Garmin edge 305 and my problem was the amount of data you can have displayed at one time. All those screens with minute no's for my tired eyes. So I set it on the 2nd bike to show current speed and HR. Thats all I really want to see on a ride. The rest is still being recorded though.

Get home and I can download the data from the Garmin and then see how badly I have done up the Minimal slopes that wore me out.

Took me many years to buy one one but it is either one Garmin for all my bikes or a separate computer with wheel size etc set up for each bike.