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

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

Old 04-05-13, 08:59 PM
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GeraldF
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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.
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Old 04-05-13, 09:39 PM
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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???
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Old 04-06-13, 05:59 AM
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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???

'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.

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Old 04-06-13, 06:16 AM
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I found this on DutchBikeBits.com:


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.
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Old 04-06-13, 08:50 AM
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Looigi
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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.
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Old 04-06-13, 11:15 AM
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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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Old 04-06-13, 10:13 PM
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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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Old 04-06-13, 10:57 PM
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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
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Old 04-07-13, 10:19 AM
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I got SKS Chainboard on my Winter Commuter and it works great.

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Old 04-07-13, 10:38 AM
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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???
Looks like something cribbed from a table saw.
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Old 04-07-13, 05:13 PM
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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.
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Old 04-09-13, 06:21 AM
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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

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Old 04-11-13, 04:35 PM
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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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Old 05-09-13, 05:45 PM
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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.
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