Chain Chart

Use the image below to guide you in measuring your chain. 

Chain Dimensions (in millimeters)

It's best to have a metric ruler or calipers to measure the small differences in size. The #35 and #40 are most common on large pocket bikes, mopeds, mini bikes, go karts and choppers. The #25 and #25H is most common on electric bicycles, electric scooters and the small 47cc pocket bike. If you need help you can chat with us or call us during normal business hours.

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
T8F8.004.774.723.2811.77.60.80
#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
#41012.707.773.183.608.658.301.00
#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