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Author Topic:   gearing with tires?
rickb33
Member
posted January 20, 2003 11:06 PM
I had a printout from summit racing about this very same subject and I lost it. It gave an equation to figure this up...Maybe Jammin can find that and post it in the toolbox...He's probably not doing anything anyway...lol.


Darcy
Member
posted January 21, 2003 05:04 PM
try running a 245/60/15 or 255 on the same rim your roll out will go from say 81 inch to around 84 to 86 inch roll out or just change your ratio


dean_7585
Member
posted January 22, 2003 06:23 AM
I think changing the tire size is a small adjustment. You need to get close with a different gear and then tweek it with tires.


Smitty77
Member
posted January 22, 2003 11:29 AM
Hey guys this brings up a question,what about running 14" tires and wheels over 15"?
Wont this help with gearing and 14's are alot cheaper! What is the deal with tire roll sill have not quite figured this one out.I have learned more from this web site then working on pit crews for years.


justin
Member
posted January 22, 2003 07:10 PM
doubletrouble, tire roll or "roll out" is the circumference (distance around) of the tire. It is used for stagger measurements and, in this case gear choice. It can also be used when trying to add/lose wedge in the car by trying different tire sizes at the RF or LR (this would be in classes that don't allow weight jacks). When you swap your rear tires out for ones with more roll out it is the equivalent of running a lower gear (numerically) and vice versa. Hope I've helped.

Justin

[This message has been edited by justin (edited January 22, 2003).]

[This message has been edited by justin (edited January 22, 2003).]

fastrack1
Member
posted January 22, 2003 07:40 PM
HEY JUST GO TO THE TOOLBOX ON THIS WEBSITE IT WILL HELP MORE THAN U THINK ALL TH INFO IS RIGHT THERE


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