How big a diff. in RPM? [Archive] - Chevelle Tech

: How big a diff. in RPM?


DOCS69SS
Sep 25th, 07, 7:25 PM
Can anyone tell me there aprox. RPM's running 3.73's with the 295/50/15 at about 65MPH? Im considering going with the 275/60/15 to get the taller tire, but dont know how big a difference there would be.Any suggestions would be appreciated.

animal69
Sep 25th, 07, 7:47 PM
About 5.2%. You can use this: http://www.miata.net/garage/tirecalcold.html

DOCS69SS
Sep 25th, 07, 8:05 PM
Thanks for the reply,but does anyone know what that equates to in RPM,s

Mr Chevelle
Sep 25th, 07, 8:27 PM
Can anyone tell me there aprox. RPM's running 3.73's with the 295/50/15 at about 65MPH? Im considering going with the 275/60/15 to get the taller tire, but dont know how big a difference there would be.Any suggestions would be appreciated.

I figured it without an overdrive transmission:
275/60 = 2909 rpm
295/50 = 3063 rpm

TMessick
Sep 25th, 07, 10:11 PM
I figured it without an overdrive transmission:
275/60 = 2909 rpm
295/50 = 3063 rpm

You're waaay off. I figure:
275/60 = 2911 rpm
295/50 = 3062 rpm

:D

Basically, figure about 3060 with your current tyres, 2910 with the new tyres.