Hello. If I purchase 18x10 wheels, can i put 305x35x18 wheels on the 10" wide rims? and what offset do i have to get those wheels with? can you tell me offset limits i can use for this setup on 997.1 turbo?

 

Make sure you keep the front/rear outside tire diameters the same ratio as stock or you will end up blowing your diff.

 

Hello. Stock 305x30x19 and 305x25x18 is less then .2" difference which is more then acceptable as the tire wear is more then this right?

 

Most tire manufacturers require a minimum 10.5 in wide wheel for a 305 tire. We think 11 is better.
Also, be sure to maintain the OEM revs/mile relationship front to rear or you will damage the drive train. There is only a 1% tolerance.