Another 235/285 tire question
08-30-2009, 01:54 PM
#1
Another 235/285 tire question
I am getting ready to order some new track rubber, specifically Michelin Sport Cups, and am seeking feedback from those that who have used a 235/285 combination on the track in this tire or any other track tire. Yes, I have scoured the archives looking for information but couldn't find anything definative for track use.
I recently installed PSS10s along with ERP front camber plates, and set the car up at 10mm below RoW Sport (or 10mm above RS, depending at how you want to look at it). The alignment was set at -2.5 front camber and -3.1 rear. Previously, I had Bilstein HDs on RoW M030 turbo springs set right at RoW Sport height with -1.8 front camber (this was all that could be achieved sans plates) and -2.3 rear. In both cases, the car has the M030 22mm front bar and 21mm Ruf rear bar. I had run the normal 225/265 combination of MPSCs on the previous set up and ended up roasting the outside edges of the rear tires well into the cords and just started to cord the fronts after 8-9 track days with plenty of meat left on the inside 3/4s of all the tires. In the new configuration, it looks like I could easily put a 235 in the front, with maybe even a small spacer, and it looks like there is enough room to go with a 285 in the rear without any fender rolling. I would be using 8 and 10 inch factory hollow spoke wheels.
Question is, should I stay with the 225/265 configuration and see what the new suspension does for me or put the wider 235/285 rubber on? Has anybody with roughly the same ride height and alignment specs had any rubbing issues using the bigger sizes? Would the 235/285 be any less balanced than the 225/265 setup? Would it gain me any more turn in and cornering abilities? Overall, the wider MPSCs are only a few more dollars than the narrower ones so cost is not an issue.
Any feedback is appreciated.
Thanks,
Mike
I recently installed PSS10s along with ERP front camber plates, and set the car up at 10mm below RoW Sport (or 10mm above RS, depending at how you want to look at it). The alignment was set at -2.5 front camber and -3.1 rear. Previously, I had Bilstein HDs on RoW M030 turbo springs set right at RoW Sport height with -1.8 front camber (this was all that could be achieved sans plates) and -2.3 rear. In both cases, the car has the M030 22mm front bar and 21mm Ruf rear bar. I had run the normal 225/265 combination of MPSCs on the previous set up and ended up roasting the outside edges of the rear tires well into the cords and just started to cord the fronts after 8-9 track days with plenty of meat left on the inside 3/4s of all the tires. In the new configuration, it looks like I could easily put a 235 in the front, with maybe even a small spacer, and it looks like there is enough room to go with a 285 in the rear without any fender rolling. I would be using 8 and 10 inch factory hollow spoke wheels.
Question is, should I stay with the 225/265 configuration and see what the new suspension does for me or put the wider 235/285 rubber on? Has anybody with roughly the same ride height and alignment specs had any rubbing issues using the bigger sizes? Would the 235/285 be any less balanced than the 225/265 setup? Would it gain me any more turn in and cornering abilities? Overall, the wider MPSCs are only a few more dollars than the narrower ones so cost is not an issue.
Any feedback is appreciated.
Thanks,
Mike
08-30-2009, 06:05 PM
#2
I am getting ready to order some new track rubber, specifically Michelin Sport Cups, and am seeking feedback from those that who have used a 235/285 combination on the track in this tire or any other track tire. Yes, I have scoured the archives looking for information but couldn't find anything definative for track use.
I recently installed PSS10s along with ERP front camber plates, and set the car up at 10mm below RoW Sport (or 10mm above RS, depending at how you want to look at it). The alignment was set at -2.5 front camber and -3.1 rear. Previously, I had Bilstein HDs on RoW M030 turbo springs set right at RoW Sport height with -1.8 front camber (this was all that could be achieved sans plates) and -2.3 rear. In both cases, the car has the M030 22mm front bar and 21mm Ruf rear bar. I had run the normal 225/265 combination of MPSCs on the previous set up and ended up roasting the outside edges of the rear tires well into the cords and just started to cord the fronts after 8-9 track days with plenty of meat left on the inside 3/4s of all the tires. In the new configuration, it looks like I could easily put a 235 in the front, with maybe even a small spacer, and it looks like there is enough room to go with a 285 in the rear without any fender rolling. I would be using 8 and 10 inch factory hollow spoke wheels.
Question is, should I stay with the 225/265 configuration and see what the new suspension does for me or put the wider 235/285 rubber on? Has anybody with roughly the same ride height and alignment specs had any rubbing issues using the bigger sizes? Would the 235/285 be any less balanced than the 225/265 setup? Would it gain me any more turn in and cornering abilities? Overall, the wider MPSCs are only a few more dollars than the narrower ones so cost is not an issue.
Any feedback is appreciated.
Thanks,
Mike
I recently installed PSS10s along with ERP front camber plates, and set the car up at 10mm below RoW Sport (or 10mm above RS, depending at how you want to look at it). The alignment was set at -2.5 front camber and -3.1 rear. Previously, I had Bilstein HDs on RoW M030 turbo springs set right at RoW Sport height with -1.8 front camber (this was all that could be achieved sans plates) and -2.3 rear. In both cases, the car has the M030 22mm front bar and 21mm Ruf rear bar. I had run the normal 225/265 combination of MPSCs on the previous set up and ended up roasting the outside edges of the rear tires well into the cords and just started to cord the fronts after 8-9 track days with plenty of meat left on the inside 3/4s of all the tires. In the new configuration, it looks like I could easily put a 235 in the front, with maybe even a small spacer, and it looks like there is enough room to go with a 285 in the rear without any fender rolling. I would be using 8 and 10 inch factory hollow spoke wheels.
Question is, should I stay with the 225/265 configuration and see what the new suspension does for me or put the wider 235/285 rubber on? Has anybody with roughly the same ride height and alignment specs had any rubbing issues using the bigger sizes? Would the 235/285 be any less balanced than the 225/265 setup? Would it gain me any more turn in and cornering abilities? Overall, the wider MPSCs are only a few more dollars than the narrower ones so cost is not an issue.
Any feedback is appreciated.
Thanks,
Mike
