Ann, I am in the same boat as you. I started doing weigh bearing exercises as well for Osteo. I do 10 minutes of stairs 4-5 times a week, I walk a mile a day; if you can run that's even better. I also am lifting weights under the guidance of a trainer with bone building in mind.
I believe that if it wasn't for bicycling, i would never have the strength or stick to it iveness to do any of this stuff, so don't give up cycling, just augment it.