Suspension/Wheels/Tires/Brakes

255/xx/17 tire sizes? What aspect ratio?

Old Mar 12, 2005 | 04:56 PM
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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
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Old Mar 12, 2005 | 06:58 PM
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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.
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Old Mar 12, 2005 | 08:55 PM
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rynberg's Avatar
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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
No, you DON'T want the same diameter as you are running the wrong tire size! Base 86 FCs came with 185/70 14 tires, not 185/60s!

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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Old Mar 12, 2005 | 09:08 PM
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http://fc3spro.com/TECH/MODS/RT/tires.htm
Bookmark it bitch!


-Ted
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Old Mar 13, 2005 | 11:46 AM
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Eh whatever I didn't pay much attention to the $40 tires on my car now 255s will work though.

Thanks, Ted. I forgot you had that page up.
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Old Mar 18, 2005 | 02:04 AM
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From: Big Island Hawaii
255-40-17 Kumho MX...
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