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 Please note: an early Skyteam or Jincheng can be supplied with a sprocket with 4 cams instead of holes! 
 Select the correct rear sprocket! 
 Consists of: 
 - Japanese quality DID chain. 
 - Front sprocket 13. 
 - Rear sprocket 42. 
Tip: Locking plate type 3 (1040080064) fits for this front sprocket.