Originally Posted by socalrider

Wheels are the biggest issue with 200+ riders.. 36 holes are a must.. I would also look at cyclocross bikes.. Many of the new bikes come stock with 36 hole wheels, canti brakes give you a little more stopping power and most frames are a little beefier to handle the extra abuse.. Cross bikes usually come with wider rims to accomodate up to 700x40/45 tires, but also run fine on 700x28's..

I personally have a surly crosscheck, all steel frame and love the fact that I can ride roads or trails with it.. It is a very nice and fun ride...