Originally posted by Chris
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Interestingly, all the tyre websites that display the "permitted rim widths" data show a 235/40/17 as ok for 8"-9.5" rim but a 245/40/17 the same 8"-9.5". However the 235/40/17 fits the factory 7.5" rim without looking too wide for the rim or bulging.
Conversely I figure that if a 235 is ok for up to 9.5" rim then a 245 tyre should just be ok for 10" rim given that 1/2" is around 12mm and the tyre is 10mm wider, so only 2mm "over". It must be that as the 245 just misses out on criteria by this 2mm it is still classed as 9.5" max. perhaps.
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