ive stil got the orignal swinger somewhere but it need new bearings and looks a bit worse for wear so i bought a 2nd hand billetware one it cost me £100 quid
http://www.billetware.com/components...50fd21ec9c.jpg
just not sure if it will react aswell as the mx style on the track
ive got a 12 inch rear wheel but there is hardly any room left i think they were meant for 10 inch wheels