The SpeedoDRD works you have to cut the plug and solder the wires it was about 10% with my kenda's. I like to know how fast or slow the mighty Zong is really going. Ride it first before you change sprockets it did not take me long to find out my zong was geared to high for me just going to 13th front sprocket was the single best thing i did for my to fast blue
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Peace and Zong Life
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