Not sure what size your tyre is?

Look at your tyre. You’ll see a set of numbers as shown below. You want to look at the FIRST number – shown here as 195. If your tyre is a 195, then you’ll need Clamp C.


  • Clearance between the tyre and the wheel arch needs to be about 40mm.
  • To check, get a tape measure and pull out 40mm.
  • Next, hold it around the top edge of the tyre between it and the wheel arch as shown here.