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Originally Posted by TheSt|G
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This is a sweet link with some really cool looking tires. Anybody know the performance specs or price?
For the original question. People have run 225/50 on 9's. Stretching the tires over the wider wheels provides 2 performance advantages.
1. Theoretically, stretching the tire will cause less sidewall flex which will improve the directness feeling during directional changes.
2. The wider track offered by the 7's and 9's will improve handling, even if wearing the same sized rubber.
But more importantly, the 7's and 9's improve the look of the car. 9's are ungodly rare and expensive. You're already there. Even if tires are no longer available, because they were original equipment on 930's and 930's are sky rocketing in value, the value of 9" Fuchs will always increase. And as 930's keep increasing in value, somebody will produce a tire for them. Even if it's a specialty, limited run tire. Look at the 9" and 11" x 15" RSR Fuchs. You can only get vintage racing tires to fit them, but they keep going up in value.
The rear flares on an SC or Carrera are very similar in contour to a 1973 Carrera RS. The RS, the Carreras of 74 - 76, and the Carrera 3.o of 76-77 were all offered with 8" rear Fuchs from the factory as an option. When the SC arrived with its rear flares, most were disappointed by the lack of wider rear wheels options. Not just for the option of wider rubber, but from an appearance standpoint.
Due to their offsets and widths, 9" Fuchs have a very similar frontspace as an 8" Fuchs, so they fill the rear fenders similarly. But the 9" Fuchs fill the fenders more. The outside lip of a 9" Fuchs is 8.3mm closer to the fender than an 8" Fuchs.