I've researched changing wheel size as this is on my agenda as soon as the existing tyres need replacing, I've done this before, I changed from 17" to 16" wheels for my Primera, I purchased genuine 16" wheels as stated in the brochure and saved a fortune with tyre costs (tyres cheaper for this size) as well enjoyed a better ride. I believe the speedo was slightly out, but not by much.
For my existing car I will be going from 17" to 15", to a size supported in the manufacturer's brochure and already fitted by another user on the vehicle owner discussion forum. Why? well the smaller tyres are much cheaper to buy, the ride will be better and my prefered choice of tyre (CrossClimate) is not availaible in the 17" size.
This website helps when changing wheel size, note the importance of making sure the new size wheel will not foul braking system, and speak with insurers too. The spelling is American but the informaiton includes European cars.
https://www.wheel-size.com/
Another useful website, includes information about the impact on the reading of the speedo
http://www.willtheyfit.com//
Edited by Smileyman on 02/02/2018 at 22:10
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