My Cranbrook is now 4G equipped. Originally had a 56t sprocket which climbed good but slow. Now the cranbrook has a 48t. Still climbs good and top speed is almost 29mph. Bike does what i want it to. 200+ trouble free miles since the installation of the 4G. The Grubee HD axle is great. I have a manic mechanic worksman wheel [11gauge] with the manic sprocket adapter that is on the way. At last a dependable motoredbike.
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