hi could anyone tell me what tyre size i should have on my95 classic i have a set of 17" 2007 impreza wheels which have 215/45/17 tyres on. The reason im asking is because ive just changed my clocks from kph to mph white dials and my speedo is out but it gets worse the faster you go. Im not sure if its the tyres or the clocks? if its the clocks how do i get it to read right

 

215/40/17 or 205/45/17 IIRC

 

so would that put my speedo out and get futher out the faster i go?

 

Yes by 3.6% when you are at 60mph you are actually going 62.1mph.

Have a look hear mate will tell you all you need to know.

Tire size calculator

 

thanks for that but when im doing 60 on my speedo my sat nav says 40 and when my speedo shows 100 its doing about 75/80, i think it could be the white dials as it showed 240kph on the orginal and the white dials show 180 mph could this be where my problem is?

 

If your old dial read 240kph full-scale, then that's equal to 150mph (not 180).

 

would this still have to have one of those converters on the back of the clocks?
also all the white dial kit seem to come with 180 mph or 110 mph where can i get a 150 mph one from?