hsmith

I will be getting MPSC2 in the spring for my GTS to use as a dual purpose tire (street and track use). Do the tires grip overwhelm the stock SPASM suspension? Instructor/advanced level driver. I was hoping the suspension would be able to cope with the added grip without feeling too soft.

Larry Cable

better order them now, the 305/30-20's are on backorder with no fulfillment date as of now, just like the MPSS in the same fitment

008

I wouldn't say it's overwhelmed, certainly your times will drop significantly with the 2s but the car is too soft imo even with the stock tires when pushed hard on the track. Obviously it's a compromise but I would have liked to see the SPASM be a bigger jump from the standard set up. You won't be disappointed in the 2s. Best street tire made imo.

BradB

A problem I've run into looking for optional tire sizes is that the overall diameter measurement of the wheel/tire changes quite a lot. I'm always afraid too large a difference from OEM will result in oddball feedback to the cars computers. Anyone have a rule of thumb as to what the percentage of varience can safely be?

hsmith

Okay. Thanks. I look forward to giving the cup 2's a try in the spring. I wish they make the yoko AD08 R's in the 991 sizes. I had great experiences with those tires in my previous M3 as a dual purpose tire.

008

You'll love the 2s, light years ahead of the AD08Rs imo. I ran those on my M3 too, the michelins have the wear and water evac of the 08Rs and better grip than the A048s.