Bikes that have no gears/shifters, and no freewheel - the pedals are always spinning when the bicycle is moving. Note that fixed gear is not the same thing as singlespeed, which has its own tag.
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Fixed Gear Chainring Centering
I have a fixed gear bicycle with a chain that gets periodically tight and loose as I complete a rotation of the pedals. How do I center my chainring so that the chain has even tension throughout?
