Originally Posted by
tommytwotanks
How much difference will it make for me to increase my front tyre profile from '70' to '80'?
Will the engine speed at 70mph be significantly different....? or so similar as to not be worth the extra few quid for the larger profile tyres?
Mph per 1000 rpm might not be your only consideration! Tyre height may well be a limiting factor for clearance and even if they fit they may look very odd.