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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 

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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.

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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. 

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