Mounting Jockey Wheels on a boom.

• All of these examples use the same size tubing or next size up as what they're mounted on. The strap is made by cutting about a 40mm wide piece of the large tubing. Weld on a small tube along with a nut at the end of that tube. Alternatively use a long nut.
  
  
  

  Split both tubes with a metal saw to make the clamp gap. If using the long nut, drill out the thread on the side with the longest tubing. On a few occasions I've found I needed to split the tubing first and open the gap a little before welding on the mount tube.
  
  
  
  

  1. Using 2 wheels on different sides. See pic 1, pic 2, pic 3 and drawing. I mount the wheels close enough to capture the chain so it can't jump the groove.
  2. Using a mount on both sides See pic 1, pic 2 and drawing
  3. Using a single mount on one side. (Will work best if the clamp can be slid on the boom as bending it open to get on a boom may end up splitting the clamp. See pic and drawing

• Using an exhaust bracket. The jockey wheel/s could be placed on the mount bolts instead of the centre of the bracket if required.

• On the WISIL site - Making a tube clamp.

• Recumbent bicycles - Not a tube clamp but a way of mounting jockey wheels.

• Dave Barrett's Econobent Saga

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Thursday, 29 January 2009