Installing Schlumpf

Discussion in 'Cycling Archive' started by Nick Maclaren, Oct 20, 2015.

  1. Has anyone installed a Mountain Drive, or got someone to do it? In
    either case, any experience would be welcomed. I don't think that I
    can get away without extreme gearing on a recumbent trike, and am
    converging on Rohloff + Schlumpf.

    Yes, out of spec. But this is me, not a ruddy TdF rider! I suppose
    that I might, in theory, be able to overload it if I try pulling out
    tree stumps ....
    Nick Maclaren, Oct 20, 2015
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  2. In uk.rec.cycling.moderated on Tue, 20 Oct 2015 20:21:31 +0000 (UTC)
    Tools are needed. It can be home done but unless that is your thing
    and you can hire the tool, best get someone else.

    When my LBS did mine I think they borrowed the tool from Greenspeed.
    Spec your gearing carefully as my experience is that the MD makes
    standard derailleur gears feel mushy and hubs feel very mushy.
    Rohloffs are said to cope better than Shimano, but still you want to
    spend most of your time in direct drive especially as you prefer lower

    When you are hill grinding you are going to want to be steady at 70 or
    more I think. I didn't have a cadence meter so can't be sure but I
    think I was feeling uncomfortable putting any force into it at under
    that. Very energy sapping. So no mashing. But once I got the RPM up
    some I could grind for a fair way.

    Greenspeed are recommending SRAM dual drive with derailleurs and 3
    rings up front to get a wide range these days.

    Zebee Johnstone, Oct 21, 2015
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  3. Nick Maclaren

    Tosspot Guest

    Yes, I had it installed on the Anthrotech with a Rohloff. You need a
    special 45 degree cutter if you want to do it DIY. I contacted Schlumpf
    and got them to order the BB casing for the trike, machine it, and
    deliver the BB case+Schlumpf drive as a unit.
    I went the other way around (I think) and made the low gears direct, and
    the high gears, ermm, geared, and it worked well. In fact I'm just
    wondering how to get the Schlumpf onto the cargo bike.
    Tosspot, Oct 21, 2015
  4. In uk.rec.cycling.moderated on Wed, 21 Oct 2015 20:45:06 +0200
    Yeah, I suspect for heavier things like velomobiles and touring trikes
    the speed drive is the go. Direct drive when you want to put the
    power in and geared drive when you are topping up speed rather than
    pushing hard.

    Zebee Johnstone, Oct 21, 2015
  5. Yes. I very much took your comments on board. I would be leaving the
    Schlumpf in direct-drive all of the time except for steep hills. The
    Rohloff range is fine for everything except those.

    And I am going to check on how much it would cost to have two booms,
    which would make it easier to fit the Schlumpf.
    The killer is that, at below 100 watts, I need a ridiculously low gear
    for that - 4" for the steepest unavoidable hills in the UK. I would
    need a Pinion + Schlumpf for that, and WOULD be able to destroy the

    I have thought of several ways that I could produce such a gearing
    system, but all need serious engineering work. One such possibility
    would be a 2-speed rear hub, with a (very) direct drive and 4:1
    step-down, rated for top athletes in tandem. Combine that with a
    Pinion ....
    Yes. I really don't want the hassle, and all the disadvantages of
    both hub (minor) and derailleur gears.

    Nick Maclaren.
    Nick Maclaren, Oct 22, 2015
  6. Nick Maclaren

    kimble Guest

    'Tigerbiten' over on runs such a setup, in order to be able
    to maintain a constant power output uphill as well as downhill with a
    hefty touring rig. IIRC he added a double chainring and derailleur
    because the spread of gears meant he was having to make frequent shifts
    on the Schlumph in the cruising range.

    I expect that on a tadpole recumbent the tyre will slip well before
    anything gets damaged.

    kimble, Oct 22, 2015
  7. Nick Maclaren

    Tosspot Guest


    What trike is it?
    Tosspot, Oct 22, 2015
  8. Thanks. Several people on bentrideronline do, too. The only way I am
    going to find out how I like it in practice is to use it! Expensive, but
    that's how it goes.
    In bottom gear, certainly. My estimate is that it wouldn't reach its
    limit in bottom gear until the slope is 1:1.2 :)

    Nick Maclaren.
    Nick Maclaren, Oct 22, 2015
  9. It's going to be an ICE Adventure HD 26" with rear suspension.

    Nick Maclaren.
    Nick Maclaren, Oct 22, 2015
  10. Nick Maclaren

    Tosspot Guest

    Hmmm, that boom looks a bit expensive. Contact the factory, see how
    much another one is, or, send the original off to Schlumpf who will do
    it for you and send it back with the drive fitted.

    'Course, that means time without :-(
    Tosspot, Oct 23, 2015
  11. Thanks. I am writing a (hopefully) final set of questions, of which
    that is one. I hadn't though of getting it installed by Schlumpf, so
    thanks very much. That would be by far the best solution!

    Nick Maclaren.
    Nick Maclaren, Oct 23, 2015
  12. Nick Maclaren

    Mike Causer Guest

    ICE are IME very helpful. Ask and I'm sure they can sort it out for

    Mike Causer, Oct 23, 2015
  13. Nick Maclaren

    Tosspot Guest

    Schlumpf were very happy to order BB case from Anthrotech on my behalf,
    fit the drive and send it on to me.

    Which is causing a headache for the cargo bike, as I'd forgotten that
    was how I'd[sic] solved the problem. Now, of course, I'm in Mikes boat.
    I'm thinking to order the squidgy cutter bit and do it myself, as I
    obviously can't send the entire bike off to Schlumpf. Ok, I could, but

    Bit of a poser atm.
    Tosspot, Oct 23, 2015
  14. Nick Maclaren

    Owen Dunn Guest

    That sounds so much like a performance improving drug.

    Owen Dunn, Oct 24, 2015
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