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Wheel size help

 
Old 02-10-2019, 06:49 PM
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mbean
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Default Wheel size help

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 [email protected]@@ 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.
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Old 02-10-2019, 09:33 PM
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ExMB
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You are changing the effective offset, back spacing by only changing 1 part of the equation.

I'm still confused by your statement of using 255s on a 8" wheel but only being able to use 245s on that 9" one.
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Old 02-11-2019, 08:25 AM
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mbean
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I goofed: I meant 225 fronts were originally on the car.

QUOT=ExMB;15629882]You are changing the effective offset, back spacing by only changing 1 part of the equation.

I'm still confused by your statement of using 255s on a 8" wheel but only being able to use 245s on that 9" one.[/QUOTE]
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Old 02-12-2019, 01:56 PM
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OK, what does changing the effective offset mean for the handling of the car? Any difference in performance or the way it handles?
Any insights appreciated.
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