I have the factory standard alloy wheels and tyres which are 195/55 R14. Assuming my calculations are correct, the overall size of the wheel and tyre would be;
14 inches = 355.6mm + (55% of 195 = 107.25mm) total = 462.85mm in diameter.
As this would be the diameter at which the speedo is calibrated to, I really need to keep any replacements the same size overall. If I increase the overall wheel size then I lose out on acceleration a little bit etc etc.
I have got my eyes on some nice OZ Racing superturismo wheels someone has had sprayed a dark grey which would awesome on my grey pulsar. But these are 16 inch and already have tyres which I would need to change.
Assuming I got these then 16 inches = 406.4mm which only gives me 56.45mm for the tyres so I would be looking at getting some 195/30 R16 tyres which seem almost impossible to get. If I got 195/40R16's then this would put the overall size at 484.4mm which is 22mm wider than the standard wheels, Would I be better off getting 15 inch wheels? or does the size increase not really matter?