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Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack Specific topics relating to wheels and tires.


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Old 02-05-2020, 08:44 PM   #1
staybrzy
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Talking Tire size?

I got 18x8+45 wheels and am not sure if I should run 225/35/18, 225/40/18, or 235/40/18. I want to run 235s but am not sure if It'd be too large a speedo error. Thoughts?
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Old 02-05-2020, 09:00 PM   #2
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Definitely go for the 225/40. The 235 is an option, but itís a bit too tall if you ask me. 225/40 is perfect for the 8 inch wide wheel
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Old 02-05-2020, 09:01 PM   #3
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Speedo error would be ~3.1km/hr on 235/40/18.

100km/hr= 103.1km/hr with those.
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Old 02-05-2020, 09:10 PM   #4
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Definitely go for the 225/40. The 235 is an option, but it’s a bit too tall if you ask me. 225/40 is perfect for the 8 inch wide wheel
Isn't height the (40)? So you're saying the wheel will be taller at 235 width as opposed to 225? Also, should I go 225/40 or 225/35?
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Old 02-05-2020, 09:29 PM   #5
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Isn't height the (40)? So you're saying the wheel will be taller at 235 width as opposed to 225? Also, should I go 225/40 or 225/35?
It's aspect ratio, not height, it varies with width, a 215/45/17 is the same diameter as a 245/40/17.
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Old 02-05-2020, 09:31 PM   #6
Will BRZ
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Isn't height the (40)? So you're saying the wheel will be taller at 235 width as opposed to 225? Also, should I go 225/40 or 225/35?
225/40/18 is a very common size. Youíll be able to find a good variety of tires for good prices. That size is under a 2% difference from stock and the speedometer will be about like 1.14mph under your actual speed I think. 235/40 is a 3.2% difference and the speedo will be almost 2mph under. Iíve seen people even running 215 on an 8 inch wheel too, but itís up to you. Iíd just take the 225/40/18. Itíll look good on the wheel, youíll save some money, and itíll be lighter than the thicker tire
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