Changing wheel size affecting speedo?

[M20power93]

I want to change from my factory bottlecaps to keskin kt-1. Either staggered 16x7.5 and 16x9 or 16x9 all around. How much will this effect my speedometer?

[nando]

wheel size does not change the speedo at all. Tire size does, however. Shoot for tires that are ~23.9" in diameter if you want to keep the speedo accurate. IE 195/65-14, 205/55-15, 225/50-15, etc. google "tire size calculator" to find tire sizes for 16" that meet those requirements. 205/50 and 225/45 are close.

[Wh33lhop]

Unfortunately, 23.9" diameter tires are typically vagina tires in my experience with 14s and 15s. But, luckily for you 16" guys, there are 225/45 KDW2s and R888s, 215/45 XS and 205/50 Star Specs if you want some man tires. I don't mind running slightly smaller diameter tires--a fast reading speedo typically works out in your favor, and you lower your gearing a bit.