I had identical computers on both my bikes until I upgraded on my main bike to one that's fully wireless, with HRM and altimeter--the Blackburn Neuro 6.0. This one's supposed to be able to determine which bike it's on and switch between the wheel sizes I entered and the odometer, stats and stuff automagically.

I ordered the second bike kit in April and it never came in--until yesterday. I'll pick it up next payday and see if the claims are really true.

The Neuro 6.0, BTW, is $180, which explains why I own only one. The second bike kit is just $45 at LBS prices. It'll be nice to have HRM and altimeter on both bikes.