Bigbob Posted July 26, 2021 Report Share Posted July 26, 2021 Ive got the chance of a set of 225/65R17 instead if the ones on the truck 255/65R17 will they fit ? will it make much difference as im only planning on running it on them till the mot in october Quote Link to comment Share on other sites More sharing options...
Jim Neal Posted July 26, 2021 Report Share Posted July 26, 2021 I'm not an expert but I'd guess the tyres you're looking at are 30mm narrower than your wheel rims and therefore wouldn't fit. Quote Link to comment Share on other sites More sharing options...
TR1 Posted July 27, 2021 Report Share Posted July 27, 2021 While they will fit you need to consider the effect on the speedo which will be inaccurate (over reading) and road holding. Also if that tyre size is not a standard fitment for the vehicle type then your insurance would need to be notified or may be invalid in the event of an accident. Take a look on wheel-size.com , you can search by vehicle make / model. Quote Link to comment Share on other sites More sharing options...
Smokersmith Posted July 27, 2021 Report Share Posted July 27, 2021 1 hour ago, TR1 said: need to consider the effect on the speedo which will be inaccurate (over reading) Help me understand why tyre width would affect Speedo reading please? Quote Link to comment Share on other sites More sharing options...
Rewulf Posted July 27, 2021 Report Share Posted July 27, 2021 21 minutes ago, Smokersmith said: Help me understand why tyre width would affect Speedo reading please? Tyre width affects profile, hence speedo. It's a percentage of, but I can't remember the calculation. Quote Link to comment Share on other sites More sharing options...
RoBeRt1990 Posted July 27, 2021 Report Share Posted July 27, 2021 (edited) The new tyres would be roughly 40mm taller than the old Edited July 27, 2021 by RoBeRt1990 Quote Link to comment Share on other sites More sharing options...
Rewulf Posted July 27, 2021 Report Share Posted July 27, 2021 41 minutes ago, RoBeRt1990 said: The new tyres would be roughly 40mm taller than the old Surely they would be shorter if hes gone down in width ? Quote Link to comment Share on other sites More sharing options...
RoBeRt1990 Posted July 27, 2021 Report Share Posted July 27, 2021 34 minutes ago, Rewulf said: Surely they would be shorter if hes gone down in width ? Apologies your correct I read it the other way round they'd be 40mm lower Quote Link to comment Share on other sites More sharing options...
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