The Altus M313 derailleur was a great replacement for my sons Trek MT220 which uses the SR Suntour XCM derailleur. The Altus worked well with a set of SR Suntour "Unified" XCM cranksets with three sprockets and 3/32 inch chain. It has been fitted with Shimano EF51 rear derailleurs/brake levers to replace the original clutch derailleurs. If you've spent some time trying to figure out what parts fix your kid's bike, I hope this helps.
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