When I bought my new MERIDA SPEEDER 400 I bought two spare tyres and some spare tubes just in case you wreck your tubes and existing tyres while you are riding anywhere up to 60km distance (at present)...As I think the Maxxis tyres are real good value for money and a very strong tyre which can handle any conditions on the road I didn't have to ask the staff to tell me all about the tyres all I had to do was ask if they had one which they did...so now I have two tyres and I am all set to be able to ride anywhere.