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Old 08-31-2019, 11:08 PM   #1
CoronaWRX
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Default 255/35-19 on 2018+ stock STi wheel Issues?

Is anyone running a 255/35-19 on the stock 2018+ 19" STi wheel? If so, any issues. Please post a pic, thanks!
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Old 09-19-2019, 12:46 PM   #2
Norm Peterson
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You might notice that steering response with the 255's is a little 'softer' than with the 245's - assuming that you get the 255's in the same tire mfr and model as the 245's. Ultimate grip may or may not improve, not that you're likely to be able to appreciate the difference in any street driving.

Keep in mind that because a 255/35 tire is measured on a 9" wide wheel that it will only appear to be about 250mm wide when mounted on an 8.5" wide rim. A 245/35 is measured on 8.5", so it looks 245 wide on 8.5". The 255/35's tread with will remain about the same, but that's a harder thing to see . . . let alone compare against the tread width of a 245/35 tire.


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Old 09-20-2019, 12:40 AM   #3
CoronaWRX
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Thanks for the info Norm! Would the sidewalls of a 255 on an 8.5" be taller than a 245 on a 8.5? What I'm really after is a bit more sidewall to help with the horrible roads vs width for performance, but I don't want to deviate too far away from the original tire diameter. Maybe 245/40-19s is a better option? I'll probably have to drop to 18"s and run a taller sidewall.
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Old 09-20-2019, 07:27 AM   #4
Norm Peterson
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Quote:
Originally Posted by CoronaWRX View Post
Thanks for the info Norm! Would the sidewalls of a 255 on an 8.5" be taller than a 245 on a 8.5?
Yes, by about 1/8" (3mm).

As a percentage of "visible" sidewall height, that's about 2.81" vs 2.68" or 5%. Visible sidewall height being taken from the rim flange OD rather than from the bead seat which is what the profile height is referenced to. Flange heights for car wheels are typically about 0.70".

On 245/40-19's, I haven't taken any measurements to see if 1" more on the tire OD is likely to cause anything outside of a minor speedometer/odometer error (60 mph indicated really being a little over 62 mph actual).

For all practical purposes, a 245/40-18 is the same OD as a 245/35-19, and you'd be gaining almost a half inch of visible sidewall height (3.16", 18% more).


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