CR 175 is a solid mostly smooth gravel road that climbs for 12 miles one-way from 7,000ft Salida to close to 10,000 feet, way up in the Arkansas Hills. It is along the Great Divide MTB route, but can also be ridden as an out-and-back this would make for a 24 mile ride with a ton of climbing, gorgeous views, and plenty of options to keep riding and/or turn this into a big gravel loop. Some singletrack trails also connect to this road.