Well, I had a tibia fracture a few years ago (also from collision), although it involved surgery, and my knee also. I started PT immediately because of the knee involvement. I was riding a stationary bike in PT probably from about 8 weeks, and by 10 or 12 weeks I was going out for bike rides, even though I was non-weight-bearing for 14 weeks also. I just figured I wouldn't unclip that leg unless the bike broke down, and then I would call for a ride. I told my PT I was doing it, and she didn't really object. Just made fun of me a little.

Biking was not actually a problem for me at all. Walking was painful the first few days.

In general, at 14 weeks, my doc said the bone was completely healed so I could do anything I wanted.