Join Date: Apr 2008
Location: Western New York, The FingerLakes Region, small town, Bloomfield, NY
Bikes: 2008 Currie eZip Trailz, 1971 Raleigh Super Course, bought new for Honeymoon camping trip around Nova Scotia
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I guess anything is possible, but these systems only increase chain tension by a factor of two. They MATCH the force the rider applies, doubling it. It's a poorly maintained bike that doesn't have a safety margin for that. What if a 250 lbs person got on your bike?
Not to criticize the injured but that bike was an accident waiting to happen. I'd like to think that for steady force a factor of ten bigger than mine wouldn't break anything on my bikes.
The Sunstar is 250 Watts of energy efficiently applied. The eZip is 450 Watts of energy. If energy is bad the eZip is more fearsome. To complete the thought, a good athlete can put out 200 watts of energy , so if a system like this doubles it, the energy is 400 watts, that's while the eZip is applying 450 watts. And because the rider with Sunstar can switch to lower gears, to a big chainwheel in back, the chain tension is lower for a given hill.
Last edited by donob08; 09-11-09 at 08:38 PM.