What type of bike will you be riding? For the Great Divide Route it's best to have a bike with front suspension and wide tires. Here is something from our online info about the Great Divide Route:
The Great Divide Route is extremely hard on equipment. The weight of your gear exponentially multiplies the stress of riding steep, fast, rough downhills. Wheels, tires, and drivetrains (chains, cassettes, bottom brackets, chainrings) take a lot of abuse and might need replacing along the course of the entire route. Suspension equipment on the bicycle helps to mitigate the abusive nature of the terrain. That said, nylon pivots of some full-suspension bikes wear out extremely fast and are not recommended. Suspension seatposts, good handlebar grips, and front-suspension forks help smooth out the many miles of washboarded and chuckholed roads. Weighting a suspension fork with panniers works well, evens the weighting of the bike, and adds little extra stress to the fork. Trailers also work well and lighten the rear triangle of the bike.