Recently bought a used 20" Trek MT60 for my daughter. Although it is a "mountain" bike, its not geared for going up them. The big first gear on this freewheel made this bike so much easier for her to pedal. The Sram 3.0 derailleur did take some tweaking to get it to shift smooth.
I was trying to make my 5 year old son's bike a little better, especially when he turned 6 and was ready to follow me on se easy dirt trail rides. Every time we hit a hill, he had to get off his bike, and he burnt out quick. He needed an easier gear for the hills. I was worried this wouldn't work and make the jump to the 34 tooth cog, but with a little tuning on his 6 speed derailleur, trimming a bit of the shifter cable housing to shorten it at the rear DR, it works perfect! Best upgrade we made to his stock 20" hot rock, besides maxxis snyper tires.
PROS: Durable, Enhances Pedaling Efficiency, Easy To Install
Bought this to rebuild my sons first MTB a few years ago. It worked. The bike has been handed down twice since then and I havn't heard of any problems. I didn't expect too much from it so I wasn't disappointed. I wasn't too concerned with weight or durability as I just wanted the bike to work... and it did.
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