speedo gear size

[red cuda]

I measured my rear wheel from center to the edge. 11 1/2 inches. what size speedo gear do I need. thanks

 

[pishta]

Uh, what rear you got?> Generally, a stock sized tire uses the rear gear ratio X 10 for tooth count ie, 2.76 rear would use a 27 tooth gear, 3.9x would use a 39 tooth, etc. Itll get you close.

 

[red cuda]

uh.....geez.....uh......its a 2.76 gear. 15x7 wheels with 205/60-15 tire.

 

[jerry6]

this might help http://www.mymopar.com/speedometer.htm

 

[fishy68]

a 30 tooth should be real close as long as your speedometer itself is accurate