I have a stupid newbie question...what the heck is crosschaining and why is it bad? And I can never tell what gear I'm in on the road bike...no numbers to tell me, so I have to go by feel which I'm not really good at yet either. My mountain bike has numbers on the shifter, so I always know what gear I'm in. And thanks to whoever said right was rear.....now I know. I swear, I have never felt so inept as when I first got on my road bike....And that was only on SATURDAY!!