Information on Number of Teeth

The selection of the number of teeth of the sprocket should follow the below listed recommendation:

• < 11 not for power distribution.
• 11 to 13 only for chain speeds < 4 m/s or 13.12 ft/s.
• 14 to 16 only for chain speeds < 7 m/s or 23.03 ft/s.
• 17 to 26 recommended number of teeth for small sprockets.
• 38 to 76 recommended number of teeth for larger sprockets.
• > 120 teeth possible, however only recommended for special cases were necessary.

A number of teeth less than 15 should not be selected for maintenance free chains.

According to DIN 8196 the following number of teeth should be preferred: 17, 19, 21, 23, 25, 38, 57, 76, 95 and 114.

D1 and D2 are the pitch diameter of the driving sprocket (Z1) and of the driven sprocket (Z2) after selection of the chain type.