Chain Chart



Chain Chart

Chain Dimensions (in millimeters)

The #35, #40, and BF05T are most common on large pocket bikes and choppers. The #25H is most common on scooters and the small 47cc pocket bike. Refer to the chart and image below to identify your chain.

Chain Dimensions (in millimeters)
Chain No.PitchRoller DiameterWidth Between Inner PlatesPin DiameterPin LengthInner Plate DepthPlate Thickness

Pd1 maxb1 mind2 maxL maxh2 maxt/T max
#256.353.303.182.317.906.000.80
#25H6.353.303.182.318.906.001.04
BF05T8.004.714.613.0511.487.601.3/1.04
#359.535.084.773.5812.409.001.30
#4012.707.957.853.9616.6012.001.50
#08112.707.753.303.6611.209.910.90
#219H7.7744.595.003.0111.907.401.2/1.04
#270H8.505.004.753.2813.158.451.8/1.4
#41512.707.774.763.6011.009.701.00
#415H12.707.774.763.9613.1012.001.50
#42012.707.776.253.9614.7012.001.50
#42812.708.517.754.4516.7011.801.60
#428H12.708.517.854.4518.8011.802.03
#52015.87510.166.255.0817.5015.092.03
#52515.87510.167.955.0819.3015.092.03
#53015.87510.169.405.0820.7015.092.03