MTB 15, 18, 21 SPEED 116 LINKS. CHAIN TOOL REQUIRED TO SHORTEN THE CHAIN IF YOU NEED LESS LINKS. CHAIN CONNECTOR / SPLITTER TOOL IF YOU NEED TO SHORTEN THE NUMBER OF LINKS. INDEX BICYCLE CHAIN. WORKS WITH 5 SPEED, 6 SPEED AND 7 SPEED REAR GEARS.
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