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First, the wider the wheel WITHIN THE LIMITS set by manufacturer the more air pressure it takes to 'flatten out' the tread to the ground. That works for max cornering. Usually there is a manufacturer's recommended rim width for spec tire pressures. (see mfg plate)
Second the diameter and section of the tire (see TireRack.com tire specs) allowed is dependent on the offset of the wheel as that controls the outer and inner edges of the tire.
For the Fit we recommend minimum 42 mm offset for stock ride height and 45 mm offset for lowered ride height with a tire that is 23.5" diameter .(195/55x15, 205/45x16, or 205/40x17) and not over 205 section width. Stock offset is 55 mm.
Last edited by mahout; 05-15-2008 at 07:09 PM.
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