"My activity screen does not look like Steve B's with the break out for road and mountain bike, but that may be a difference between the 830 and 1030 devices."
Interesting. I only recently learned that the 1030 was able to send this Default Ride Type data as set in the 1030 to Connect, I learned it from a guy with an 830 on the Edge Face Book page who does it on an 830. No picture of what his screen looks like though.
Problem may be that while Connect lets you see the Default Ride Type data as recorded per ride on the device, it doesn't mean they let you do anything useful with this, like tell Connect that this ride was on a particular bike. Garmin has issues with understanding what features would be useful to people and incorporating to future OS updates. They suck at this actually.