Oh, it's almost totally flat. Just a bit on Antelope Island and another bit toward the end when it goes up into the low foothills of Kaysville and Centerville. It's kind of funny how flat the SL and Utah Lake centuries are, considering all the surrounding mountains. Come to think of it, there's very little climbing in the MS150 in Logan, too. I guess the Snowbird hill climb (which I've never tried), Park City 100, and other events balance that out.
I definitely rode the road bike. I rode the MS150 years ago with a guy who put slicks on a carbon mtn bike. The bike was light enough, but the gearing was low and he was dieing from lack of hand positions. I don't think many people on mtn bikes go the full 100. It's pretty much an out-and-back, so you can go 28, 68, 80 (skip the island and/or the loop north into Hooper), or 106.
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