Tyre Help please!

Post Tue Mar 17, 2015 5:31 pm

Just bought a new set of wheels for the e30 and I need some help working out the correct tyre sizes to get!

Wheels specs are 7J ET25 Front and 8J ET18 Rears in 15".

I'm after a lower profile than standard but don't want to go as far as stretching them. Any recommendations or advice would be appreciated! car is currently quite low on coilovers but can be raised or lowered to accommodate...

I was thinking 195/45 and 205/45, but am shooting in the dark!

Post Wed Mar 18, 2015 4:37 am

Check out link below, just feed in rim sizes and it will give you min/ideal/max width and then you just need to work out your profile, best done to keep your rolling circumference as close as possible to std as this has a direct relation to speed.

Your e30 has the speed sensor in the diff, so your indicated speed wont change but your actual speed will, hence keep rolling circumference as close as possible to std. Cheers.

http://www.tyresizecalculator.com/tyre- ... calculator