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what effect does taller tire have on gear ratio? #124339 09/22/08 10:26 AM 09/22/08 10:26 AM
Joined: Feb 2003 Posts: 2,138 tucson az F frank OP top fuel
frank OP top fuel F Joined: Feb 2003 Posts: 2,138 tucson az	If putting a taller tire on a vehicle than stock, will that have an effect on gear ratio? So would putting a taller tire on make a car or truck with a 3:55 act like a 3:28? Would this result in better MPG?? Is there a calculator for this?? Thanks

Re: what effect does taller tire have on gear ratio? [Re: frank] #124340 09/22/08 10:33 AM 09/22/08 10:33 AM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	better for mpg but worse for et. a taller tire will act like a lesser gear.

Re: what effect does taller tire have on gear ratio? [Re: frank] #124341 09/22/08 10:48 AM 09/22/08 10:48 AM
Joined: Nov 2007 Posts: 21,823 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,823 Kirkland, Washington	Quote: If putting a taller tire on a vehicle than stock, will that have an effect on gear ratio? So would putting a taller tire on make a car or truck with a 3:55 act like a 3:28? Would this result in better MPG?? Is there a calculator for this?? Thanks Short answer: yes. You can calculat it from your starting point: Lets say you have 26" tires and 3.55 gears, and you're contemplating moving to a 28" tire. 26 x pi = 81.7" 28 x pi = 88.0" thats a 7.7% difference. (100-7.7) = 92.3 .923 (cause we're dealing with percentage) x 3.55 = 3.28 So a change from 26 to 28 in tire diameter would have the effect of going from a 3.55 gear to a 3.28. (some rounding error is present in the above exampple...but you get the idea)

Re: what effect does taller tire have on gear ratio? [Re: Pacnorthcuda] #124342 09/22/08 10:53 AM 09/22/08 10:53 AM
Joined: Apr 2008 Posts: 1,195 Snowing in the north! D Dart 340 moparts member
Dart 340 moparts member D Joined: Apr 2008 Posts: 1,195 Snowing in the north!	Quote: Quote: If putting a taller tire on a vehicle than stock, will that have an effect on gear ratio? So would putting a taller tire on make a car or truck with a 3:55 act like a 3:28? Would this result in better MPG?? Is there a calculator for this?? Thanks Short answer: yes. You can calculat it from your starting point: Lets say you have 26" tires and 3.55 gears, and you're contemplating moving to a 28" tire. 26 x pi = 81.7" 28 x pi = 88.0" thats a 7.7% difference. (100-7.7) = 92.3 .923 (cause we're dealing with percentage) x 3.55 = 3.28 So a change from 26 to 28 in tire diameter would have the effect of going from a 3.55 gear to a 3.28. (some rounding error is present in the above exampple...but you get the idea) Yep, you could do that or just use this cool widget. http://vexer.com/68rt/speed.html

Re: what effect does taller tire have on gear ratio? [Re: frank] #124343 09/22/08 05:00 PM 09/22/08 05:00 PM
Joined: Feb 2003 Posts: 2,138 tucson az F frank OP top fuel
frank OP top fuel F Joined: Feb 2003 Posts: 2,138 tucson az	thanks

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