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Chain Info
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.
| Name | P | d1 | b1 | d2 | L | H |
|---|---|---|---|---|---|---|
| 25 | 6.35 | 3.3 | 3.18 | 2.31 | 7.9 | 6 |
| 25H | 6.35 | 3.3 | 3.18 | 2.31 | 8.9 | 6 |
| 219H | 7.774 | 4.59 | 5 | 3.01 | 11.9 | 7.4 |
| BF05T | 8 | 4.71 | 4.61 | 3.05 | 11.48 | 7.6 |
| 05B-1 | 8 | 5 | 3 | 2.31 | 8.2 | 7.1 |
| 35 | 9.525 | 5.08 | 4.77 | 3.58 | 12.4 | 9 |
| 40 | 12.7 | 7.95 | 7.85 | 3.96 | 16.6 | 12 |
| 170GSX | 12.7 | 7.75 | 6.45 | 3.96 | 14.8 | 11.5 |
| 81 | 12.7 | 7.75 | 6.45 | 3.96 | 14.8 | 11.5 |
| 420 | 12.7 | 7.77 | 6.25 | 3.96 | 14.7 | 12 |
| 428 | 12.7 | 8.51 | 7.75 | 4.45 | 16.7 | 11.8 |
| 428H | 12.7 | 8.51 | 7.85 | 4.45 | 18.8 | 11.8 |
The table above uses millimeters but if you need to convert millimeters to inches just divide by 25.4
