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Quote: Originally Posted by stuartkey

Another question...

Will a 20kg reduction in UNSPRUNG weight (ie wheels & tyres) be more noticeable than a 20kg reduction in SPRUNG weight (ie stripped interior or whatever)?

Maybe wrong but the answer would have to be yes ... reduction in weight for wheels / tyres also reduces rotational inertia of the wheel, thereby reducing work required to turn the wheels and improving responsiveness ... not to say that any reduction in weight wouldn't be of some benefit (as long as the reduction did not significant alter weight distribution ratios)

Larger wheels inherently have a greater rotational inertia than smaller wheels (mass of rim is further from the centre of rotation) and therefore will always be harder to spin up ... this has to be balanced with the fact that larger wheels typically accept wider tyres that provide increased contact patch and hence traction ...

Bit of a juggling act ... personally I think light weight 17" are a good comprise between looks, handling and performance but I suspect that opinions will vary