Is there not a nut in the other side? I know on the dirt bike wheels there is but with these which look like a cast they may be threaded direct into the casting. Best way I can think of if to insert an Allen wrench and spot weld it to the bolt head. Unthread it and replace with new.
Originally Posted by Paulemery
Its an M8 hex bolt head that has sheared, I was only using a hand Allen key but still managed to screw myself,