One for the tyre experts...

[Dermot O'Logical]

I've bought a set of 5 wheels (4 x alloys 1 x steel spare) from a very nice chap on this here forum (Aaron2) and am looking to use them on my ph2 172.

Currently running stock 5 spokes 195/45/16 and have bought a set of 15's (in the same style, just smaller) that have some tired looking 185/55/15's. I'm going to change these for 4 x 195/50/15 PE2's.

Is the rolling circumference of a 185/55/15's much different to a 195/50/15? The spare tyre I have is brand spanking and I'd rather not replace it if I don't have to.

 

[the_prophet]

185's the width of the tyre remember, so its only a small difference in the profile (thickness). im confused though whether your going to use it or if its going to be a spare? if your using it, then no. you need to have the same profile of tyre on both sides of the axel. if its a spare then it doesnt matter.

 

[TimR26]

As above, will only be ok as a spare. This'll tell you the difference http://www.alloywheels.com/tyrecalc.asp