http://www.tworoadsfitness.com/larbreaswom.html has a great selection of bras for larger-busted women. I'm a big fan of the Moving Comfort Maia bra. And, if you need something for no bounce whatsoever (although it can be a bit tough to breathe in, then the Enell sports bra (Oprah's favorite) is a good choice. But for biking I'd recomend the Moving Comfort.