Is it ok to run 245/40/18s all around? Will if affect my speedo? Thanks
09-28-2003, 02:33 PM
#2
Your speedometer will be 3% slow.
Check out this calculator to see how different sizes affect rolling diameter and speedometer.<ul><li><a href="http://www.miata.net/garage/tirecalc.html">http://www.miata.net/garage/tirecalc.html</a</li></ul>
09-28-2003, 02:45 PM
#4
As long as they don't rub anywhere it should be ok.
You can get too wide in the front and diminish steering response but I don't think that 245s would be wide enough to notice.
09-29-2003, 11:49 AM
#6
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Which would be fine, because German cars typically read high to begin with.
Car and Driver claimed this was because of German laws holding the manf responsible, even if the consumer put on larger wheels.
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