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  1. #1
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    Chain guard for a 21-speed: Is it possible?

    I'd like to outfit a 21-speed mountain bike with some sort of chain guard that will achieve the goal of keeping pants away from the chain.

    Does such a product exist? If not, has anyone jury rigged such a contraption? Thanks.

  2. #2
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    Looks like I may have found the answer to my own question. Why on earth don't all 21-speeds come with a chain guard like this??? Screen Shot 2013-04-05 at 11.37.04 PM.jpg

  3. #3
    Senior Member wahoonc's Avatar
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    Quote Originally Posted by GeraldF View Post
    Looks like I may have found the answer to my own question. Why on earth don't all 21-speeds come with a chain guard like this??? Screen Shot 2013-04-05 at 11.37.04 PM.jpg

    'cause it costs money? Dutch Bike Bits sells a couple of different ones. I have a German Staiger that came with one, however the plastic on it was broken, unable to source replacement, eventually I may build a replacement out of aluminum.

    Aaron
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    I found this on DutchBikeBits.com:
    Screen Shot 2013-04-06 at 8.04.51 AM.jpg

    The reviewer says the chainguard fits some bikes, but not others. My 21-speed mountain bike, a GT Aggressor 3.0, has 48 teeth on the outer front ring, which should be compatible, but
    the outter bottom bracket can only be a maximum 40 mm to be compatible. I have no idea how big my bottom bracket is. This info doesn't appear to be provided in the specs of the bike. Does anyone know how I can measure my bottom bracket? Thanks.

    Alternatively, I found the SKS Chainboard Bicycle Chainguard on amazon. A lot of reviewers love it, but say it was a b**** to install. Most people had to trim it down to size, in multiple places, to get it to fit.

    Here's the SKS:
    http://amzn.to/14M1O3t

    I really appreciate any advice. I'm determined to add a chainguard to my mountain bike.

  5. #5
    Senior Member Looigi's Avatar
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    Classic alternatives include rolling up the right pant leg or using a strap or rubber band to restrain the cuff of the right pant leg.

  6. #6
    Senior Member Retro Grouch's Avatar
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    There's lots of different bike frame/drive train combinations. Don't expect any after market product to bolt up easily and not cause some new, unforeseen problem. Once in awhile it might happen, but not very darn often.

    Shop installation of products like that is probably the bargain of the year. Taking an hour or two wouldn't surprise me at all. At typical shop labor costs that would be $60.00 to $120.00.

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    Quote Originally Posted by Looigi View Post
    Classic alternatives include rolling up the right pant leg or using a strap or rubber band to restrain the cuff of the right pant leg.
    I was going to say this, too. I have a multiple-geared bike with a guard I adapted from a junked cruiser, but a strap on the ankle is a lot easier.

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    Yeah, I did a DIY guard when building up a bike for my sister.

    guard only covers the upper chain run -does not encircle the chainrings and front derailer
    a plastic ring guard integrated with the crankset covers that area instead
    this greatly simplifies the project

    Took the steel guard from a cruiser, cut length to fit

    drilled and bolted on supports; good solid support is a must, because millimeters matter when making the guard clear both the crank arm and triple rings:
    2 p-clamps on chain/seat stays up against rear dropout
    1 p-clamp at chainstay about 2-3" back from the rings
    1 diy support arm and clamp bridging seattube to top of guard
    -essentially 3 support points at the 3 corners of the guard

    a bottom pull, top swing derailer was used to fit underneath the guard/supports with no cage/cabling interference

  9. #9
    Senior Member DVC45's Avatar
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    I got SKS Chainboard on my Winter Commuter and it works great.


  10. #10
    Starting over CraigB's Avatar
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    Quote Originally Posted by GeraldF View Post
    Looks like I may have found the answer to my own question. Why on earth don't all 21-speeds come with a chain guard like this??? Screen Shot 2013-04-05 at 11.37.04 PM.jpg
    Looks like something cribbed from a table saw.
    Craig in Indy

  11. #11
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    A lot of Koga Miyata models, esp the everyday bikes, come with 3x8 and chainguards. They are almost impossible to find in bike shops. You could probably make one out of fibreglass. Aluminium may also work.

  12. #12
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    If you don't need/want the full chain guard, a bash guard might work.

    http://www.nashbar.com/bikes/Product...63&cagpspn=pla

    P2
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  13. #13
    Elmira>Taiwan>Elmira flatlander_48's Avatar
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    Quote Originally Posted by Looigi View Post
    Classic alternatives include rolling up the right pant leg or using a strap or rubber band to restrain the cuff of the right pant leg.
    Or a semi-circular metal or plastic clip
    Or an elastic and Velcro loop
    Or a piece of surgical tubing from a dope fiend neighbor
    Or a couple of condoms tied together
    Or ...
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  14. #14
    xtrajack xtrajack's Avatar
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    I just installed a chainboard on my ride. I got lucky it was even easier to install on my bike than it was installing one on my wife's bike.
    2008 Kona Fire Mountain/Xtracycle
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