Tag Info

There are chainguards that work with derailleur bikes. Your belt might be wider than a chain, but it isn't wider than a triple :-) Something like http://www.sjscycles.co.uk/hebie-chainguard-for-triple-ring-systems-with-a-48t-outer-ring-prod19993/ (If you've got a 52t chainring, it might be trickier to find something that will fit.)

The tight roll was popular when I was a teen. It's less fashionable but infinitely more useful now. You just fold over the cuff of your pants and then roll them a time or two. Super easy and nothing to keep track of. https://en.wikipedia.org/wiki/Tight_rolled_pants