right, i was backhopping setting my self up to do and gap and when i kicked it felt i done a wheel spin before i went off the edge. but i didnt give it any more notice and carried on riding. next minute i was pedalling and and my bike didnt move!! my cranks just turn but nothing happened, my freewheel didnt moving or anything. had a closer looker and i realised my ffw cranks threads are knackered. BUT!..... i am hoping its the freewheel and not the cranks i know my freewheel isnt loose becuase i tried tightening it and its an ACS claw welded so i really hope the threading has gone in the freewheel and not the cranks. i also found a threaded peice of metal strip around the bottom bracket, this means the threading has gone. has anyone else had this problem the cranks im using is the echo 2005 ones with an ACS claw. if it was to be the threading has gone on the cranks, can i get warranty? thanks JK