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Another question asked before...Sherer
Has anyone checked out this site?
www.SHERERUSA.com He sell a trike with a human powered drive train that he claims is far more efficient than chain rings. I have some interest in this because it can also be adapted to someone whose right and left side are radically different in strength and endurance (which is my case exactly). I'd be curious what all of you think about this thing. Jeff |
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Another question asked before...Sherer
Jeff Grippe wrote:
Has anyone checked out this site? www.SHERERUSA.com He sell a trike with a human powered drive train that he claims is far more efficient than chain rings. I don't believe him. His main selling point is more leverage, but leverage is a two-edged sword: if you can move the thing anyway then ISTM that more or less leverage is just fiddling with the gearing, which it's easy enough to fiddle using chainrings. *Efficiency" will be about the losses in various linkages and biomechanical limitations, and I can't see he's got anything special there. Furthermore, since the *efficiency* won't actually be better AFAICT, the fact that one can easily push out one's aerobic limit through a conventional crank makes fiddling with the effective gearing moot. Anyone using these to coast to victory in HPV races with "3.5 times the power" of everyone else? If they aren't then I suspect snake oil is being sold. I have some interest in this because it can also be adapted to someone whose right and left side are radically different in strength and endurance (which is my case exactly). Have you tried a shorter crank on one side? Might help... If you're not doing so anyway, clipless pedals will let you use more power more evenly Pete. -- Peter Clinch Medical Physics IT Officer Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital Fax 44 1382 640177 Dundee DD1 9SY Scotland UK net http://www.dundee.ac.uk/~pjclinch/ |
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Another question asked before...Sherer
On Wed, 17 Jan 2007 18:52:00 -0500, "Jeff Grippe"
wrote: He sell a trike with a human powered drive train that he claims is far more efficient than chain rings. I have some interest in this because it can also be adapted to someone whose right and left side are radically different in strength and endurance (which is my case exactly). I'd be curious what all of you think about this thing. Well, it doesn't get rid of chainrings, it gets rid of crankarms. I would be careful before I purchased it. First of all, he is not the first to use lever action instead of crank arms. You can find trikes and quads from the 1800s with levers (mostly the early Sociables). Most didn't go to the literal lengths this person does because they don't seem to fit the efficiency of the average human being. And lever arms don't solve imbalance better (although they may fit a certain person better). Crankarms on a trike with clips allow better compensation and smoother travel than fiddling with different lever lengths - especially as you travel over varied terrain. If you can try one over varied terrain, fine. Otherwise, talk to the trike and quad people. All just my opinion. Curtis L. Russell Odenton, MD (USA) Just someone on two wheels... |
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