Every gear inch counts when towing 100lbs of dog and trailer with my Expedition with it's 26" rear tire. Upgrading to a 10 speed cassette gave me an extra gear inch on the low end. To get my gear inches lower and get back some of the lost gear inches on the high end I would have to go to an internal gearing mechanism like the Schlumpf drive. Right now I prefer a setup that is user and local bike shop friendly if a repair is needed while on the road.
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