I bought a spare wheel and tyre for my Mazda 3. The normal tyres fitted are 205/60 R16 92V and the recommended temporary spare tyre is specified as T125/70 D16 96M.

I knew that the temporary tyre was smaller as my handbook informs me that the ground clearance is reduced by about 10mm, but the difference between the temporary and the normal tyre is 60mm in diameter which seems excessive. My local Mazda dealer assures me that this is in order, but I'm not convinced.