I found that having my bike in the classroom always earned me brownie points with the boys, but most of the girls were more interested in what I wore to ride to school (i.e, "you didn't ride in your high heels?"). These were 6th or 7th graders. I think it sets a serious good role model example, since I am almost old enough to be their grandmother!
I am probably going to be doing a long term subbing gig for one of my former colleagues while she is on maternity leave, starting the last week in February. The first thing I thought of is that i will be able to rack up the commuting miles again!