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Drum-brake alternative to coaster-braked SRAM S7

(2 posts)
  • Started 4 years ago by Darkerside
  • Latest reply from crowriver
  • This topic is not resolved

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  1. Darkerside
    Member

    Hi folks

    Off the back of my gloriously successful ebike conversion, two friends have asked me to convert theirs. Much fun.

    However, one has a SRAM S7 IGH with a coaster brake. That ain't gonna work with a Tongsheng TSDZ2, because the clutch within the motor itself won't allow any non-drive direction pressure on the chain.

    The frame has no other brake-mounting options, so I think the only option is to swap that IGH for one with a cable-actuated drum instead.

    Any suggestions from the hivemind? Definitely looking at the cheap/cheerful end of the spectrum.

    Posted 4 years ago #

  2. crowriver
    Member

    Sturmey Archer XRD-5* can be had for not a lot. Reduces gearing to only 5, but a pretty wide range IIRC. Otherwise the XRD-8 costs a bit more but gives you 8 speeds.

    SRAM used to make hub gears with drum brakes but I'm not sure if you can get hold of them nowadays.

    * - RX-RD5 slightly less, not sure what the difference is in specs but seems to be 135mm OLD compared to 130mm on the XRD-5. There's also a 90mm drum brake RXL-RD5 but I can't find a stockist for it...

    Posted 4 years ago #

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