simon_16vpunto said:
ok, 15" standard Fiat alloys in height are 584.5mm
205/40 17's which i have on my car are 595.8mm
so only 11.3mm difference
And cheers housty for thre link
There may only be what seems a slight difference in height between the two wheels but the thing that doesnt help is unsprung weight, there will be more weight traveling round in circles which requires more effort to shift due to all the weight of the extra metal of the alloy.
Best way i can decribe it is by using a mountain bike or racing bike, usually one of the first things to upgrade are the wheels, a nice lightweight set of wheels will make you faster and more efficent, and it is quite noticeable on a mountain bike with one man power.
Also take a note of what it does to your speedo if you do get big wheels, usually if the difference in height is small your speedo will read closer to its true mph (since most speedo's are out by around 10% as standard) but if your wheels and tyres have a more substantial difference then you may be going faster than your speedo is letting on