Chain Chart

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

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. Part No. Pitch Roller Diameter Width Between Inner Plates Pin Diameter Pin Length Inner Plate Depth Plate Thickness
P d1 max b1 min d2 max L max h2 max t/T max
#25 115-5 6.35 3.3 3.18 2.31 7.9 6 0.8
#25H 115-84 6.35 3.3 3.18 2.31 8.9 6 1.04
BF05T 115-10 8 4.71 4.61 3.05 11.48 7.6 1.3/1.04
T8F 115-92 8 4.77 4.72 3.28 11.7 7.6 0.8
#35 115-83 9.53 5.08 4.77 3.58 12.4 9 1.3
#40 115-87 12.7 7.95 7.85 3.96 16.6 12 1.5
#081 115-19 12.7 7.75 3.3 3.66 11.2 9.91 0.9
#219H 115-4 7.774 4.59 5 3.01 11.9 7.4 1.2/1.04
#270H 115-81 8.5 5 4.75 3.28 13.15 8.45 1.8/1.4
#415 115-86 12.7 7.77 4.76 3.6 11 9.7 1
#415H 115-78 12.7 7.77 4.76 3.96 13.1 12 1.5
#420 115-85 12.7 7.77 6.25 3.96 14.7 12 1.5
#428 115-88 12.7 8.51 7.75 4.45 16.7 11.8 1.6
#428H 115-89 12.7 8.51 7.85 4.45 18.8 11.8 2.03
#520 115-66 15.875 10.16 6.25 5.08 17.5 15.09 2.03
#525 115-91 15.875 10.16 7.95 5.08 19.3 15.09 2.03
#530 115-90 15.875 10.16 9.4 5.08 20.7 15.09 2.03