It was a bit of a killer, but bear in mind that we started at around 11,500 feet so it was only about a 3,000 feet of climbing (but with no air!). Also, the last 1/2 mile is rock scrambling not suitable for bikes so we ditched the bikes by the side of the trail and walked the last bit. The nice part about taking the bikes was being able to coast on the way back down. There's no coasting when you're walking! Also note that this was a warm up for Whitney. We climbed Whitney (a mere 250 feet higher) three days later but left the bikes at camp for obvious reasons. .