Very good questions......I am not where the fork is unfortunately so steerer length I can post by Monday, but I might have to take them down the LBS to check whether they're 1 1/8" or 1".
I have run them on a Rockhopper in a 1 1/8 head tube, but did have an issue where I had to put a few laps of cut up coke can between the steerer tube and the crown race to make it sit tight. But the steerer is the same width all the way down, i.e. doesn't have a protruding bump on the end for the crown race to sit on. Might have been that which was the issue and it still be a 1 1/8 steerer, but I'll take it to the LBS to measure/make sure....