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520 vs 525

8K views 7 replies 5 participants last post by  vabarber2 
#1 ·
Well am getting ready to buy a new sprocket i believe the kid i bought the bike dropped one tooth in the rear i was actual looking to go up 1 tooth in the rear.. well 1st should i just get a new chain with the sprocket and/or if just changing the rear sprocket how can i tell the difference between a 520 chain and a 525
 
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