybody would do it including the shop.

rbryantaz · 12-09-2022, 01:22 PM

+1 on what R3dLeader said...

Looking at the tire specs is the way to determine what is right.

Not all tires have the same width. Note that as aspect ratio is higher you can get a wider tire on a narrower rim because the tire has more room to flex. It also does change the tire diameter slightly if you run a narrower rim (but not much due to the steel belt).

The michelin PS4 does allow for a 255/40/18 on a 8.5" rim (note the rim width range). Meas rim width is the width they spec the overall diameter at.

Name: Michelin ps4 255-40-18 specs.JPG
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Name: Michelin ps4 255-40-18 specs.JPG
Views: 4805
Size: 36.0 KB

https://www.tirerack.com/tires/tires...4SXL&tab=Sizes

-Rich

02-02-2012, 06:25 PM	#1
AKG Enlisted Member 9 Rep 31 Posts Drives: BMW 335i Sedan Join Date: Jul 2011 Location: Guatemala iTrader: (0)	Widest tire on 18x8.5" OEM rear wheels? Will 275/35 18 rear tire fit OK ? Thanks! __________________ Mods: JB4 G5 / Dinan Stage 2, Intake, AFE scoops, DP´s, Dinan oil cooler.
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02-02-2012, 11:18 PM	#4
AKG Enlisted Member 9 Rep 31 Posts Drives: BMW 335i Sedan Join Date: Jul 2011 Location: Guatemala iTrader: (0)	it is sport package so has 255/35 18, so 275/35 is not that far... __________________ Mods: JB4 G5 / Dinan Stage 2, Intake, AFE scoops, DP´s, Dinan oil cooler.
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02-03-2012, 12:05 AM	#6
will.c Captain 128 Rep 638 Posts Drives: E46M Join Date: Mar 2011 Location: Central Jersey iTrader: (5)	265/35/18 works. But it may depend on tire. I have Hankook V12s
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02-03-2012, 01:52 PM	#7
imperial sloth witty quote 28 Rep 273 Posts Drives: 2010 space grey e92 Join Date: Mar 2011 Location: Houston, TX iTrader: (5)	I run a 265/35/18 on the oem 189... Its Michelin Pilot SS which runs a little wide/square... fits well
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02-03-2012, 02:37 PM	#9
Gimmethecash Lieutenant 150 Rep 485 Posts Drives: F90 M5 Comp Join Date: Mar 2011 Location: Pasadena iTrader: (1)	I ran 255/35/18 PSS on my stock 287's (8.5") and it looked pudgy to me. Same tire looks "right" on an 18x9.5. 255 is the max width recommended (by any tire manufacturer I've seen) for an 8.5" rim.
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02-03-2012, 06:56 PM	#10
335iSSA Captain 15 Rep 603 Posts Drives: 07' E92 335i Join Date: Nov 2009 Location: Frederick, MD iTrader: (10)	May depend on the tire but the tirerack web site gives spec, including rim with range, for each tire. An example is the Pilot Super Sport lists the widest tire for a 8.5 inch wide rim as 255.
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02-04-2012, 06:28 AM	#11
remmib General 1569 Rep 29,202 Posts Drives: 2013 F10 520d M-Sport Join Date: Feb 2006 Location: Norway iTrader: (0)	I'd wouldn't fit 275/35 on 18x8.5. __________________ F10 520d M-Sport Alpine White \| HRE P43SC 20x9+20x11 \| Michelin PSS 255/35+295/30 \| KW V3 Coilover \| M5 Front Sway Bar + M550d Rear Sway Bar \| 3DDesign Front Lip \| BMW M Performance CF Spoiler \| BMW M Performance Diffuser \| BMW M Performance Black Grills \| BMW M Performance Pedals \|
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04-29-2020, 10:12 PM	#13
Emilime75 Colonel 1209 Rep 2,476 Posts Drives: 2010 335i E92 LeMans Blue Join Date: Dec 2017 Location: Merica! iTrader: (1)	Technically, according to wheel/tire sizing charts, even the stock 255 is too wide for an 8.5" wheel. Most charts I've seen say a 245 is the max for 8.5". 275 requires a 10-10.5" wheel, again, according to charts. Obviously people have deviated from that, including BMW, and it's worked fine. I have 275/30/19 PS4S on 10" wheels and they are slightly stretched, nothing drastic. On a wheel that's 1.5" narrower, I'd imagine they'd look a little bulgy.
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05-01-2020, 08:39 PM	#15
SanNico335i New Member 6 Rep 11 Posts Drives: 2013 E92 335i Join Date: Oct 2019 Location: Madison, WI iTrader: (0)	245/40 18 are max spec for 8.5 and look right. I would recommend 235/40. Unless your running 300+ ft lbs at the wheel, a 235 or 245 is plenty of tire. Hell, even the new G20 M340i running 225. Grip should be plenty .
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11-01-2022, 10:32 AM	#16
Kaz26 Second Lieutenant 34 Rep 295 Posts Drives: 2008 335i Alpinweiß Sedan Join Date: Sep 2017 Location: Los Angeles iTrader: (0)	I bought 2008 335i e90 in 2016 with 162 rims (8x18” in front, 8.5x18” in rear) and the previous owner managed to squeeze on Michelin PSS size 275/35zr18 in the rear and 235/40zr18 in the front. So it is possible to fit 275’s on an 8.5” rim.
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12-09-2022, 01:22 PM	#19
rbryantaz Lieutenant 372 Rep 531 Posts Drives: 2007 E70 4.8i, 2008 E90 335i Join Date: Jul 2015 Location: Phoenix, AZ area iTrader: (4) Garage List 2008 BMW 335i [7.67] 2007 BMW X5 4.8i [10.00]	+1 on what R3dLeader said... Looking at the tire specs is the way to determine what is right. Not all tires have the same width. Note that as aspect ratio is higher you can get a wider tire on a narrower rim because the tire has more room to flex. It also does change the tire diameter slightly if you run a narrower rim (but not much due to the steel belt). The michelin PS4 does allow for a 255/40/18 on a 8.5" rim (note the rim width range). Meas rim width is the width they spec the overall diameter at. https://www.tirerack.com/tires/tires...4SXL&tab=Sizes -Rich __________________ 2007 E70 X5 4.8i with 10" android screen Running 265/60/18 AT34s All Terrains (Mainly for road trips) 2008 E90 335i with 10" android screen, 7" intercooler, inlets, Dinan intake, JB4 BEF, E85 conversion, Mfactory LSD, M3 suspension, EDC shocks with custom controller. Last edited by rbryantaz; 12-09-2022 at 01:29 PM..
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