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  1. #1
    ridin' Mary
    Reputation: OhNooo's Avatar
    Join Date
    Jan 2007
    Posts
    325

    Rohloff Speedhub - push the limits?

    Hi Folks,

    I'm brand new to the Rohloff Speedhub club as I just recieved mine yesterday. This is the first time I've gone through the manual in detail, and I'm tempted to lightly push a few of the limits. I'm wondering if I'll get into trouble...

    Gear Ratio must be more than 38t/16t:
    I can find good SS 36t chainrings, but 38t ones are harder to come by. I already have a Surly 36t chainring on order. The Speedhub comes with a 16t cog, and I'm wondering if I really need to get a 38t chainring instead, or if I must replace the cog with the 15t cog. Is anyone running with a 36t/16t combination without problems? I'm 180lbs (borderline clyde) if that matters. I'm also more of a grinder than a spinner, so I'll be putting some torque on the cranks.

    Use Speedbone only if dropouts are machined into same piece as brake mounts:
    I've seen pictures of Rainman's SIR9 that have brake mounts welded onto the seat stays, so I've seen at least one case where this is not followed. My Mary SS has a much longer weld on the seat stay to hold the brake mount than the SIR9, so I'm assuming this rule is safe to push. Is this common to bypass this rule?

    Use Speedbone only if there is 6mm radius on metal around brake mounts:
    I measured the brake mounts on my Mary SS, and they total 11mm in diameter. Using the rule, I should not use this unless the tab that sticks out for the brake mount has 12mm diameter of metal around the brake mount holes. Again, should I be worried?

    Thanks in advance for any guidance!

  2. #2
    Reviewer/Tester
    Reputation: Rainman's Avatar
    Join Date
    Apr 2004
    Posts
    6,205
    I'm currently running 36/16. No problems. You would have to have legs like Superman to kill the Rohloff with this gear ratio, imo.

    I mounted the Speedbone directly onto my One Niner and SIR 9 brake mounts, no problems.

    You shouldn't be worried.


    Enjoy the Rohloff Speedhub. It's a really sweet, sweet setup...


    R.
    It is inevitable ...

  3. #3
    Music & Bikes
    Reputation: fokof's Avatar
    Join Date
    Apr 2006
    Posts
    926
    same here , I run my SHub with 36/16 no problems.
    I think they impose that limitation for tamdem purpose where you would have two very strong riders torquing the SHub.
    Check that thread : Rolhoff Speedbone tips
    I've been able to bypass the use of the Speedbone with a Hope mono mini.
    "There is a big difference between kneeling down and bending over" -FZ

  4. #4
    mtbr member
    Reputation:
    Join Date
    Mar 2006
    Posts
    66

    Speedbone on a KM

    i run a speedbone on a KM with sliding brake mounts, no issues what so ever.
    'Bicycles themselves are the perfect blend between artistic craftsmanship and technical application' - Carl Schlemowitz

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