So South Florida is starting a cyclocross series. The first race is in a month and I have a steel single speed, and a specialized stumpjumper with propedal and a lockout. The Mountain bike will be heavier to carry but has more speed and shock options. The course is in a park, and looks short but technican(?????IMO) and will probably have manmade options and be mostly flat. They do have a separate first timer and single speed division so I'm covered either way. I would have to swap tires and pedals to use the single speed. I am leaning more towards the mountain bike. Any advise and suggestions would be great. It looks like fun! I think I'll give it a shot.