I'd say fixies and freewheels were very close to 50/50 and everyone seemed to respect each others preffered choice of bike setup. But yep the course was really flat and there was no real tight technical corners.... The fact that you had to lock your bike at every checkpoint and also take into account the heavy and bulky items that had to be carried this seriously favoured the fixed and single speed setups.... Having a bike that you could just point and shoot without worrying about the right gear selection and crap like that was definitely handy.