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Warranty: TUMI Limited Warranty
The difference is the sensors and how they work." There are various methods to activate pedal assist, the simplest being a cadence sensor , which detects the speed at which you pedal
In any event, I could not feel any discernible difference between opened and closed with no beneficial ventilation being felt whatsoever
Turns out, it was really small, so I sent that one back and swapped it for the next size up - small
US$ 27.99
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