silvergull wrote:Hi, 400 refers to the imperial width, so a 400 is approx 4" which in turn is about a 100 to 110 metric. no idea why the Pirelli mt43 is still sized that way. Using a narrower tyre can give you more grip in certain conditions, and are more interchangeable with other bikes if you wanted to re- use the tyre that way. But you need really to match fhe rim width to tyre size, to get the optimum profile. I think an xr 250 will take a 120 width . GTC will fit them for you. Its a very personal choice, with much experimentation needed. cheers bc
Ok many thanks again