RPM-Tire Height ??

SCYALTR

Registered User
Hello,
If I wanted to lower RPM's at a particular speed say 65mph, would running a larger Dia tire help me do that?
For example, If I am running a 245/50 16 (25"+/- overall dia) and reaching 2.5K RPM's at 70mph would I lower RPM's if I went to a 245/50 18" Tire (27" +/- overall dia).
Any info would be helpful.
Thanks,
D Rainer
 
With the above sizes you'll only drop about 100rpm-that is based on an average-manufacturers will be different.

I tried several combinations-the best I could do was just over 100rpm difference. If you want a large drop in revs, you'll need to change the differential ratio. I have a 3.08:1 in my V8-I run 1800RPM at 74mph
 
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