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      04-18-2009, 07:06 PM   #1
fourtailpipes
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235/40-18 on oem front wheel fits

http://www.1addicts.com/forums/showthread.php?t=252882

in case anyone wants wide tires without shelling out for wheels...

based on my results, 245 will likely work too. there's still a fair amount of space toward the strut, and the wheel doesn't seem too narrow to go up even one more size. definitely out of spec, but may be useful in the track arena. i didn't use a spacer, and there's ample fender space as well.

i used 255/40-18 on my oem m3 front wheels (18x8) with no adverse effects, so 245 on a 7.5 should be quite similar.
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      04-20-2009, 11:00 AM   #2
JME
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I'm running 245/35/18 Kumho V710s on the front with a 5 mm spacer. No fitment issues at all. The tires look extremely wide for the wheel, though.
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      04-20-2009, 07:34 PM   #3
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Quote:
Originally Posted by JME View Post
I'm running 245/35/18 Kumho V710s on the front with a 5 mm spacer. No fitment issues at all. The tires look extremely wide for the wheel, though.
I bet they do. On my E36, I'm using those tires on an 18x9 BBS RCJ, and that looks about right. Good to hear you can squeeze them on the 7.5" wide wheels.

Chris
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      04-20-2009, 10:32 PM   #4
bestsw20
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JME, what rims are you using with your front tires? I am looking for something like that too. and the rear? what size are you using?
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      04-21-2009, 01:24 PM   #5
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These are on the stock wheels :D

I have 245/35/18 Kumho V710's on all four corners with a 5mm spacer up front. The Kumhos run very wide, so the spacer was necessary. If you were running on the GTS-rs you would only be able to run a 2mm spacer and still be in stock class since the GTS-r already has a 4mm more aggressive offset than the stock wheels.

This is strictly for autocross, and I do not recommend that tire size on the street. One thing I have learned over the years is that two different brand of tires with the same size might have very different actual dimensions. The 245 width Kumhos on my 8.5" stock wheels are actually wider than the 255 width General UHPs on my 8.5" Breytons. I laid them both on my basement floor and the difference was quite obvious and dramatic. If you do decide to go with this size tire I would suggest NOT taking it to your local tire shop to get mounted. Getting a tire that wide on a narrow wheel is a pain, many shops won't do it.

It could be that a 245 width tire of a different brand and/or model will fit better on the front wheels, but I highly doubt anything wider than 235 will be acceptable for street use on this wheel.

Of course, back in the day I had 255/60/15 tires on the back of my 71 mustang..... on a 15 x 7 wheel and they fit just fine. Had 235/60/15's on the front and MAN did that thing look mean. I doubt that the same brand in a 255/35 would fit quite as well :D

I have Breyton GTS-r wheels with General UHPs in 225/40/18 and 255/35/18 for street comfort. Unless you plan on tracking with your street tires, I highly recommend these tires for ride quality and stick to dedicated track tires on different wheels.

I'll take some pictures of the wheels/tires off and on the car this weekend while I am prepping for an autocross.
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      04-22-2009, 12:31 PM   #6
adc
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Why not 235/265? Do you think a 265 won't fit on in the rear?

That's what I have on my 335i right now and I love them.
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      04-22-2009, 01:04 PM   #7
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Quote:
Originally Posted by adc View Post
Why not 235/265? Do you think a 265 won't fit on in the rear?

That's what I have on my 335i right now and I love them.
Kumhos currently do not come in those sizes.
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      04-22-2009, 01:34 PM   #8
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Quote:
Originally Posted by JME View Post
Kumhos currently do not come in those sizes.
Ah, I see. I'm running Pirelli PZero Nero M+S.
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      04-23-2009, 12:07 PM   #9
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I have 225/255 on the oem wheels, you can put 235/265 if you want, but since the tires have to be rolled in to fit, you get less contact patch with the road which means less grip. I am talking about street tires (Falken RT615). Some may work better than others but It's all up to the driver. The guy at the tire place was nice enough to put a 245 up front for me to see and it just did not look right at all, it looked way to big for the wheel. Now if I was driving a civic hatch then that would've been totally cool and all for the friday night drags...........JK, never been a fan of drag racing.
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      05-03-2009, 09:05 PM   #10
fourtailpipes
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Quote:
Originally Posted by Morock'N View Post
I have 225/255 on the oem wheels, you can put 235/265 if you want, but since the tires have to be rolled in to fit, you get less contact patch with the road which means less grip. I am talking about street tires (Falken RT615). Some may work better than others but It's all up to the driver. The guy at the tire place was nice enough to put a 245 up front for me to see and it just did not look right at all, it looked way to big for the wheel. Now if I was driving a civic hatch then that would've been totally cool and all for the friday night drags...........JK, never been a fan of drag racing.
area of contact patch is a factor of tire pressure and car weight. tire size only dictates the shape of this contact patch.

for example, 40psi means the tire will hold 40 pounds of car weight per square inch of contact patch. if your car weighs 3200 lbs and has perfect weight distribution, you car weighs 800 lbs per corner, and will have a contact patch of 20 square inches per corner. (800/40 = 20) this area would be reduced by any weight the tire itself supports, a constant which would be relatively unaffected by tire size.
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