Overall Wheel Diameter Effect on AWD

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Mr.Pessimist
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Overall Wheel Diameter Effect on AWD

Post by Mr.Pessimist » Wed Sep 04, 2019 9:37 pm

I'm looking into buying studless snow tires for my wife's 2010 Tribeca.

Stock tire size: 255/55 R18
Snow tire size: 235/55 R18 (I cant get these for an insanely good price)

Overall diameter change: 0.8"

How will this change affect her car?

I'll also be buying a fifth one of these as her spare during winter months (avoiding different tire make/model/size issues on AWD if the spare is needed).
~Ross
1993 FWD 5MT Green NA Legacy

Mr.Pessimist
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Re: Overall Wheel Diameter Effect on AWD

Post by Mr.Pessimist » Fri Sep 06, 2019 12:38 am

I've done some digging while waiting for a reply...

Very good tire comparison tool: https://tiresize.com/comparison/

This site, and other places I've read, say that +/- 3% of OEM diameter is acceptable.
~Ross
1993 FWD 5MT Green NA Legacy

Legacy777
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Re: Overall Wheel Diameter Effect on AWD

Post by Legacy777 » Mon Sep 16, 2019 5:40 pm

As long as you keep all the tires the same it shouldn't matter much.
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

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