Model/Shaft Size:
Model 80-200: 30 mm shaft (slight additional charge for this shaft size only). NOTE: 80-200 may require the use of a longer threaded shaft depending on style of wheel being mounted.
Model 80-303: 40 mm shaft
Recent Production Bear Balancers:
Years 2003- Early 2006: 36mm shaft (must be special ordered)
Years Late 2006 - July 2009: 40mm shaft.
Cartek Balancers:
Mid-2009 to present: 40mm shaft.