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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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@gbj_tester
Expensive, bad handling due to high unsprung weight, need complex linkages to eliminate shaft reaction ("jacking up"), yet another set of seals/gaiters to fail and dump oil on your tyre, lower transmission efficiency than roller chain, all but impossible to alter final drive ratio to suit different race courses, difficult to package for optimum weight distribution and swing arm length, greater width than roller chain final drive compromises cornering clearance and/or footrest placement, choice of second bevel drive in gearbox (bulky, heavy, expensive) or longitudinal crankshaft (difficult to package, engine torque reaction causes roll instead of pitch)