Day 4, as mapped here, demands 27.3 miles of riding with 3,200 feet of climbing—definitely the most difficult of the four days in this itinerary. However, you do have two options to make Day 4 easier. As mentioned in the Day 3 itinerary, if you camp at Hardscrabble instead of Potato Bottom, you'll move the first climb from Day 4 to the end of Day 3 instead. That would turn Day 4 into a 23-mile pedal with 2,600 feet of climbing.

Alternatively, if you've opted for a guided ride on the White Rim, Day 4 is also dramatically easier. Instead of pedaling all the way to the trailhead at the end of Mineral Bottom Road, the van (at least, if you book with Western Spirit ) will pick you up at the top of the steep switchbacked climb on Mineral Bottom Road, shortening the day to just 14 miles of pedaling and 1,800 feet of climbing—dramatically easier!

Onto the riding.

After a brief stretch of pedaling through some deep sand, you'll reach the first—and steepest—climb of the day, crossing Hardscrabble Hill. Along with the climb to Murphy Hogback, this is one of the steepest climbs of the route and may force some riders to hike brief sections. Thankfully, the views are spectacular as you wind up through a canyon and enjoy expansive vistas of the Green River below.

After cresting the top of Hardscrabble, the descent is fast and flowy, with more scenic river views unfurling below you.

The next stretch of pedaling is fairly straightforward, but there are some deep sand pockets in spots. After a few miles of pedaling, you'll leave the boundary of Canyonlands National Park, and all too soon, you'll reach the bottom of the Mineral Bottom switchbacks.

The climb out of Mineral Bottom is the longest of the trip as you work to regain all the elevation that you lost on Day 1. Thankfully, this section of the route is a well-graded two-wheel-drive road, which makes for very reasonable riding. But that doesn't make it easy—it's time to do work as you grind up an endless series of switchbacks with vehicle traffic running in both directions. Thankfully, the views from the elevated road shelf are downright beautiful!

At the top of the switchbacks, you'll reach a pit toilet, where the Western Spirit van will pick you up if you're on a guided trip, marking the end of your four-day excursion. Why does it have to be over so soon?!

If you've opted for a self-serviced model, you're still far from done. You still have another 13.3 miles of pedaling and 1,400 feet of climbing to tackle on Mineral Bottom Road. Lucky you?

While the nature of the White Rim road inherently includes many different route possibilities, including shortening the first and last days, camping at different locations, reversing the direction, and many optional side quests, one thing is certain: this is a mountain bike experience unlike any other!