Installing a chainguard on a bike with derauiller My pants always get caught in the chain (and wearing shorts is not an option). However, it seems that it's impossible to have both a derailleur and a chainguard so what is the solution?


Can I just lock the front derailleur in place and slip the chainguard past it. (locking the bike in top gear?)
Do I have to remove the derailleur entirely, by breaking the chain?
Can I just remove the smaller front gears and lock it into third? How difficult is this? Do the gears just pop off or is there more to it?
Does anyone make a metal chainguard so large that it could encapsulate both the derauiller AND the front crankset. (a preferred solution, but not easy to find)




Example of a chainguard to protect the pants from getting ripped. It also proctects the rider in case of a fall so that the gear teeth don't puncture the leg. (It happened to me and is just as nasty as it sounds! Gear teeth are dirty.):



Note: The winning answer will suggest a chainguard that covers both the top of the chain and the crankset (as seen in the picture above). Suggestions of tying, clipping or banding pants are not an answer to the question being asked. However, an answer that involves modifying the bike in some way to accommodate a chainguard will be accepted.
This StackExchange site has its limitations, in that product recommendations are not allowed because of regional differences and products/pricing going obsolete. However I think the answers are no you don't have to break the chain, remove the derailleur or lock off any gears. Products exist but are quite unusual so you will have to do some searching online or in bike shops in your local region.

Using Google, I found a couple of examples. The first one I got to a website which sells chainguards and browsed through the ones which say compatible with a single gear, and discovered some which say compatible with a triple ring like this style:



Another Google search along the lines of "chainguard triple derailleur" and I found this image, which has a more conspicuous allowance for the derailleur to remain fitted and usable: