A customer brought me a 2007 BD Mastiff,rigid frame w a 2:30-16/15 rear tire and solid aluminum wheel.The customer had a shop in another town put on new tires and wheel bearings.he rode it about 150 miles and the sprocket bolts backed out.One hit the frame and luckily snapped off instead of locking things up.Here is what it has-the wheel/hub uses two bearings and an internal spacer.On the sprocket side there is a big spacer,approx 1.35 od x 1.1 ' long that is machine down on one end to kind of snap on top of the hub bearing.the inside diameter is axle od size.Then there is an aluminum collar that is counterbored to fit tightly onto a flange on the wheel hub.The spacer goes through this piece.Then the sprocket goes onto a machined protrusion on the aluminum collar.The last piece is another aluminum collar w countersunk bolt holes for the allen heads that bolt everything together.This collar also has another bearing,no doubt for extra support.Here is my question.is there some kind of a thin spacer that goes inside of the outer collar to center it? Maybe the bearing in it centers it.also,the first aluminum collar is eggholed prob from running loose so the bearing spacer can wobble around.Sure like to see a diagram.
2007 Mastiff rear wheel woes...
- Thread starter KenMt
- Start date
Manuals are below in my signature,. Post a couple pictures, might help. Doesn't sound stock.
After some more study of the situation,I'm pretty sure how and why it happened.The chrome 7/16: nc allenheads holding the whole assembly together only had 1/2" thread protrusion-enough for steel but not aluminum.The chrome bolts were not only too short,they had no shank between the head and the threads.I measured the thread hole depth in the hub,which was 1.2".I got longer black allenheads and cut them off to allow 1' thread protrusion.these bolts also have long shanks,which along with the countersunk holes for the allen heads do a great job of centering that outside hub.I do have another question-what should I torque those allenheads to?[going into aluminum remember] i plan on test torquing everything first to make sure helicoiling isn't necessary,then re disassemble,clean and prime then use medium strength loctite and retorque. Thanks for the quick answers guys. KM