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3 Speed Dahon

asprillaasprilla Posts: 8,440
edited December 2014 in Commuting general
Anyone got a three speed Dahon that uses an external dérailleur?

What's the cassette like; are the sprockets separate and does it fit on a standard Shimano / Sram spline pattern?

I've got a Brompton S2L and I want to improve my gearing. It's currently 13/16 with a 54t chainring, but based on my single speed gearing I want 11/14 (I never use the 16). Now at the moment my only option is filing down the 11t end sprocket from a Shimano cassette which I've started doing, but it's slow progress so I was wondering if I could use the 11t from the middle of the 9/11/13 Dahon set-up.

Cheers for any help.
Mud - Genesis Vapour CCX
Race - Fuji Norcom Straight
Sun - Cervelo R3
Winter / Commute - Dolan ADX

Posts

  • t4tomot4tomo Posts: 2,643
    You must have a pretty flat commute.

    You can get a 12 tooth sprocket for brommies:

    http://www.simpsoncycles.co.uk/product/2270/brompton-12t-rear-sprocket-shimano-spline-fitting

    I think the 2 speeds are shimano splines.
    Bianchi Infinito CV
    Bianchi Via Nirone 7 Ultegra
    Brompton S Type
    Carrera Vengeance Ultimate Ltd
    Gary Fisher Aquila '98
    Front half of a Viking Saratoga Tandem
  • asprillaasprilla Posts: 8,440
    It London, flat as a pancake.

    Yeah, 2 speed brommies use Shimano splines hence I'm adapting an 11t from a Shimano cassette. I think it's going to be in vain though so I'll probably end up going 56/12, which is quite close to what I want.
    Mud - Genesis Vapour CCX
    Race - Fuji Norcom Straight
    Sun - Cervelo R3
    Winter / Commute - Dolan ADX
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