Tyre Profile Size - Help Please

[8sum8]

Originally Posted by CHASP

Hello
I have a 1999 Porsche Boxster. I have just purchased a set of new Wheels for the car and now I am looking at getting some brand new tyres fitted to them. What I would like to know is what size Profile tyres I need.

My wheels are F 18 x 8 & B 18 x 10

I would like to fit to the front 235 Tyres and the rears 285 Tyres. What I dont know is what profile I need on each tyre.

Thanks in Advance!!

C
H
A
S
P

When deciding on plus size tires it is important to determine the diameter of the new wheels. It is important that the wheels are not too big for the wheel wells or result a higher or lower rides. I have seen so many ugly setups where the cars ended up looking like carraiges because the wheels are just too tall. Another reason to ensure that the speedometer and techrometer remain accurate or very close. The stock tire sizes for 18" on boxster are 225x40x18 (front) and 265x35x18 (rear). The following link can be helpful deciding on the apprpriate plus size tires:
http://www.miata.net/garage/tirecalc.html

Good Luck