28 Small Output Gear am-0139

Material: 4140 steel, cold rolled
Teeth: 28
Diametric Pitch: 20
Pressure Angle: 14.5
Face Width: 3/8 inch
Bore: 0.874 inch, with dog pockets, for pressing in the FR6 bearing

Intent: The purpose of this gear is to be located on the shifting shaft of an AndyMark transmission (AM Shifter, Super Shifter). It is to be paired with a 35 tooth Medium Cluster Gear.

This 28 Small Output Gear and the 35 Medium Cluster gear replace the standard set of Small Output Gear (35 tooth) and Medium Cluster Gear (28 tooth) on AndyMark transmissions.

Gear ratios:

35 Medium Cluster Gear : 28 Small Output Gear -> 4:1 ratio between high and low gear on an AndyMark transmission (AM Shifter, Super Shifter)

The standard ratio for these same transmissions are 2.56:1.

This gear provides a TALLER ratio between high and low gear on these transmissions.