Is there a way to separately track miles on two bikes located in Connect "Gear"?

Bill,  I have three profiles set up on my 830 (and 810 before that) for Road, MTB, and Indoor and I select the required profile via the left/right arrows when I commence a ride.  Each profile is configured with different sensors and different data screens, and when the ride is uploaded to Garmin Connect the activity shows either the Road bike, the MTB, or as a trainer session.  Connect also totalises the mileage for each bike (Road & MTB) under Gear.  I haven't found a way for the 830 to automatically select the profile depending on which sensors it detects, so I have on occasion inadvertently ridden the MTB using the road profile or visa versa, however I can change the bike type in Connect after the activity is uploaded.  This all worked flawlessly with the 810 but I've not used the MTB since having the 830, perhaps this functionality is now missing?

Right.  Sensors are not associated with activity profiles, and there are no bikes on the device.  The Edge will use any active paired sensors it detects irrespective of activity profile selected.  If there are more than one of a type detected,  go into the sensor menu and check that the one you want is being used, and change to the one you want if it isn't.

Actually been looking to do this today aswell but unfortunately it doesnt seem possible. At the minute I have road as default in gear, but after a ride I manually edit gear in GC if I was on MTB and select the correct bike . Not that I am a developer or anything but it cant be that hard for them to implement . 

I just want to link a item(s) from GC- gear to a EDGE- activity profile  . So the MTB will be the default item for when I start the MTB activity profile on the edge, and road bike along with shoes will default for when I start the road activity 

Pete04g. Exactly. Like you I edited today's ride in GC to show the correct bike. I think it would be awesome for garmin to update the software so a user can associate a bike to a particular ride profile.

Separately, I too would like to see much better gps signal reception.

Thank you all for helping.

Garmin Connect allows you to have multiple bikes set up to track mileage in each one, but it will set only one bike as the default for all "Cycling" activities (regardless if it is road, mountain, cyclocross, etc.).  So whichever profile you use on the 830 will not carry the bike over into Connect when you upload the activity.  So if your default bike in Connect is not the same bike you rode, you need to remember to change it in Connect for that activity.  Otherwise, the miles are incorrectly added to your default bike.

I had this question, and posted it here in the Connect forum:

https://forums.garmin.com/apps-software/mobile-apps-web/f/garmin-connect-web/168423/setting-default-gear-for-an-activity

Thank you.

my old Edge 800 you could press power button once and and simply choose sensors/bike/screen brightness or lock screen= so easy why not have that on newer models???

It would indeed be cool if this is done automagically, that is, associate bike miles to the appropriate bike associated with the profile when the ride is uploaded to GC.

So this should be easily implemented on the backend. The new Sram AXS web app can auto detect bikes based on the sensor pool. And all that the sram app does is pull the workout from Garmin Connect. I have two bikes both with power meters and obviously I don't swap the crank based powermeters between the bikes. This should be an easy fix.