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Here is a detailed comparison
The thumb shifter is straightforward to use, though its not as refined as trigger shifters found on higher-end bikes
Highest torque to displacement ratio of any other motorized bicycle kit
It worked fine for me, but if you have an odd-shaped noggin you might not be so lucky
US$ 23.62
US$ 28.51
US$ 20.73
US$ 22.41
US$ 28.63
US$ 20.76
US$ 20.99
US$ 26.89
US$ 28.28
US$ 23.41
US$ 28.20
