The Knock Block stops the handlebars and fork from spinning, preventing the fork crown from striking the down tube. The Knock Block system prevents this with a chip in the top tube that interacts with a keyed stem, spacers, and headset top cover. This means the fork crown might hit the down tube if it spins around during a crash. Trek’s Straight Shot down tubes, however, are straight from the head tube to the bottom bracket to increase frame stiffness and strength. Most mountain bike frames have a curve in the down tube where it joins the head tube to prevent interference with the fork crown. RE:aktiv Thru Shaft shocks are currently found on the Fuel EX, Remedy, and Slash. This makes the shock more responsive and reduces friction. The damper no longer needs to compress an IFP to create space for displaced oil. The Thru Shaft design eliminates the need for an IFP by allowing the damper shaft to exit out the bottom of the shock. This displaced oil needs to go somewhere, so it pushes against the IFP, compressing a gas charge behind the IFP. When a shock absorbs a bump, a damper shaft moves through the shock and displaces oil. Most mountain bike shocks are designed around an internal floating piston, or IFP. In 2018, Trek added Thru Shaft to its RE:aktiv shocks. RE:aktiv shocks are designed to reduce the need for lockouts and compression adjustment on full-suspension mountain bikes when pedaling on smooth terrain or climbing. When the shock's shaft speed increases on rough terrain, the valve opens up to quickly absorb impacts before closing again. In RE:aktiv shocks, a spring-loaded valve inside the shock body provides increased low-speed compression for more pedaling support. In 2014, Trek worked with Penske Racing to develop RE:aktiv valve technology for its rear shocks. Here is a list of technology and features that are only found on Trek mountain bikes. Trek has a long history of innovation, and it has introduced several ground-breaking technologies to the sport. In between are several Fuel EX models that offer different frame materials and component builds so riders can pick the bike that fits their needs and budget. A Fuel EX 5 ($2,399) has a more budget-friendly aluminum frame, Shimano Deore drivetrain, entry-level RockShox and X-Fusion suspension, and alloy wheels, stem, and handlebars. Higher numbered bikes cost more but are equipped with better components.įor example, a Fuel EX 9.9 ($9,499) has a top-of-the-line OCLV carbon frame, SRAM XX1 Eagle AXS drivetrain, Fox Factory suspension, and carbon wheels, stem, and handlebars. To differentiate build levels within carbon models, Trek uses a decimal system that ranges from 9.5 to 9.9, with 9.5 indicating entry-level builds and 9.9 indicating top-of-the-line builds. Models with a 5 through 8 use aluminum frames, with 5 indicating entry-level builds and 8 indicating top-of-the-line aluminum builds. Trek Fuel EX 9.9) to indicate the frame material and component build. Trek mountain bike models use a number (e.g. Below is a guide to decoding Trek’s naming and numbering system. The hierarchy within models is described using letters and numbers that can be confusing to uninitiated buyers. Trek has a huge selection of mountain bike models, and within every model, there is a wide range of builds to choose from. Who it’s for: Enduro racers and riders looking for the most downhill capable bike that can still be pedaled uphill. The Slash is used by Trek’s factory Enduro World Series race team and will suit riders looking for a competitive enduro race bike, or a bike that will enhance their confidence on steep and technical downhill trails. Available only with 29” wheels, it smooths out the gnarliest terrain and maximizes downhill speed. It provides the most suspension travel and slackest geometry short of Trek’s Session downhill bike. The Slash is Trek’s 29er enduro race bike. Suspension travel: 170mm front / 160mm rear
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