Surly Cross Check, A cyclocross bike by category, the Cross-Check has proven itself over and over in the real world, on the streets, in the dirt, through muck and sleet, blazing sun and dark of night, over exhilarating trails, through hectic traffic and long stretches of uninterrupted back road boredom. Think of the Cross-Check like an army jeep: tough as nails and used for everything. It's been changed very little over the years because it works great as it is.