Different bikes handle rough conditions differently. If you're on a bike with a fairly aggressive body position, skinny tires, and racing oriented geometry, it will handle road debris fairly badly. If you're on a bike with a moderate or relaxed body position, touring or commuter slicks and touring style geometry, the bike will handle road debris better. Most mountain bikes will handle road debris pretty well, but if it's a bad frame fit or you're not used to the way they handle, they can be really bad. Practice counts for a lot.
For *most* falls, you and the bike will move in pretty much the same direction. It's well worth practicing falling at least a little, if you've got someone who can spot for you. It's also worth doing things like practicing riding S curves, and learning to "jump" obstacles. Every little bit of "trick" riding gives you more tools for when things go south.




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