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Message: <blockquote data-quote="Tom328" data-source="post: 710176" data-attributes="member: 16210">Yeap, should try get it back to the original rolling radius. If you had gone with the original tire size, your meter would have been over reading (meter reading 100km/h but you would actually be doing 98km/h). This would then affect all your readings and service intervals (negligible, i would say).But yet again,1) What about similar models which are rolled out from the factory brand new with optional original 18" rims on them?? Are the meters or anything else tweaked in anyway to suite the rim size?? I don't think so.2) Different models of the same manufacturer (say Pilot Sport 3 vs Pilot Preceda) also have different roll radius despite being the same size. Look through their brochures.3) Most meters tend to be more optimistic (reading higher than actual speed).SO, it boils down to what you would want to achieve with the given roll radius.</blockquote>