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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@Zippie
Fixed wheel means that the gear ratio is set by the size of the drive wheel - there is no chain - the cranks are attached to drive wheel - think penny farthing etc. The circumference of the wheel is the gear size in inches.
Fixed gear is where the cranks attached to a chain ring which then powers the driving wheel by it being attached to a fixed sprocket. The gear size is calculated by chainring teeth/sprocket teeth x driving wheel's circumference.