wheel and speedo q

[The Darkness]

i have a vk. im putting on 17's. i need to know asap what profile tyre i need to keep my speedo correct. i have 215/55/17 and 215/45/17 available. also which wheels drive the speedo cable so i know which profile to put on which axles

 

[vnv8driver]

on a commodore with 17 inch rims you need a 45 series tyre, for example- 235/45/17

Bear in mind though that going to a differant size rim/tyre even with the correct size series tyre will put your dash out a few kilometres. (not much)

 

[Ozzie]

not too sure on the 215's but the 235/45/z17's knocked my speedo out by 3k's
maybe that will give you an idea?

Maybe a tyre fitter might know more.

 

[The Darkness]

a few i dont mind. what about the axle prob. which wheels drive the speedo

 

[202injected]

the speedo is driven off the mainshaft at the rear of the gear box.

if you are really worried about it the CRS and several other speedo/gauge repairers have a "fix box" which changes the speedo cable speed by a series of tiny gears, costs about 180 200 last time i checked.

As i have a bigger problem cause i changed my car to a celica 5 speed now my tripmeter reads 700m for every kilometer and now that i have changed the diff ration to 3.45:1 i will need to get it done again