• That sturmey 3speed rotary disc hub looks like a winner for urban/city riding to me. Cassette joint (a la Alfine) so no gubbins outside of the chainstay, 177% range, 500g less than Alfine8sp and middle gear is direct drive so gear it cleverly and you have an efficient singlespeed with a downhill and climbing gear.

    http://www.sturmey-archer.com/en/products/detail/rs-rk3

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