Rotator Gearing

Gearing using bike parts. The desirable gear ratio to allow for 360 (plus a little) rotation.

Possible Gearing Ratios

Teeth per larger cogs:
48
38
28

Teeth per smaller cogs
28 X 2.5 = 70
24       = 60
21       = 52
18       = 45
16       = 40

Gear ratios near 2.5:
38 to 16 = 2.375
48 to 28 = 2.667 
48 to 17 = 3.000