Guest Posted May 28, 2015 Share Posted May 28, 2015 Just seeing if anyone has any advice on changing alloys from 195/50 r15 to 205/40 r17. As I said just seeing if anyone knows if it would effect the car massively, mainly the speedo. Cheers Quote Link to comment Share on other sites More sharing options...
troy45 Posted May 28, 2015 Share Posted May 28, 2015 Do a search on the web for tyre size calculators, you'll be able to put in all sorts of combinations of tyre sizes and get a figure for speedo error for each in comparison to your original sizes. Course this doesn't always translate directly to real figures as different manufacturers tyres can vary in actual size. Quote Link to comment Share on other sites More sharing options...
Guest Posted May 29, 2015 Share Posted May 29, 2015 Ah lovely cheers, says it's roughly 2mph faster than what the speedo would say at 65 Quote Link to comment Share on other sites More sharing options...
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