Replying to How Important are School Sports for College?

So, im in quite the predicament. This summer i started working at a bike shop, which has also caused me to start road racing, along with dh and xc racing. Last year all i did was xc race, so i could do a fall school sport too (cross country.) I like biking a lot more than cross country too, but my family says i have to do a school sport of some sort in order to get into a college. In order to do cross country, i would have to drop road biking and the team which is a blast. So my question is, how important are SCHOOL sports? I obviously do lots outside of school, but will colleges recognize that? And if so, how can i convince my parents they do?