Tire Size And Its Effect On Final Gearing

[mjf6866 1]

so how much slower will i get using a 29" drag radial (MT Street R's 305/45-18 mounted to Bravada rims) vs my current drag radials (M&H Race masters 275/50-17 mounted to cheap cobra replicas)?

i have an 09 6-speed R/T with the 3.92 rear end. I know my half shafts would be at risk so i'd have to upgrade those too. i feel the 275s are too skinny and I am breaking traction with them.

my stock tires are 28.7" in diameter, the MT's claim to be 29" and the M&H's claim to be 28" tall.

I got a few opinions already, but looking for more. you guys are my go-to for serious numbers crunching drag racing info.

thanks for the help!

[Hemi31 194]

It all depends on what rpm you are crossing the line.

[BuckeyeGuy 82]

Go here :

http://wallaceracing.com/calc-gear-tire-rpm-mph.php

To calculate speed and rpm based on tire diameter.

[mjf6866 1]

thanks for the response guys!

hmmm, i cant remember what RPM i was at the last time I went...I do know I had to shift into 4th near the end of the 1/4.