Quote:
Originally Posted by Gdeaver
This is our plactraction wheel set up for dead axle. May help.

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Very nice CAD drawing! Just to make a few design suggestions that we use in our wheel design:
We use a flanged bearing in the sprocket rather than the wheel hub to gain a little wheelbase on the dead axle. Spacer bushings outboard of the flanged bearing will provide chain clearance and retain the bearing in the sprocket.
Rather than nuts or standoffs on the hub to space the sprocket, we make a spacer ring of aluminum or Lexan that centers on the wheel hub similar to what was provided in the kit with the Skyway wheels. We make a thin ring of aluminum or Lexan for the other side of the wheel to act as a washer under the bolt head.
We re-drill the sprocket mounting holes with tapped 10-32 or 8-32 holes, and then use jamb nylon nuts to give a "double nutted" assembly.
We have used only (3) 8-32 sckt hd bolts in this wheel assembly with no failures. It's also prudent to check these bolts in the pit to ensure they remain tight.
The bottom line is that I suspect that bolts/nuts are loosening, and with the continual reversing that occurs between the sprocket and the wheels, shear and tensile loads are applied to the bolts. Just my nickels worth.
