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I've been slowly going through the process of converting my old hardtail mountain bike into a commuting bike. One of the things that I'd like to do is to fit a chain guard so that I can ride the bike while wearing long trousers and not have to worry about chewing up the trouser cuffs.

A complication is that the bike (like most mountain bikes) is fitted with both front and rear derailleur gears. I'm not keen to replace these with an internally geared hub system as I have been trying to keep the changes relatively modest in their cost.

Are there chain guards that you can add to bikes with derailleur gears?

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Another option is to have just one chainring on the front, and a wide-range 10-speed rear. Lots of closely-spaced gears is less important if you're not racing. –  Jay Bazuzi Oct 21 '10 at 18:24
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4 Answers 4

up vote 9 down vote accepted

SKS Germany - a company that make great bike products, including the fenders that I put on two of my bikes, make a product called the Chainboard - a chain guard designed to accommodate front derailleurs.

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I don't have one, but you can google SKS Chainboard and find several reviews.

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Even the biggest one only works up to 48 teeth. Which may fit many commuter bikes but wouldn't fit the touring bike I use for commuting. –  Kibbee Nov 12 '12 at 21:03
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In general it can be done. My Unibike Voyager has both a chain guard and a front derailleur.

I see two possible difficulties: You might have trouble finding a chain guard that fits your particular geometry (size of sprockets, model of the derailleur etc.) and you might have even more trouble attaching the chain guard to your frame, as it might need custom attachment points (for example my chain guard is screwed to the bottom of the bottom bracket).

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Pant-leg clips work the best, and are dirt-cheap: http://www.amazon.com/Pant-Cuff-Clips-Bike-Bicycle/dp/B000MM5MSQ/ref=pd_bxgy_sg_text_b

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I have them, and I don't like them, which is why I'm keen to look at chain guards. But thanks for the answer –  deemar Oct 21 '10 at 3:17
    
You still risk getting oil etc on your work cloths, hence I like hub gears. –  Ian Oct 21 '10 at 12:14
    
I use pant-leg clips sometimes, but honestly I find that rolling up my pant leg or tucking my pant leg into my sock works better. –  freiheit Oct 21 '10 at 22:50
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I only tuck my pants in my socks when I'm trying to pick up women. (My wife says that works.) –  Jay Bazuzi Oct 22 '10 at 2:54
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I bring work clothes in a rear pannier bag and change into work clothes at work. I have no idea why anybody would want to cycle in their work clothes. –  Kibbee Nov 12 '12 at 20:52
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Great idea to add chain guard to 21 speed bike. Easy, if you are handy with cutting and grinding. Just remove the 'back side' of the chain guard that is closest to the frame. Your pants will thank you, and your friends will say, OH, no more funny looking pant leg clamps!

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