Originally Posted by spokenword
On a fixed wheel, the momentum from the wheel is also assisting on your upstroke, while gravity is still providing the same boost on the downstroke as on a freewheel bike, which is why your body would do less work and your HR drops.
interesting theory / take on fixed riding vs geared riding
(warning, its a PDF)
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So long. Been nice knowing you BF.... to all the friends I've made here and in real life... its been great. But this place needs an enema.