Trail wheels often fall into two categories—they’re either heavy and durable or light and flexy. And because of this a lightweight wide-profile and enduro-ready carbon wheel seems like something only found in a fairytale but lucky for you we made it a reality. The Traverse SL Fattie 27.5 puts all the flick'able nimble features you need in an all-mountain wheel into one package and it has the results to prove it. Along with light overall weight stiffness and durability another top priority for the Traverse SL was ease of use. First off we got rid of the creaky straight-pull spokes and corrosion-prone alloy nipples. Next up we landed on 28 J-bend spokes for both the front and rear wheels that are all the same length—making it easy to find replacements if needed. And finally we engineered a new hub design with a wider profile and higher flange to aid in overall stiffness. What's with the big-boned name you ask? The Traverse SL Fatties may be wide but with a 30mm inner rim width they’re far from the girth of a fat bike rim. But let's talk width. You've probably noticed that mountain bike rim widths have hovered between 19 and 23 millimeters for decades and they've been long overdue for a change. In the search for a better wheel design our engineers began testing 2.3- to 2.5-inch tires on 45-millimeter-wide fat bike rims to see what if any benefits could be found. It only took them a few rides to realize that the wider rims offered a variety of advantages like adding additional tire volume which better supports the tires in hard cornering greatly improves traction because of the ability to run lower pressures and noticeably increases rim stiffness. They did note that there is an occurrence of diminishing returns with increasing width however and after testing everything from 25 to 45mm determined that a 30mm inner width is optimal. After determining the width we began designing the rim using the knowledge that we gained when developing the Control SL. With this we started with our Zero Bead Hook technology that gets rid of the weak spot found in a traditional wheel and combined it with the wider profile to make a carbon rim that effectively dissipates forces. This way you can take abuse from rocks without the worry of cracks or dents. Ok so they’re strong impact-resistant and tire supporting—they must be heavy right? Wrong. Even though “fattie” is in their name they're far from fat. To achieve this weight we hand-build our rims to our own alloy hubs using only the highest quality DT Swiss Competition Race spokes. Inside our hubs you'll find DT Swiss 240 internals with a quick engaging 54t DT Swiss star ratchet system in the rear that allows you to power over rocks and roots without delay. And while machines do a pretty good job of building wheels we choose professionally trained humans because they do so with an artistic touch that makes for minimal flaws. Whether you need a carbon wheelset to get you through an enduro stage or one to shred your local rock garden the Traverse SL Fattie has you covered. Rim Type: Carbon clincher 2Bliss Ready Zero Bead Hook design. Black graphic under clear coat. Rim Material: Carbon fiber Rim Width: 30mm internal Front Spoke Pattern: Two-cross Spoke Count: 28h Front Spoke Type: DT Swiss Competition Race J-bend Nipple Type: DT Swiss Brass Pro Lock hexagonal Front Hub: Alloy body 15mmx110 thru-axle 19 and 31mm OD end cap options included. Roval Engineered J-bend hubshells have a single spoke length for each wheelset. Bearing Type: Sealed cartridge All Roval Wheels are covered by Specialized's Lifetime Warranty which covers the wheels against manufacturing defects and imperfections. All Roval Wheels are also covered under Specialized's **it Happens No Fault Crash Replacement Warranty for 2 years. Learn more about Specialized Warranty here