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225/60s on stock 15"x7"s?

970 views 6 replies 7 participants last post by  jupiterpbc 
#1 ·
Does anybody know if i can run 225/60 on my stock 15"x7" rims? stock is 205/60
 
#2 ·
If you do that the diameter of the wheel will increase and the speedometer/mileage reading will be off.
 
#5 ·
http://www.miata.net/garage/tirecalc.html

original size: 205-65/15

size 1: 215-60/15 speed reading +1.3%

size 2: 225-60/15 speed reading -0.5%

size 3: 225-55/15 speed reading +2.9%

so if you are moving up to a 225, stick to 60 sidewall as it will remain as close as possible to the car's original speedometer setting.
 
#6 ·
I think the question pertains to the fit of a 225/60 on a 7 inch rim. I'd say its fine, as I have had 225/60's on 7 inch pontiac rims, and the fit is within the limits of the rim.
 
#7 ·
My 1990 560SEL registers 67 1/2 MPH when I am actually traveling 65 MPH. How do I know this? I checked it with my handheld Garmin GPS and the faster you are moving the more accurate the device becomes and is sensitive to .1 MPH.

A cool way to confirm your speed.

Gary
 
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