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London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
@Velocio
Front hub around 7 cm (giving a 22cm circumference for a very tight fit).
Rear hub 8.5 cm (giving a 27cm circumference).
These are pretty fat hubs.
The shiners need ample space for them to fall and spin around, so I was estimating an extra 8 cm of circumference a piece.