29ER Series: Big wheels equal big speed. Marin?s 29er series has a bike to suit every rider. From the race-bred carbon CXR 29er, to the classic steel Pine Mountain, every Marin 29er is designed to elevate your ride. Combining Marin?s proprietary 29er geometry with the inherent qualities of larger 29? wheels, every bike offers a stable ride that rolls over roots, rails through corners and rips up climbs.