255/xx/17 tire sizes? What aspect ratio?
255/xx/17 tire sizes? What aspect ratio?
Hi guys.
Apparently tire companies don't make 255/35/17? Should I go with 255/30/17 or 255/40/17? The miata tire sizing calculator (http://www.eunos.com/tirecalc/) says the 30s will have almost the same outer diameter as the stockers but I don't know if I want the same outer diameter as my dinky 185/60/14 wheels.
Thanks,
Victor
Apparently tire companies don't make 255/35/17? Should I go with 255/30/17 or 255/40/17? The miata tire sizing calculator (http://www.eunos.com/tirecalc/) says the 30s will have almost the same outer diameter as the stockers but I don't know if I want the same outer diameter as my dinky 185/60/14 wheels.

Thanks,
Victor
255/40r17 is about perfect. Thats what I run in the rear, and will be running on all 4 in the future with my new fender and wheel setup. The 255/40r17 is .3" smaller in diameter than the stock 205/60r15s on 15" wheel equipped FCs.
Originally Posted by $150FC
The miata tire sizing calculator (http://www.eunos.com/tirecalc/) says the 30s will have almost the same outer diameter as the stockers but I don't know if I want the same outer diameter as my dinky 185/60/14 wheels. 
Thanks,
Victor

Thanks,
Victor
So, as the above poster said, 255/40 17 is correct (I don't know FCs, so you might have to run 245/40 17 for clearance, which is also ok).
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