I run a Bontrager Trip 2 wired on my road bike, because the cheap analog wireless computers tend to go haywire next to my Cygolite headlight on any flashing mode. It has settings for 2 different wheel sizes to be used on different bikes, although there's only 1 odometer. Fine if you want to track total overall miles you've ridden, but not so good if you're like me and like to track miles on the bikes themselves.