Gears vs Tires
Thread Starter
Melting Slicks
Joined: May 2005
Posts: 3,461
Likes: 161
From: Las Vegas Nevada
St. Jude Donor '08
Gears vs Tires
Hello everyone,
This is my first post. I have beed reading post for a month or so and find that most of you really know what you are talking about.
My question is if changing the diameter of a tire from 26.67 inches to 24.73 inches and the axel ratio is 3.42, will this have the same effect as changing the effective axel ratio to 3.69?
3.42 x26.67/24.73 = 3.69.
Am I barking up the wrong tree, or will this have the same effect as changing the gears to 3.69?
Thanks to all.
ps Vararam works and both Predator and Hypertech programers are a POS. This is from my own experience. Should have listened to your advice from the beginning.
This is my first post. I have beed reading post for a month or so and find that most of you really know what you are talking about.
My question is if changing the diameter of a tire from 26.67 inches to 24.73 inches and the axel ratio is 3.42, will this have the same effect as changing the effective axel ratio to 3.69?
3.42 x26.67/24.73 = 3.69.
Am I barking up the wrong tree, or will this have the same effect as changing the gears to 3.69?
Thanks to all.
ps Vararam works and both Predator and Hypertech programers are a POS. This is from my own experience. Should have listened to your advice from the beginning.
Instructor
Joined: Mar 2005
Posts: 134
Likes: 0
From: San Antonio Tx
I'm going to take a stab at this, but I may not be right
3.42 means driveshaft turns 3.42 times for every axle turn.
26.67 inches diameter has a circumference of 26.67*Pi or 83.75" / 3.42 axle turns = 24.48" per axle turn at 1:1 ratio
Now with 24.73 inches circumference is 77.65
77.65" / 3.42 axle turns = 22.7" per axle turn at 1:1
24.48 / 22.7 = 1.07:1 ratio
1.07 * 3.42 = 3.68
3.68, oh wait, that is your answer.... Guess algebra is good for something
or maybe we are both wrong 
3.42 means driveshaft turns 3.42 times for every axle turn.
26.67 inches diameter has a circumference of 26.67*Pi or 83.75" / 3.42 axle turns = 24.48" per axle turn at 1:1 ratio
Now with 24.73 inches circumference is 77.65
77.65" / 3.42 axle turns = 22.7" per axle turn at 1:1
24.48 / 22.7 = 1.07:1 ratio
1.07 * 3.42 = 3.68
3.68, oh wait, that is your answer.... Guess algebra is good for something
or maybe we are both wrong
Drifting
Joined: Sep 2004
Posts: 1,727
Likes: 19
From: Carson City, NV
Originally Posted by LV Vette
Hello everyone,
This is my first post. I have beed reading post for a month or so and find that most of you really know what you are talking about.
My question is if changing the diameter of a tire from 26.67 inches to 24.73 inches and the axel ratio is 3.42, will this have the same effect as changing the effective axel ratio to 3.69?
3.42 x26.67/24.73 = 3.69.
Am I barking up the wrong tree, or will this have the same effect as changing the gears to 3.69?
Thanks to all.
ps Vararam works and both Predator and Hypertech programers are a POS. This is from my own experience. Should have listened to your advice from the beginning.
This is my first post. I have beed reading post for a month or so and find that most of you really know what you are talking about.
My question is if changing the diameter of a tire from 26.67 inches to 24.73 inches and the axel ratio is 3.42, will this have the same effect as changing the effective axel ratio to 3.69?
3.42 x26.67/24.73 = 3.69.
Am I barking up the wrong tree, or will this have the same effect as changing the gears to 3.69?
Thanks to all.
ps Vararam works and both Predator and Hypertech programers are a POS. This is from my own experience. Should have listened to your advice from the beginning.
John
Le Mans Master
Joined: Sep 2004
Posts: 5,707
Likes: 4
From: Los Angeles
Originally Posted by mountainbiker2
Don't forget that the front tires need to be the same or a little smaller then the rear for the active handling to work right.
Steve
Steve
If you go with a smaller diameter rear tire than the front, your traction control system will think your rear tires are spinning. So be aware that you will need a proportional set of front tires as well.
