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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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hollow__legs
For BR events (including DIYs and perms) min avg speed
200 to 600 km – 14.3 kph - 15 kph - perms & DIYs at 14.3, organisers can chose to run min speed at 15
700 to 1200 km – 13⅓ kph
1300 to 1800 km – 12 kph
1900 to 2400 km - 10 kph
2500 km and over – 8⅓ kph
The maximum speed limit is usually 30 kph
For BRM events:
200 km = 13 hours 30 minutes
300 km = 20 hours
400 km = 27 hours
600 km = 40 hours
1000 km = 75 hours
More info here: https://audax.uk/about-audax/classifications/