The first time I rode my new Lenz Sport Revelation 650b bike, I felt right at home. It is light and responsive, and climbs incredibly well. I never feel bouncy on climbs, and I can handle technical ascents better than ever. It has also given me a new found level of confidence on downhills. I love this bike, and I would recommend it for anyone looking for a fast cross country bike with 27.5″ wheels.