- Car tyre size change question
In the process of changing our car. The old one had 185-65-15 tyres and the new one will have 215-55-16 tyres. We have a set of winter tyres for the old car. I want winter tyres for the new car but the new size seems to come at a massive price premium so I thought I could possibly get a set of steel wheels for the old winter tyres and swap wheels/tyres round as and when required. There will be a size difference (which obviously will affect speedo/odometer) but how big a change is considered acceptable (if any). By my calcs this will mean the winter tyre/wheel combo will be 3.4% smaller in circumference leading to a speed difference of -2.3mph at 70mph? Any guidance?Posted 4 years agorichmtbSubscriber
976.1mm Vs 1009.7mm circumference by my calcs.
Its only slightly more than the difference in circumference you would get from brand new to worn tyres. I can’t see it being an issue to be honest so long as the load sand speed ratings are okay. And when you put the bigger wheels back on in spring the roads will come alivePosted 4 years ago
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