Sprockets and Chains

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All Rear Sprockets Made in the USA from Light Weight Aluminum
State Size and Tooth Count When Ordering

Triumph Overlay Sprockets: 530 56-60 teeth
Specify tooth count on original 43 or 46T

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BSA Overlay Sprockets: 530 56-60 teeth

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Triumph Stock Rear Sprockets: 530 46-52 teeth
Spool Hub - Pre-Unit/ Unit 500/ 650 1954-70 (8 bolt 1/4 in)
Conical Hub -650 1971-74 (5 bolt 1/4 in)
Disc Hub - 750 1976-on (4 bolt 3/8 in)

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BSA Twins Stock Rear Sprockets: 530 46-52 teeth
Crinkle Hub (10 bolt 1/4 in)
Conical Hub -650 71-72 (5 bolt 1/4 in)

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BSA Unit Singles Stock Rear Sprockets: 520 46-52 teeth
Crinkle Hub (10 bolt 1/4 in)
Conical Hub -650 71-72 (5 bolt 1/4 in)

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Rear Drive Chain 530:
Non O-ring Natural Finish

Rear Drive Chain 520:
Non O-ring Natural Finish

Chain Breaker Tool

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Factory Primary Ratio/ Final Ratio:

Triumph Pre-Unit 1.95 (22:43), 2.38 (18:43)

Triumph 500 Unit 2.23 (26:58), 2.26 (19:43)

Triumph 650 Unit 2 (29:58), 2.42 (19:46)

Triumph 750 Unit 2 (29:58), 2.35 (20:47)