Is this your first motorcycle? Or just your first BMW?
Ok this may sound stupid... but when changing your tire out of your bike the TPS sensor... does that need to be changed as well? Is it just a battery? Or a new unit thats installed?
No, it stays attached to the rim. I always try to let the tire changer know it has a TPS sensor right near the valve stem, but most all of them expect it these days and try to avoid that area.
It's a sealed unit, so if it does need to be replaced, you have to buy the whole thing from BMW (around $220 each). It should last at least 5 years or 50,000 miles or more, so most riders will never have to worry about it.
How much does it cost to get your tire changed at the dealer ship? Let's say I just bring in the rims with the tires how much would that be? Was thinking of ordering some dunlops in advance then droping the bike off.
Depends on the dealer, and depends if you've removed the wheels or have them do it. For the wheel only, expect to pay around $50 each. For wheels on the bike, I wouldn't know, as I always just pull the wheels off myself (sometimes in their parking lot).
You might save a few $$ buying online versus dealer tire prices, but most dealers won't install tires that you didn't buy from them, so you have to find an independent shop or just buy your own tire changing equipment...
Lastly, usually the rear go out first. Do you guys just replace the rear first? Or just get both done? Or replace the fronts when its time to install the new rear.
I usually get 2 rears to one front, give or take. I'll sometimes change both just before a long trip so I don't have to worry about it. Since I do much of the work myself, I often have a pile of half-used tires lying around that I can throw on if I just need something for local rides.
Or there's always this option