Drive sprocket

The drive  Stock Sprocket is also called the roller sprocket.

[1] Common size and basic parameters of the chain used commonly used P = 12.7 15.875 19.05 25.4

Dr=7.92 10.16 11.91 15.88

Number of sprocket teeth Z pitch P Roller outer diameter dr Row spacing pt division circle diameter d, d=p/sin180°/z

Tip circle diameter da,da=d+1.25p-dr or da=p(0.54+cot180°/z)

Root diameter df, df=d-dr