speedo vs 17' rim

[caineroad]

so i upgraded my rims from (175/65/14) 14' to 17', 205/45/17 does anyone know how is that going to affect the speedo, is it going to show slower or faster? by how much?

thanks

[CTScott]

That is going to make a fairly significant difference (with the speedometer measuring lower speed than before).

You are going from 879 revolutions per mile to 831 revolutions per mile. So, at 100 kmh you will be showing 94 kmh on your speedo.

[kimona]

My speedo wasn't accurate out of the box. With stock 185/60/15's (23.7") my speedo was off, but with 205/50/16's (24.1"), my speedo is dead on.

[caineroad]

That is going to make a fairly significant difference (with the speedometer measuring lower speed than before).

You are going from 879 revolutions per mile to 831 revolutions per mile. So, at 100 kmh you will be showing 94 kmh on your speedo.

wow! gotta watch my speedo from now on lol!