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Old 06-12-2008, 01:43 AM   #1
jlam86
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Default 235/40/18 or 235/35/18?

Hello everyone,

I'm in the market for tires and i can't really decide which size tire to get, the 40 series or the 35. The 35 seems to be the closest in diameter when converting from the stock 16'' wrx wheels to 18s. I don't want it throwing the speedo off, well, atleast keep it as close as possible. Do people go with the 40 for added comfort?

Guess my question is, why are so many people getting the 40 series when the 35 is the closest in terms of diameter?

tia
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Old 06-12-2008, 07:43 AM   #2
SimonJ
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35 series is pretty skinny. I'd go for the 40.

Use this to see how your speedo is affected.
http://www.miata.net/garage/tirecalc.html
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Old 06-12-2008, 08:44 AM   #3
waktasz
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Either tire puts the speedo off by about 2% in one direction or the other.
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Old 06-12-2008, 10:08 AM   #4
Imprezha
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Isn't our speedo a few miles fast at 60 mph? Go with the 235/40/18 and you may be closer to correct speeds.
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Old 06-12-2008, 10:56 AM   #5
Turbo_Mike
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Depends on how low your car is... mine rubs with 40s and not with 35's....

If you dont have a fittment issue, the 40s ride a lot better and handle potholes and bumps a lot better as well.
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Old 06-12-2008, 11:08 AM   #6
waktasz
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On a 235? Low offset wheels, super slammed suspension or both?
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Old 06-12-2008, 01:06 PM   #7
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Quote:
Originally Posted by Turbo_Mike View Post
Depends on how low your car is... mine rubs with 40s and not with 35's....

If you dont have a fittment issue, the 40s ride a lot better and handle potholes and bumps a lot better as well.
Quote:
Originally Posted by waktasz View Post
On a 235? Low offset wheels, super slammed suspension or both?
+1. it's gotta be both to be rubbing with 235/40/18s.

to the op, 235/40/18 is a good size to go with.
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Old 06-12-2008, 08:44 PM   #8
jlam86
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i have 40s right now but they came with my wheels and are due for replacement. My car is lowered just a bit so I have no rub issues at all. So i guess the 40 is the way to go. Thanx guys.
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Old 06-12-2008, 08:59 PM   #9
subaru3169
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Quote:
Originally Posted by waktasz View Post
On a 235? Low offset wheels, super slammed suspension or both?
i rub on 235s too.. but i'm on 235/45, and i have 17in wheels.. i have no idea wtf to do.. my rear fenders are already cut
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Old 06-12-2008, 09:54 PM   #10
NOboostSUBIE
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Quote:
Originally Posted by Turbo_Mike View Post
Depends on how low your car is... mine rubs with 40s and not with 35's....

If you dont have a fittment issue, the 40s ride a lot better and handle potholes and bumps a lot better as well.
is this a sedan? what offset are your wheels? are you on springs or coils? I'll be putting 235/40/18's on my bugeye sedan on 18x8 +48 in the next week and I should not need any type of fender work.
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Old 06-12-2008, 10:04 PM   #11
gunnz
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i would run the 40's on my car.
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Old 06-12-2008, 10:41 PM   #12
grippy monkey
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Quote:
Originally Posted by subaru3169 View Post
i rub on 235s too.. but i'm on 235/45, and i have 17in wheels.. i have no idea wtf to do.. my rear fenders are already cut

you need camber... unless you are really rubbing on the inside of the strut
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Old 06-12-2008, 10:50 PM   #13
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Quote:
Originally Posted by grippy monkey View Post
you need camber... unless you are really rubbing on the inside of the strut
i just got my car aligned yesterday.. went to westend if you know darin, but my camber is pretty much the way it is.. last time i heard was on the way home from getting the alignment done, but it didn't sound like the outside.. sounded like the inside, but i wasn't paying attention.. next time i drive my car, i'll have to pay attention and see.. i'll be getting more of my rears cut probably tomorrow anyway
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