I've been thinking of building a set of Fikse FM 10s out from their present 8*17" to 9*17. I bent one inner rim and ended up getting a set of 9" rims for the front that let us run 245 instead of the 255 on the front of our 944turbo track car. My question is do I need to replace both the barrel and the our lip equally, or could I just widen the inner barrel 1/2" and call it good? The 245 on 9" rims fit well and drive great, especially under hard braking. I don't want to be at the minimum width range for the tires, but I'm wondering if I need to replace both parts. From my dumb@@@ measurements it appears I need to widen each part 1/2 inch to replicate the ones we are using now, but would widening the inner part 1/2" be enough? The centers are great. Is there any place other than Fikse to get parts?
Of course if anyone has a pair of 245/17 or a set of 245/17 and 275/17 tracks wheels they want to get rid of drop me a message.