robingb

I want to change to cup 1 wheels (17x7et55 and 17x8et52) on my 1990 964. what if any modifications are needed? thanks

scped

No changes - just bolt 'em on

Vandit

What are you currently running? 16"s?

You can get away with no changes, but ideally, you'd want to update the steering stops to prevent rubbing on the inner front fender wells when you have the steering at full lock.

993James993

In addition to the steering stops there is an updated wheel carrier. PDF's for both factory TSBs can be found here:

http://www.pcarworkshop.com/index.ph...C_Parts_Guides

sml

it's no big deal if the steering rubs on full lock. i have never turned the wheel to full lock at more than about 2km/h, and as you are aware there is a rub, you just need to be a little careful and dont ram the steering wheel as hard as possible on full-lock. just back-off if it touches lightly. you get used to the rub point anyway after a few months. no big deal.

Silvertarga

Once you rub it enough its bare metal and then rust...