What do I do about tires?

You want tires to match your riding conditions. The 29-1 is good for hard pack, as is the Race King.

The Prowler has a much more open tread pattern, so it will be slower, but better in the loose stuff.

Run the two tires however you like. It is not like you are going to be locked into a single configuration. Ride it with the Race King on the rear and see how you like it, then swap them and see if you like that set up better.

You don't have to be picky. Going 2.35 is might have clearance issues.

2.0--2.2 almost the same. Now a 1.5 with a 2.2, might be too much variance.

I always put the "nicer" tire in front, because of braking and grip on steering. The rear, you need for climbing on loose stuff, but it is along for the ride on downhill. The most it does is allow you to brake steer when descending.

So as long as the tires are not 2 different types (slick, semislick or pure knobbies) and somewhat the same width it shoudl be fine.

Tire sizes can vary somewhat from model to model so even if the nominal size might be smaller it could be the same in reality. In any case a .1" size difference is very small. It won't change the diameter enough to even notice unless your original tire is larger than its nominal size indicates and the new tire is smaller than its nominal size

tires are tires

wle