Part trail-shredder, part bikepacking rig, the Surly Karate Monkey 27.5+ is painted in unsubtle yellow and comes with a whole lot of spunk. It’s a â€plus’ bike, meaning it’s got bigger rubber than a normal mountain bike, but can’t truly be called a â€fat’ bike. The result is a balance between the nimbleness of a regular mountain bike and the â€float’ of a fat bike.