Urm 16-13 its a bit gash, got all the tools to put my 12t sprocket on but I'm too busy riding to stop for too long!!! In short amazing, sold my mod and my BMX to get this and it does just everything I could want and more! just made riding really fun and exciting again for me! Yea lol Just ran stupid high PSI and a DH tube 2nd time round and it protected my sidewalls a lil more!!! lol ok trying to sort that now will be sorted in an hour or so, and big up Joe for the filming, rick and others who know who they are