Originally Posted by ChrisConvertible
Peter,

Did you notice much drop in performance with bigger tyres? On another car I went from 205/55/r16 to 235/45/r17 when I needed new wheels (son crashed into a gutter frown ) and the performance felt shocking, the car was really sluggish. The tyres were 7mm more in diameter, I ended up replacing them with 235/40/r17 which is 6mm smaller than the 205/55/r16 in diameter and the car felt fine again.

Chris

It probably means that I tend to use a lower gear in some situations but on the other hand it has slightly longer legs when up to cruising speed. The difference in circumference is 3%. So that means 3% less in wheel revolutions for a given distance. Around town I tend to stay in 4th gear when at 50 kph.

Peter

[Linked Image]