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Hey guys! Just wanted to jump on and say the 39 tooth rear sprocket(JT 279.39) has transformed my bike for the better! With the stock 42 tooth i would be at about 7000-7200 rpm at 65mph (im a big guy 6’1” 240lbs) now with the 39 tooth I’ve dropped to about 6000rpm at 65mph. It also helped lengthen the very short gearing on this bike while still having plenty of grunt. I would highly suggest this mod to anyone who rides their bike faster than 55mph for any length of time.
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