Given that the latest generation of SB5 took four years of carbon tinkering and ritualistic sacrifices to the gods of suspension, we're not surprised that, for 2016, the Yeti SB5 Carbon Mountain Bike Frame returns without any big changes to geometry or the Switch Infinity travel mechanism at its heart. Developing the Switch Infinity went beyond the virtual realm of design software and protractors, with the engineering shamans of Yeti's tribe cannibalizing materials like dropper post shafts from existing equipment in order to produce testable proofs of concept. The end result is a frame whose suspension design gives XC minded speedsters more confidence across terrain and enduroDH bruisers an efficient climbing platform that doesn't compromise on big hits. The Switch Infinity suspension's linear travel hits the sweet spot of anti squat to keep pedaling sharp across rocky climbs and relentless small bumps. Deep in the stroke, the Switch Infinity slider works in conjunction with the upper pivot to produce a vertical wheel path that effortlessly flattens big, square edged impacts. It also erases the momentary harshness that its predecessor, the Switch Link design, would display when pushed to the absolute limit. Of course, most riders will never experience that dead spot on the Switch Link, but the SB5 isn't for most riders. It's for the all mountain racer who demands that his machine eats deep log roll overs with the same tenacity that it cleans long climbs a rare breed in the enduro scene as a whole, but common enough in Yeti's Tribe of enduro nutters. It's also easier to maintain than its predecessor, which makes even some of the most mechanically inept feel like a pro wrench. The SB5's frame remains the next evolution of Yeti's proven carbon fiber chassis. Frame weights are right around five pounds with shock, depending on size, which puts it on the lighter end of the trail bike spectrum, and it does so without sacrificing strength or stiffness. With thought...