Answering your cycling questions

Yes, there should be 2 in the pack and various bands for attaching to bikes.

The box contains two separate quarter turn mounts

Yes.

Hi, the cadence has nothing to do with your gears whatsoever. It works by counting and timing the crank revolutions. It will work with your bike no problem.

The cadence sensor is strapped to crank/pedal arm so will work on any cassette type

The cadence sensor will work with any casette. It attaches to the stay and picks up its signal from a magnet on the crank (for cadence) and the wheel (for speed).

The supplied chest strap should be adequate, it is ANT+, and therefore not compatible with Polar chest straps.

Unfortunately the Polar and Garmin straps are incompatible

Yes, the speed/cadence sensor has a spoke magnet which records speed and distance on the turbo. HR works as normal and it does report calories burned, but its debatable how accurate this is, either on the turbo or on the road - and its difficult to compare a turbo ride with a road ride. Garmin connect does record all your data, except mapping a route obviously.

You'll be able to record HR, cadence and speed from the wheel magnet. I wouldn't put much faith in the calories.

I don't feel that Garmin Connect will be the best place to track progress, as it doesn't really offer any in depth analysis of your ride data.

You would need to download it from the garmin website. Unfortunately, we can't change the contents upon purchase via the store.

Unfortunately you will need to purchase different maps separately.

There is definately a lap function. You can do this manually pressing the the lap/reset button or automatically by setting laps for a specific distance say every 5 miles.

There is a LAP/RESET button as on the 705 to capture your time at a particular point. You can also set the automatic lap function for time or distance as you could on the 705 which records your time distance for every mile / km.

Everything you asked about is included in the box making it ready to connect to the bike and use.

Yes it does, I have bought it myself and its all there

The box contains everything that you will need including power adaptor and USB connector.
Also included are all ties for the cadence and speed sensors and items required to mount the GPS on the bike.

The box does include a USB connector and an AC power adaptor.

The mico-SD card is slotted into the top of the SD card. Remove this mico-SD card, insert it into the Edge 800 and the map will be recognised. It should require no downloading or installation.

There is a smaller SD card inserted into the larger casing. You need to find the small lip on the edge and pull out. You will now have a card that will fit your Edge 800. To view better maps within Base Camp you need to have the card inserted into the unit and then connected to your computer with the supplied USB cable.

yes you get 2 bike mounts

Yes, the Garmin comes with two mounting kits and o-rings, sufficient to mount on two individual bikes at the same time.