Ben having a ball racing my 29r SS in cx this year. Not doing too bad either, at times I feel like I'm cheating using my Mtn bike.
I'm running 2.1crossmarks, a little too much beef for cx. The 35mm tires are a bit wimmpy for our muddy conditions.
Anyone make a 40-44mm mud tire? That would be an ideal size for using a Mtn bike.