It will change the size of your bank balance when you see the price of suitable 16" tyres !
I agree, we went the other way on my wifes Mk2 Si, mainly triggered by the fact that the Diamond cut 16" alloys that the car came with had developed 'white worm' in a surprisingly short time - and diamond cut cost basically double compared to 'normal' alloys for a refurb ( the clear coat on the 'diamond cut' bits is p155 weak, and stone ships trigger an inevitable sequence of events ). Nothing to worry about the 'dynamics' of a family hatchback of limited performance, the ride is much more acceptable and quieter on 15" ( another reason for the swap was that my wife noticed how much better the ride was when 15" Nokian winter tyres were used in winter ). The much wider choice of tyres at much lower prices is a bonus.... The difference in tyre prices between 15" and 16" basically paid for the new alloys.
