Did you do it yet? If so, how was it? If not...don't let the ankle tweak get you down. I sprained mine badly 6 weeks ago (while trail running) and after a week of doing pretty much nothing I found that biking didn't bother it much at all (hitting bumps kinda made the tendon painfully vibrate, if that makes any sense), but other than that the pedaling motion didn't hurt. It actually felt good to get blood flow and movement to the injured area. I credit biking with my good healing (especially since I did everything wrong in that first 24 hours after the initial sprain and could have really delayed the healing).