)thank you! glad i could helpForgot to say, I swapped out for 325s in the rear when I did that. You lose that stretched tire look in the rear and it matches the poke from the front better. Look for pics I've posted and you'll see what I mean. Also, look for pics @Prokiller put up (this one kept me going while I was waiting for my car to be built)
Put less than 30 miles on the PP2 OE Michelin tires, then swapped them out for Continental Extreme Contact Sport tires. Kept 305/30x19 on the front, but upgraded the rears to 325/30x19. The slightly taller 325 tires increased ride height by +/- 0.25" but was offset by the installation of Steeda springs (555-8243). I have no plans to track the car so absolute adhesion is not a primary factor, but having the 340 wear factor is. Ford indicates a skid pad rating of 1.06g for the Cup 2 tires. We did a 'quick & dirty' skid pad test & got 0.997 w/the Continentals which pretty much relates to zero difference on the street. Plus, the 325 tire most definitely fills out the rear tire well & (as m0.s550 indicated) "it matches the 'poke' from the front better."I'm sure a few of you have swapped the OE Sport Cup 2 tires out for others & wanted your input.
Your contact issue w/the 325 tire is a wheel offset problem, not a tire width problem. I have Continental 325/30x19 tires on OE PP2 11" rims on the rear w/zero issues. If your existing rim is offset too much to the inside, even a 305 tire may not work. Hopefully someone on this site w/the exact same rim as you have can verify a 305 tire fitment. Both Michelin & Continental recommend a 10.5" to 11.5" rim width for their 305/30x19 tire. One final thought ... a 305 tire mounted on an 11.5" rim on the backside of the S550 Mustang (especially a GT) may present some unique handling issues. Maybe someone out there can provide more concise information on this (potential) issue.... sadly the rears hit the Magneride w/the 325 Toyo tires. Anyone know if I swap out to the SC2 305 width would it be stretched too far on an 11.5" wheel? I'm thinking the less wide tire will give me the ~10mm clearance I need w/out going to a spacer.
...Plus, the 325 tire most definitely fills out the rear tire well & (as m0.s550 indicated) "it matches the 'poke' from the front better."![]()
