Another tire question
Thread Starter
2nd Gear Member
Joined: Nov 2008
Posts: 428
From: Boardman, OH
Another tire question
As some of you have read i have purchased some rims with out tires. Well now its time for me to get some tires. The rims are 20x9 and the recomended tire is 275/35/20. Is there a bigger or smaller tire i can run on these and be ok? Is that sidewall to small? Thanks in advance!!
6th Gear Member
Joined: Jun 2007
Posts: 16,182
From: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)
With a 20, there's not much choice in sidewall. As far as width, check the specs on the tires that you want to run. Sites like tirerack have specs for all of the tires they sell with min and max rim widths for each tire size based on the tire manufacturers specs. From a safety perspective, it's best to stay within those recommendations. You CAN go outside those specs but at your own risk.
Cut & Paste Expert
Joined: May 2007
Posts: 13,322
From: NW Arkansas
You really want to match the OEM tire overall diameter unless you can
change the revs per mile settings with a tuner.
There are tire calculators all over the web...
http://www.miata.net/garage/tirecalcold.html
Put in the OEM size and then spec a 20" tire.
Look for the same RevsPerMile...
http://www.1010tires.com/TireSizeCal...?action=submit
https://www.rsracing.com/tech-wheel.html
A pic of OUTSIDE THE SPECS:
change the revs per mile settings with a tuner.
There are tire calculators all over the web...
http://www.miata.net/garage/tirecalcold.html
Put in the OEM size and then spec a 20" tire.
Look for the same RevsPerMile...
http://www.1010tires.com/TireSizeCal...?action=submit
https://www.rsracing.com/tech-wheel.html
A pic of OUTSIDE THE SPECS:
4th Gear Member
Joined: Jan 2005
Posts: 1,190
From: Florida
nope, at that point there's so much deflection the tire is getting worked far beyond what it was designed to handle. the tire flexing while you drive is what causes it to heat up and that tire is flexing in ways it's not supposed to.
"safe" would be what the manufacturer of the tires says to do. they set those guidelines and are liable for the tire if run correctly. do something else and it's at your risk.
honestly a small stretch and I wouldn't worry, it depends what you're doing really. normal driving you can get away with a lot. high speeds on the highway or track use and you're pushing your luck.
"safe" would be what the manufacturer of the tires says to do. they set those guidelines and are liable for the tire if run correctly. do something else and it's at your risk.
honestly a small stretch and I wouldn't worry, it depends what you're doing really. normal driving you can get away with a lot. high speeds on the highway or track use and you're pushing your luck.
