Which CLUG size do I need?Updated a year ago

The critical measurement is your ACTUAL tyre width as opposed to the manufacturers' stated tyre width. If you don't own a pair of callipers you can use the method demonstrated here.  Armed with this measurement choose the CLUG with the appropriate range. There is an overlap between some CLUG sizes - always go for the smaller CLUG size for a snugger fit. A tyre stated to be 2.4” will often measure 2.2”. If your tyre width is 2.2 - 2.4", CLUG mtb will be a better fit than CLUG XL.