How to balance the rear wheel

Guiding principal:
If a wheel can spin freely on an axle that is parralel to the ground,
then when the wheel comes to rest the heaviest point will be at the
bottom and the lightest point will be at the top of the wheel.

What you need to balance the Bros / Hawk rear wheel.

• M16 threaded rod.
• 3 M16 nuts and washers.
• I special Washer with dimensions: Outer diameter of 36mm and an inner
  diameter of 16mm (the washer should fit closely over the M16 threaded rod
  which may havea diameter of anything between 15.2mm to 16mm). The tickness
  of the washer is unimportant.
• An adaptor plate (description given below).
• 4 10mm dowel pins (M6 socket capped bolts with heads that are 9.8mm to
  10mm in diameter will do for these), nut and washers for same.
• A pair of cheap, un-sealed bearings with a 16mm shaft (17mm will also do).
• Electrical insulating tape.
• A simple stand to hold the bearings in place.
• Weights for the wheel (sticky weights will do).

How to make the adaptor plate.

• Use a 100mm square piece of metal, 3mm thick steel or 5mm thick aluminium.
  
• Drill a 16mm hole in it's center and four 6mm holes for the dowel pins
  (0.1mm accuracy required) (smaller dowel pins allows greater inaccuracy in
  the position of the 6mm holes). A small inaccuracy anywhere will cause an
  inaccurate balance of the wheel. With the wheel bolted into the spindle it
  should turn a true circle, so check it's runout, an excessive radial runout
  will seriouly affect the accuracy of the balance. You can get away with
  using only two dowel pins.
  
• Install the 10mm dowel pins into the 6mm holes.
  

If the bearings fit loosely ont the rod, use some tape to fatten up the rod.