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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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@Alkali
my GF's bike has biopace rings and they're horrible, feeling 'choppy' (stupid description, but the uneven feel when pedalling is best summed up this way) though the pedal stroke. Bizarrely she doesn't notice it, but to me they're weird and of no real benefit.