Hi SBW. Welcome to C&V, my hide away from Foo and Roadie forum.

"So youre getting a vintage road bike..."

First off, a vintage Trek is a great bike. The 85 Trek 460 specs state it was built with T-1 chrome-moly (I'll let someone else fill in who made it, but I think it may have been TrueTemper, in any case, good stuff).

You'll have 700c wheels which is good so you've got your pick of tires and even wheel upgrades down the road should you wish it. Many lower end (and even some higher end) road bikes of the age came with 27" wheels which makes finding high performance tires for them now more difficult.

SunTour was near its peak in the mid-80's and the Cyclone derailleurs should function very well for their age. You will have friction downtube shifters. Is not difficult to shift with friction downtubes, but it does take some practice and some skill to do it well.

I would make sure your LBS replaces the brake pads. At 20+ years old now they are most certainly hard and I'm sure as a mtb rider you can appriciate the need for good brakes. The Dia-Compe brakes are going to be what's called single-pivot style. Many people still like this type best, but more designed dual pivot brakes can provide stronger braking.

I'm not sure how many speeds this Trek came equipped with. At the time I believe 6speed is fairly likely. With the current wheels you can equip most 5, 6 or 7speed freewheels. With new wheels, 8, 9 or even 10speed is possible (though will require additional part upgrades).

Are there any particular questions or concerns you might have with the bike that you want/need answered?