We're living in a golden era of mountain biking. Never before have you been able to get a bike with all the technical capabilities of the late 2000's World Cup DH race bikes, at sub 30 pound weights. And one of our favorite examples of this progress is the Niner WFO 9 4 Star Complete Mountain Bike. With a stellar SRAM package, from the X01 one by eleven drivetrain, to the EWS winning RockShox suspension package, this is a bike that will gladly handle anything you throw at it. And while it's clearly optimized for going down, it's both light and efficient enough to make climbing a snap, too. When trail bikes are this good, we think you'll agree there's never been a better time to be a mountain biker. The WFO established itself early on as an immensely capable bike when ridden wide freakin' open, and the latest version will crystallize that reputation. For starters, Niner relaxed the head angle to 67 degrees, which puts it on the very slack end of the spectrum for big wheeled bikes. And while this change enhances the high speed stability, it was important to keep the WFO responsive across a wide variety of trails. Accordingly, the chainstays were shortened to a more moderate 17. 4 inches, and the top tube lengths have also been reduced by 20mm across the size range. This gives it a lighter handling feel, and keeps the wheelbase from getting unwieldy. Rounded out with a slightly lower bottom bracket, the new WFO has all the stability of its predecessor, with greater versatility. With a generous 150mm of rear wheel travel, the WFO is clearly optimized for descending fast in hairy terrain. But you may be surprised to find how responsive it is when you get on the gas. That's because of Niner's CVA suspension platform. Unlike other designs, CVA is optimized for the increased bottom bracket drop inherent in 29in wheeled bikes, which helps to maximize efficiency. It tends to ride high in the travel, with a controlled mid stroke, which keeps the WFO stable through rock ...