change in gear ratio switching from 275x40x17 to 275x60x15
12-24-2008, 07:20 PM
#1
change in gear ratio switching from 275x40x17 to 275x60x15 So currently I am running 275 x 40 x 17 tires and I want to switch to a 275 x 60 x 15 setup because I love that fat big tire look in the rear but I want to know what this is going to do to my gear ratio. I currently am running 3.42 gears, is this going to make it more like a 3.23 gear ratio? Also if anyone has a good online calculator for this please post it. Thanks.
EDIT:
I actually found this calculator online. http://www.izook.com/gearcalc.htm
according to it 275 x 40 17 tire is 25.66" in diameter and the 275 x 60 x 15 tire is 27.99" in diameter. If you plug those into that calculator I just posted with my starting gear ratio of 3.42 it says my new ratio with the new tires is 3.73, is this right? I thought it went down when you went to a taller tire?
EDIT:
I actually found this calculator online. http://www.izook.com/gearcalc.htm
according to it 275 x 40 17 tire is 25.66" in diameter and the 275 x 60 x 15 tire is 27.99" in diameter. If you plug those into that calculator I just posted with my starting gear ratio of 3.42 it says my new ratio with the new tires is 3.73, is this right? I thought it went down when you went to a taller tire?
Last edited by tording99Z28; 12-24-2008 at 07:41 PM.
12-24-2008, 08:30 PM
#2
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what that calculator is telling you is that with your new taller tire you will need a 3.73 to keep you going the same mph for a givin rpm. It will make your final drive ratio go down.
