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Does changing the rims and tyres affect the speedometer?

Asked by Tony

I am looking at changing my rims and tyres on a 2017 Ford Ranger Wildtrack. It currently has 18-inch rims and I am thinking on fitting 20-inch rims with 285/50 Nitto tyres.

Does this affect the speedometer or any of the ratios in the transmission?

Answered by CarsGuide

12 May 2018 Graham Smith

It will have some affect on the speedo – I estimate about 2 per cent – and it will have an affect on the speeds in each ratio. I would recommend you talk to your tyre retailer to determine that full affect of the change.

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