Measure your inside leg, bottom of heal to absolute top of your leg and times it by 0.62 and you'll have your ideal frame size in inches, times by 2.54 to get cm, and match it up.
@Fat_Pants started
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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Measure your inside leg, bottom of heal to absolute top of your leg and times it by 0.62 and you'll have your ideal frame size in inches, times by 2.54 to get cm, and match it up.