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Earlier this year, adventurer teamed up with professional mountain biker to attempt something that's only been done once in history: climb and descend Mount Kilimanjaro on mountain bikes. To make things even more interesting, the two decided to keep the mission totally self-supported, meaning they didn't accept help from porters, or from medicine to help with altitude sickness. The goal of the expedition was to raise one dollar for every foot of climbing they did (that's $19,240) for , a charity that builds burly bikes for folks living in remote areas throughout Africa. This exclusive clip is a behind-the-scenes look at the trip, and the gear they used to make it possible. Look for a full documentary on the expedition later this year.