i have recently got some sas's for my specilised p1 07. i am currently using hex scewers. the front wheel is riding perfecty but the rear keeps slipping when ever i break of press hard on the peddles. i did manage to get the scewers tight enough that they didnt slip but the snapped afret a few mins. has any one got an idea of any axles i can use that are may be double nutted or something?? any sugestions welcome. thanks the dirt jumper