guys is there a tire/wheel speedo calculator to tell how much my speedo will be off running different size wheels/tires

actually does anyone know how much my speedo would be off with 18x10's 285/30's? lets say at 25mph

thanks
Steve

 

a 285/30 18 is just a hair smaller diameter than the stock 225/50 16 -- about 0.5%. You will essentially notice no change whatsoever in speedometer accuracy.

 

Rynberg how about a 255/35/18 how much difference would that make?

 

Damn you guys, just do the math... j/k

If you are close to the stock wheel+tire diameter, you will be fine:

245/45 16, 245/40 17, 255/40 17, 245/35 18, 255/35 18, 285/30 18, 295/30 18: any of these will be close enough to not make any noticeable difference in speedo accuracy

265/40 17 and 265/35 18 are still pretty good and the speedo will still be within 2 mph at 100 mph.

 

thanks man!