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Old 10-03-2006, 09:16 PM   #1
Mark351
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Join Date: Jan 2005
Location: State of Euphoria Mod: F-Series
Posts: 3,035
Default Wheels, Tyres, and why IRS is not better than live axle when upgrading

Not sure if any of you are deeply aware of rules governing aftermarket wheels, but as far as the increase in wheel track in Vic goes, IRS-fitted cars are only allowed an addition 25mm increase. I think the maximum tyres width put on an AU XR was a 245 (on an 18"x8" wheel) so the max you could increase to would be 255 on each size. Those of us with older live axle setups, can legally go to 265mm of each side, as the max increase is 50mm.

With the rules also allowing only a 25mm increase in wheel width, I wonder how rigidly this is scrutinised, and if that is why 8.5" and 9.5" wheels are made available, when presumably those with an 8" with wheel could to to 9", except an inch is technically 25.4mm.

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