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  1. #1
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    Is it possible to convert a single speed to a 1x9?

    Has anyone done this or does anyone know if there is room to put a cassette and rear derailleur on the GF Rig?

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    I have heard that it is possible but would need a bit of searching around - possibly some welding. What would be easier is to install a hub gear on the rear wheel. You will have to have the wheel rebuilt but it is all pretty common stuff. I don't completely understand why but people say that you can get by with 5-7 gears in a hub gear instead of the umpteen that people usually have.

    I think it is easier to put a derailler on the crank - there are some bolt on models - so if you have a rear hub gear with 5-7 gears and 2 speeds up front you should be good to go.
    Last edited by pengyou; 05-05-08 at 08:36 AM.

  3. #3
    ed
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    Quote Originally Posted by bank5 View Post
    Has anyone done this or does anyone know if there is room to put a cassette and rear derailleur on the GF Rig?
    I'd go 1 x 14 (rohloff)

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    what is the distance between drop outs? The space needed for a cassette is pretty standard.

  5. #5
    M_S
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    Fromt the pictures I've seen it looks as though you could fit a standard GF derailleur hanger on the Rig. The tensioning is done through the EBB, and the hub spacing is definately 135mm, like almost every mountain bike on the market, singlespeed or otherwise. I would ask on the 29er section of mtbr.com, lots of fisher owners there.

  6. #6
    Senior Member deraltekluge's Avatar
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    Quote Originally Posted by pengyou View Post
    I don't completely understand why but people say that you can get by with 5-7 gears in a hub gear instead of the umpteen that people usually have.
    On a typical mountain bike setup, there is a lot of overlap in the gear ratios. The large and the small chainrings provide only 2 or 3 gears each beyond the range of ratios provided by the middle chainring.

    Here's what Rohloff, which has 14 gears, says about it...



    Five to seven gears wouldn't give you as good a selection of gears, of course, but you could possibly cover the range, with wider spacing between the ratios.

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    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    I run a 1 by 8 on my xc/singletrack bike and love it... I have just enough top end to get me to the trails and all the gearing I need for playing.

    I found I never used the granny and the big ring spent more time being used as a bash guard.

    A Rohloff would be great.

  8. #8
    Senior Member deraltekluge's Avatar
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    Quote Originally Posted by Sixty Fiver View Post
    A Rohloff would be great.
    It would, but check the price list. The prices are in euros, and the conversion is about $1.55 = 1.00 as of today.

  9. #9
    ed
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    Quote Originally Posted by deraltekluge View Post
    It would, but check the price list. The prices are in euros, and the conversion is about $1.55 = 1.00 as of today.
    A "built" Rohloff setup is about $1300 or so. (new)

    Another alternative would be an 8sp Sturmey Archer disc with a small ring up front. The Sturmey's lowest gear is actually 1:1...no underdrive. Therefore, you'd prob. need to run a 22t up front. You'd have gobs of BB clearance though.

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