In this 9th year of The Bible of Bike Tests, we freshened up what has become the most informed, objective and trusted collection of reviews in mountain biking. Bikes are split into three sections dictated by wheel size--27.5, 29 and Plus--in order to avoid confusion around what constitutes 'trail,' 'all-mountain' or 'enduro' categorization. What you'll find here is an assembly of really good bikes. Period. New this year, we added "Versus," or head-to-head comparisons of in-demand bikes, in order to better aid your buying decision once you've settled on wheel size and travel. Our crew of nine testers rode this year's batch of best-in-class bikes in Michigan's Upper Peninsula, where our Marquette base continually impressed with its beautifully built trails, welcoming community and flawless fall weather. For two full weeks, we logged test laps at the Noquemanon South Trails, a network whose mix of techy climbs, chunky rock gardens, swooping berms, jumps and fast, smooth singletrack served up the requisite variety and distance to assess the merits of multiple bikes per day.