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Zooksport2 · 07-27-2006, 12:06 AM

I have a Toyota Hilux, with a diff ratio is 4.10:1.
185R14 tyres are fitted, 25.65" diameter, 80.58" Circumference, 810.9 Revolutions per mile.

I am unable to change the diff / diff ratio, (just because) so I want to artificially change it by changing the tyre size. I have got a set of 15" rims, and can put new tyres on them. I considered 215R14, but I wanna go the 15's. I know about the speedo error, etc, so thats all cool.

I have two tyres in mind..
A) 215/75R15: 27.69" tall, 89.99" circumference, 751.1 revs per mile.

B) 225/75R15: 28.28" tall, 88.84" Circ, 735.5 rev per mile...

The tyres will fit, I am merely asking if anyone can please tell me what the effective "diff ratio" would be?

And/or the calculations for it.

I used this site to calculate the sizes, BTW..:
http://www.1010tires.com/TireSizeCalculator.asp

.

07-27-2006, 12:06 AM	#1 (permalink)
Zooksport2 Casual... Real Casual Location: Orstraylia	Please calculate diff ratio update I have a Toyota Hilux, with a diff ratio is 4.10:1. 185R14 tyres are fitted, 25.65" diameter, 80.58" Circumference, 810.9 Revolutions per mile. I am unable to change the diff / diff ratio, (just because) so I want to artificially change it by changing the tyre size. I have got a set of 15" rims, and can put new tyres on them. I considered 215R14, but I wanna go the 15's. I know about the speedo error, etc, so thats all cool. I have two tyres in mind.. A) 215/75R15: 27.69" tall, 89.99" circumference, 751.1 revs per mile. B) 225/75R15: 28.28" tall, 88.84" Circ, 735.5 rev per mile... The tyres will fit, I am merely asking if anyone can please tell me what the effective "diff ratio" would be? And/or the calculations for it. I used this site to calculate the sizes, BTW..: http://www.1010tires.com/TireSizeCalculator.asp . __________________ "And you run and you run to catch up with the sun but it's sinking. Racing around to come up behind you again. The sun is the same in a relative way but your older, shorter of breath, and one day closer to death" ...pink floyd Last edited by Zooksport2; 10-17-2006 at 10:56 PM..