Mountain

Cassidy is the natural evolution of our Split Pivot lineup. The aluminum frame is engineered for hard-charging on huge terrain, and its progressive geometry with 165mm of rear travel and a 180mm RockShox ZEB fork takes the edge off of burly rock gardens, daunting drops, and steep and sketchy trails. The Split Pivot suspension system adds pedaling efficiency and offers smooth, consistent braking throughout the travel for maximum traction. Shimano's SLX components round out the package for precise shifting, while four-piston brakes bail you out of any situation. Cassidy SLX is made for pulling off smooth moves when the terrain is anything but.

Breaking the Mold with a 29er Bike As the first "plus" bike to hit the market, Krampus changed the way many people approach trail riding. It's shown people the light of how high volume, large diameter tires can vastly improve the ride experience. It's also done a bang-up job dispelling the myth that big tires make you slow. Krampus is kind of like the opposite of a mullet: long in the front and short in the rear. With a long toptube and compact chainstays, it takes trail-shredding abilities to the next level. A mullet may be business in the front, party in the back but Krampus makes partying its business. "Lean back, hang on, and ride that wild horse." -Thor - Modern trail standards: dropper post compatibility, 44mm headtube, Gnot-Boost rear spacing, thru-axles, suspension corrected fork - Compatibility with most mountain bike standards makes it the perfect parts bin bike (no rim brakes allowed though) - Clearance for 29" x 3" tires

Rangefinder is Salsa's confidence-building trail hardtail. Built for riders who want to start discovering their local trail systems, Rangefinder offers geometry and spec designed for the perfect introduction to mountain biking. Rangefinder opens up singletrack and doubletrack adventures and offers provisions for bikepacking setups so riders can expand their off-road repertoires. Rangefinder is mountain biking for the masses. - 6061-T6 alloy frame - Internally-routed shift, brake and dropper post housing - 139 mm suspension fork and dropper post - 1x drivetrain keeps shifting simple with plenty of gear range - Hydraulic brakes offer confident stopping power - Compatible with 29" or 27.5 plus wheels and tires - Carry what you need with the integrated top tube bag mount, two bottle cage mounts in the frame on M, L, and XL sizes, one accessory mount under the down tube, and rear rack mounts

The Cassidy Alloy Frame gives you the confidence to seek out the steepest, most technical trails out there. Its stiff and durable aluminum frame stands up to trail punishment, whether you're enjoying a full day of shuttle runs, barreling through rugged rock gardens, or hitting drops and gaps. 165 mm of Split Pivot rear suspension offers progressive travel for the stoutest trails, with superior pedaling efficiency and consistent braking traction to boot. Build it up and go big.

The Mukluk is Salsa's most versatile fat bike, designed and engineered to excel in a wide variety of conditions. The frame utilizes 197mm rear spacing to accommodate up to 5" tires, and the 100mm threaded bottom bracket allows a wide range of crank (Q-factor) choices. Alternator 1.0 dropouts allow for short chainstays and easily support single speed or geared drivetrain options. The Mukluk can do it all.

Level Up A mountain bike built to raise your game and ignite a passion for the trail. Designed for the mountains and ready for anything Where it thrives: Low-impact trails, gravel roads, leisurely ride What it's built for: handling & durability Highlights - Light and durable SmartForm C3 Alloy frame - SR Suntour XCM suspension fork, 100mm travel. - Shimano 8-speed shifting with double chainring crank / Shimano hydraulic disc brakes SmartForm C3 Alloy Simple yet sophisticated aluminum construction yields a light, lively frame that outperforms anything in its class SAVE Micro-suspension Delivers a smoother, more controlled ride thanks to strategically engineered flex zones built into the frame's rear triangle Slack and Stable A slack 68-degree head angle creates exceptionally stable handling so that you can charge the descents with confidence Right-Sized Wheels The smaller sizes of Trail roll on 27.5" wheels, while the larger sizes come with 29" wheels to deliver the best blend of fit, fast, and fun for every rider StraightShot Internal Cable Routing For an integrated look and easy maintenance, the shift and dropper post cables route cleanly through the StraightShot window in the down tube, while the rear brake line is secured outside the frame

Designed to go where no normal fat bike can, the Surly Moonlander is for riders who want otherworldly capabilities on rocky shorelines, sand, snow, and desolate landscapes not yet discovered. While our proprietary 24 x 6.25” tires surpass the limitations of current fat bikes, the Moonlander still rides like a normal bike, making it easier (and more fun) to navigate previously unrideable terrain. It’s the ultimate choice for explorers who itch for the next great adventure, and aren’t afraid of what they might find. - Constructed from 100% Surly Chromoly Steel for excellent durability - Surly's first bike with a 9-speed Pinion gearbox, an innovative approach to spur gearing that improves reliability and go-anywhere performance with less maintenance - Large volume Surly Molenda Tires on 24 x 100mm Surly Clown Royal Rims creates footprint large enough to float over unpredictable terrain - Clearance for 24 x 6.25” tires, as well as 26 x 5.1”, 27.5 x 4.8”, and 29 x 3” - Comes with rack and fender mounts, as well as accessory mounts on both fork blades to enhance cargo capacity - Weight distribution across front and rear, with a longer back, allows for greater stability - Features TEKTRO HD-M285 Hydraulic Disc Brake System - Four frame sizes to fit most riders: SM, MD, LG, XL - Includes a dropper for easier on and off, especially on soft surfaces"

Timberjack is Salsa's aggressive trail hardtail. Its progressive trail geometry is stable on descents and technical sections, while the Alternator 2.0 dropouts allow for adjustable chainstay length to dial in ride characteristics. Ample accessory mounts and dual wheel size compatibility add more versatility to the package, making Timberjack a well-rounded ripper that likes to party. - 6061-T6 alloy frame - Aggressive trail geometry - 130 mm fork and dropper post provide capability in technical terrain - Alternator 2.0 dropouts expand drivetrain and setup options - Short chainstays and long front-center provide agility and stability on the trail - Front triangle space is maximized for frame bag use - Internal cable routing - Compatible with 27.5+ or 29" wheels

Rangefinder is Salsa's confidence-building trail hardtail. Built for riders who want to start discovering their local trail systems, Rangefinder offers geometry and spec designed for the perfect introduction to mountain biking. Rangefinder opens up singletrack and doubletrack adventures and offers provisions for bikepacking setups so riders can expand their off-road repertoires. Rangefinder is mountain biking for the masses. - 6061-T6 alloy frame - Internally-routed shift, brake, and dropper post housing - 154 mm suspension fork and dropper post - 1x drivetrain keeps shifting simple with plenty of gear range - Hydraulic brakes offer confident stopping power - Compatible with 29" or 27.5 plus wheels and tires - Carry what you need with the integrated top tube bag mount, two bottle cage mounts in the frame on M, L, and XL sizes, one accessory mount under the down tube, and rear rack mounts

Level Up A mountain bike built to raise your game and ignite a passion for the trail. Designed for the mountains and ready for anything. Where it thrives: Low-impact trails, gravel roads, leisurely ride What it's built for: handling & durability Highlights - Light and durable SmartForm C3 Alloy frame - SR Suntour M3030 suspension fork, 75mm travel. - 7-speed drivetrain with double chainring cranks/ Tektro mechanical disc brakes SmartForm C3 Alloy Simple yet sophisticated aluminum construction yields a light, lively frame that outperforms anything in its class SAVE Micro-suspension Delivers a smoother, more controlled ride thanks to strategically engineered flex zones built into the frame's rear triangle Slack and Stable A slack 68-degree head angle creates exceptionally stable handling so that you can charge the descents with confidence Right-Sized Wheels The smaller sizes of Trail roll on 27.5" wheels, while the larger sizes come with 29" wheels to deliver the best blend of fit, fast, and fun for every rider StraightShot Internal Cable Routing For an integrated look and easy maintenance, the shift and dropper post cables route cleanly through the StraightShot window in the down tube, while the rear brake line is secured outside the frame

Horsethief is one bike for many trails. From finessing local loops to savoring new destinations, Horsethief has your back. It's capable of pushing through technical terrain, instills confidence while riding aggressively, and pairs well with beautiful vistas and a post-ride beverage. - Wheel Size: 29", 27.5+ - Front Axle: 15mm Thru x 110mm - Brake Type: Disc - Fork Type: Suspension - Frame Material: Aluminum - TT (Effective): 636 - Rear Axle: 12mm Thru x 157mm - Frame Type: Suspension - Aluminum frame and Split Pivot suspension design with 120mm of efficient travel, remaining fully active under braking while supportive throughout its travel, paired with a 140mm suspension fork - A short stem paired with a long top tube, combined with a 67-degree head tube angle provides descending confidence, yet balances overall wheelbase length and slow speed maneuverability - Every size fits two full-size bottles in the triangle; Anything Bracket and top tube mounts boost cargo space for pack-free riding bliss - Super Boost 157 x 12mm rear hub spacing combined with a standard width bottom bracket results in a 432mm chainstay length that's 5mm shorter than previous-generations - Rear flip chip adjusts head tube angle and bottom bracket height for terrain, wheel size, and personal preference - Spec'd with a 29 x 2.5'' front and 2.4" rear wheel/tire combination, but can accommodate a range of additional sizes of 27.5 x 2.8 - 3.0" and 29 x 2.2 - 2.6''

The Karate Monkey Front Suspension bike features a Rock Shox 35 Gold RL A2 suspension fork with 140mm travel, and it’s paired with a dropper post out the box. Progressive trail geometry and Surly’s Gnot-Boost rear dropout system deliver a versatile bike with the ability to swap hubs and wheel sizes. If you want to round-house kick some trail right in the face, the Karate Monkey is your sled. - 100% Surly Chromoly steel frame, double-butted main triangle and 44mm headtube - The tubeset uses Surly custom trumpet tubes for greater stiffness and durability - Adjustable rear dropouts with 145mm Gnot-Boost spacing. Works with 142 and 148 x 12mm thru, as well as 135mm w/ 10/12 washer - RockShox 35 Gold RL A2 suspension fork with 140mm travel - TranzX YSP15 dropper post with stealth routing; 100mm travel on XS, 120mm travel on SM–XL

As a highly versatile touring bike, the Bridge Club hits the sweet spot that separates on- and off-road excursions. The simplistic design makes it fully adept to handle a full rack and pannier setup, frame bags, or any combination of the two. It doesn’t feel sluggish on paved shortcuts, but can also hold its own on dirt detours. If you’re feeling a little zesty on your next road tour, you won’t be ill-prepared for reroutes through the woods. The Bridge Club is designed to handle it all. - 100% Surly Chromoly frame, main triangle is double-butted; 1-1/8" threadless Chromoly fork - Rack, fender, and four sets of three-pack mounts - Disc brake-specific, single-position vertical rear dropout makes it less intimidating than other bikes in the category - Clearance for 700 x 47mm (with or without fenders) or 27.5 x 2.8" tires (27.5 x 2.6" with fenders)

Given the choice between clearing challenging lines and taking them on with gusto, you prefer the latter. If this sounds like you, the Rustler Carbon frame is the perfect platform for your ultimate trail bike build. The Split Pivot rear suspension system with a Fox Float DPS Performance shock, flip chip geometry adjustment, and 27.5 x 2.3–2.8-inch tire clearance let you build the bike that suits your playful style. Get excited for a trail-roosting rig with impeccable pedaling efficiency—a surefire recipe for fun on many trails.

Hold on Tight - Thrill ride. With the most advanced XC suspension and geometry, and rowdy-ready spec, the new Scalpel redefines cross-country speed – again. Highlights - Ultralight Series 0 Carbon frame with FlexPivot, 120mm travel, and Proportional Response-Tuned Suspension and Geometry - Lefty Ocho Carbon – the smoothest, most advanced, most precise-handling XC fork in the world. Carbon upper, 120mm travel, with a TwistLoc Ultimate remote lockout. - Lab71 painted SystemBar XC-One integrated carbon handlebar and stem - RockShox SIDLuxe Ultimate rear shock with TwistLoc Ultimate remote lockout. - SRAM’s range-topping XX SL AXS Transmission electronic wireless 12-speed group with Level Ultimate Stealth brakes - DT Swiss’s lightest, fastest MTB wheelset, the XCR 1200 Spline carbon

Rangefinder is Salsa's confidence-building trail hardtail. Built for riders who want to start discovering their local trail systems, Rangefinder offers geometry and spec designed for the perfect introduction to mountain biking. Rangefinder opens up singletrack and doubletrack adventures and offers provisions for bikepacking setups so riders can expand their off-road repertoires. Rangefinder is mountain biking for the masses. - 6061-T6 alloy frame - Internally-routed shift, brake and dropper post housing - 129 mm suspension fork and dropper post - 1x drivetrain keeps shifting simple with plenty of gear range - Hydraulic brakes offer confident stopping power - Compatible with 29" or 27.5 plus wheels and tires - Carry what you need with the integrated top tube bag mount, two bottle cage mounts in the frame on M, L, and XL sizes, one accessory mount under the down tube, and rear rack mounts

Thrill Seeker The Habit LT is a progressive trail mountain bike that is down for the ups but lives to get down. Precisely tuned for controlled chaos. Highlights - Full Carbon frame / SRAM GX Eagle 12-speed drivetrain - Rockshox Pike Lyrik Select+ 150mm fork / Super Deluxe Select+ shock - SRAM Code R 4-piston hydraulic discs / DownLow dropper post Built for you The Habit geometry is uniquely size specific. With our Proportional Response Design, everything from the suspension layout to, the geometry —even the length of the chain stays — is completely customized by size. Performance built, just for you. Calibrated for Control Boasting a slacker head tube angle of 64.7° and laid-back seat tube at 77°, the Habit LT puts you in an optimal position to shred the descents and control your steed with unshakable confidence. Easy to love Keeping things simple and easy for the rider with threaded BBs, universal derailleur hanger, standard shock mount, internal cable routing, and an updated 55mm chain line standard for tire clearance. All designed to make it as easy as possible to live with and to love.

Horsethief is one bike for many trails. From finessing local loops to savoring new destinations, Horsethief has your back. It's capable of pushing through technical terrain, instills confidence while riding aggressively, and pairs well with beautiful vistas and a post-ride beverage. - Wheel Size: 29", 27.5+ - Front Axle: 15mm Thru x 110mm - Brake Type: Disc - Fork Type: Suspension - Frame Material: Aluminum - TT (Effective): 615 - Rear Axle: 12mm Thru x 157mm - Frame Type: Suspension - Aluminum frame and Split Pivot suspension design with 120mm of efficient travel, remaining fully active under braking while supportive throughout its travel, paired with a 140mm suspension fork - A short stem paired with long top tube, combined with a 67-degree head tube angle provides descending confidence, yet balances overall wheelbase length and slow speed maneuverability - Every size fits two full-size bottles in the triangle; Anything Bracket and top tube mounts boost cargo space for pack-free riding bliss - Super Boost 157 x 12mm rear hub spacing combined with a standard width bottom bracket results in a 432mm chainstay length that's 5mm shorter than previous-generations - Rear flip chip adjusts head tube angle and bottom bracket height for terrain, wheel size, and personal preference - Spec'd with a 29 x 2.5" front and 2.4" rear wheel/tire combination, but can accommodate a range of additional sizes of 27.5 x 2.8 - 3.0" and 29 x 2.2 - 2.6"

Cassidy SLX is built for more than just getting downhill the fastest. Sure, the 6061-T6 aluminum frame is up for all the trail punishment you can put it through. And the RockShox Super Deluxe Select+ shock and ZEB R fork have your back with 165 mm rear and 180 mm of suspension travel on tap. Cassidy's geometry and our Split Pivot suspension design ensure your tires stick to the trail, whether you're hurtling downhill or climbing back up for another lap. Unlike other enduro bikes, Cassidy features on-bike storage, such as a tube strap spot, a top tube mount, and full-size bottle mount. This lets you extend your ride time or just get the sweaty pack off your back. With a Shimano SLX 1 x 12 drivetrain and four-piston brakes, you're equipped for any enduro course or trail day. KEY FEATURES: SPLIT PIVOT® REAR SUSPENSION SYSTEM: Split Pivot provides a host of impressive suspension characteristics because the system isolates pedaling forces and braking forces from each other, allowing us to tune and optimize the bike for both independently. The concentric rear axle pivot, in conjunction with precise wheel link, brake link, and control link placement, results in: Excellent bump compliance / Incredible pedaling efficiency / Smooth and predictable braking throughout travel / Maximum traction. SPLIT PIVOT + Split Pivot + is our suspension development philosophy that allows riders to swap suspension travel within a single chassis. Flip Chip 2.0 Integrated into the shock link mount, Flip Chip 2.0 allows simple, quick adjustments to bottom bracket height and head tube angle to account for the rider’s personal preference, terrain, or wheel size and tire diameter. MULLET BUILD COMPATIBILITY Mullet build compatibility lets riders run a 29" wheel in the front and a 27.5" wheel in the back with minimal impacts to geometry.

Horsethief is one bike for many trails. From finessing local loops to savoring new destinations, Horsethief has your back. It’s capable of pushing through technical terrain, instills confidence while riding aggressively, and pairs well with beautiful vistas and a post-ride beverage. - Wheel Size: 29", 27.5+ - Front Axle: 15mm Thru x 110mm - Brake Type: Disc - Fork Type: Suspension - Frame Material: Carbon - TT (Effective): 593 - Rear Axle: 12mm Thru x 157mm - Frame Type: Suspension - Carbon frame and seat stays featuring the Split Pivot suspension design with 120mm of efficient travel, remaining fully active under braking while supportive throughout its travel, paired with a 140mm suspension fork - A short stem paired with a long top tube, combined with a 67-degree head tube angle provides descending confidence, yet balances overall wheelbase length and slow speed maneuverability - Every size fits two full-size bottles in the triangle; Anything Bracket and top tube mounts boost cargo space for pack-free riding bliss - Super Boost 157 x 12mm rear hub spacing combined with a standard width bottom bracket results in a 432mm chainstay length that’s 5mm shorter than previous-generations - Rear flip chip adjusts head tube angle and bottom bracket height for terrain, wheel size, and personal preference - Spec’d with a 29 x 2.5" front and 2.4" rear wheel/tire combination, but can accommodate a range of additional sizes of 27.5 x 2.8 - 3.0" and 29 x 2.2 - 2.6"

Timberjack is Salsa's aggressive trail hardtail. Its progressive trail geometry is stable on descents and technical sections, while the Alternator 2.0 dropouts allow for adjustable chainstay length to dial in ride characteristics. Ample accessory mounts and dual wheel size compatibility add more versatility to the package, making Timberjack a well-rounded ripper that likes to party. - 6061-T6 alloy frame - Aggressive trail geometry - 130 mm fork and dropper post provide capability in technical terrain - Alternator 2.0 dropouts expand drivetrain and setup options - Short chainstays and long front-center provide agility and stability on the trail - Front triangle space is maximized for frame bag use - Internal cable routing - Compatible with 27.5+ or 29" wheels

Timberjack is Salsa's aggressive trail hardtail. Its progressive trail geometry is stable on descents and technical sections, while the Alternator 2.0 dropouts allow for adjustable chainstay length to dial in ride characteristics. Ample accessory mounts and dual wheel size compatibility add more versatility to the package, making Timberjack a well-rounded ripper that likes to party. - 6061-T6 alloy frame - Aggressive trail geometry - 130 mm fork and dropper post provide capability in technical terrain - Alternator 2.0 dropouts expand drivetrain and setup options - Short chainstays and long front-center provide agility and stability on the trail - Front triangle space is maximized for frame bag use - Internal cable routing - Compatible with 27.5+ or 29" wheels

Beargrease is our fat tire bike built to go faster than you knew fat tire bikes could go. The super-light frame and fork and the sure-footed rollover of 27.5 x 4.0” wheels and tires cover challenging terrain quickly. Versatile frame and fork mounts let you carry everything you need for the backcountry. Test yourself in a snowy endurance race or pack your camping gear and embark on a long-distance overnight bike trip. - Full carbon frame with super stable geometry, combined with a 100mm suspension corrected carbon fork for precise handling - Bearpaw Carbon fork - 12 x 197mm rear spacing, compatible with 170/177 Salsa Alternator rear rack - Top tube mounts for Salsa EXP Series Toptube Bag or K-edge computer mount - Internally sleeved cable routing, dropper post compatible and 1x-specific frame design - Compatible with multiple wheel sizes

Beargrease pairs a race-ready carbon frame with the capability of fat tires for the ultimate groomed-trail machine. Its trail geometry, dropper post, and 27.5" wheels grant you confidence in loose corners and descents and make for an all-season ripper. Frame and fork mounts for extra bottles and cargo make it easier to gear up for your long days out or even overnighters, and the high-performance XT/SLX drivetrain is the icing on the cake. For light-and-quick confidence on any terrain, Beargrease is one of the best carbon fat-tire bikes out there.

Beargrease is our fat tire bike built to go faster than you knew fat tire bikes could go. The super-light frame and fork and the sure-footed rollover of 27.5 x 4.0” wheels and tires cover challenging terrain quickly. Versatile frame and fork mounts let you carry everything you need for the backcountry. Test yourself in a snowy endurance race or pack your camping gear and embark on a long-distance overnight bike trip. - Full carbon frame with super stable geometry, combined with a 100mm suspension corrected carbon fork for precise handling - Bearpaw Carbon fork - 12 x 197mm rear spacing, compatible with 170/177 Salsa Alternator rear rack - Top tube mounts for Salsa EXP Series Toptube Bag or K-edge computer mount - Internally sleeved cable routing, dropper post compatible and 1x-specific frame design - Compatible with multiple wheel sizes

The Heyday! is Salsa’s most versatile fat bike, designed and engineered to excel in a wide variety of conditions. The frame utilizes 197 mm rear spacing to accommodate up to 5" tires, and the 100 mm threaded bottom bracket allows a wide range of crank (Q-factor) choices. Alternator 1.0 dropouts allow for short chainstays and easily support single speed or geared drivetrain options. The Heyday! can do it all. - Designed with a low and rearward center of gravity for increased stability when navigating challenging terrain - Bearpaw Aluminum fork with two sets of Three-Pack mounts - Aluminum frame includes two bottle mounts inside frame triangle and down tube mounts for a bottle, pump, repair kit, or other accessory - Alternator 1.0 dropouts - Full-length internal cable housing routing, internal dropper post routing, and 1x or 2x drivetrain compatible - Compatible with Salsa Alternator 190 Rear Rack using Salsa Rack-Lock or Post-Lock - aklsdjfl

The Lowside is the bike that gets you across town for a quick rip on singletrack, then over to the bar for a night out. It’s the bike you turn to when you’re not entirely sure what the night has in store. It’s the bike to grab when you want to have just much fun riding to the trail as you do from the trail itself. Singlespeeding is an integral part of Surly’s DNA, and the Lowside continues the tradition, by taking a simpler approach to trail riding. - 100% Surly 4130 Chromoly frame, main triangle is double-butted; 1-1/8" threadless Chromoly fork - Singlespeed “specific” (derailleur hanger but no Trip Guides) - Dropper post routing - Gnot-Boost rear spacing - Front and rear thru-axle - 26 x 3” or 27.5 x 2.8” tire clearance

The Krampus is the bike that started it all — the plus-size movement that is. Krampus features Surly’s Gnot-Boost rear hub spacing of 145mm; compatible with Boost 148 x 12mm thru-axle, 142 x 12mm thru-axle and 135mm quick-release hubs. - 100% Surly 4130 CroMoly steel frame and fork; double-butted main triangle and 44mm headtube - New tube-set uses the same trumpet tubes found on 2017 Karate Monkey frame - Gnot-Boost adjustable rear dropouts - Internal dropper seatpost routing - 30.9mm seat tube - Designed to fit up to 29 x 3.0” tires

As a highly versatile touring bike, the Bridge Club hits the sweet spot that separates on- and off-road excursions. The simplistic design makes it fully adept to handle a full rack and pannier setup, frame bags, or any combination of the two. It doesn’t feel sluggish on paved shortcuts, but can also hold its own on dirt detours. If you’re feeling a little zesty on your next road tour, you won’t be ill-prepared for reroutes through the woods. The Bridge Club is designed to handle it all. - 100% Surly Chromoly frame, main triangle is double-butted; 1-1/8" threadless Chromoly fork - Rack, fender, and four sets of three-pack mounts - Disc brake-specific, single-position vertical rear dropout makes it less intimidating than other bikes in the category - Clearance for 700 x 47mm (with or without fenders) or 27.5 x 2.8" tires (27.5 x 2.6" with fenders)

The Karate Monkey features updated, progressive trail geometry, our custom trumpet tubeset and Surly’s Gnot-Boost rear dropout system. Available in a variety of colors, with multiple drivetrain and wheel size configurations. - 100% Surly Chromoly steel frame and fork; double-butted main triangle and 44mm headtube - The tubeset uses the same trumpet tubes found on Instigator 2.0 frame - Adjustable rear dropouts with 145mm Gnot-Boost spacing. Works with 142, 148 12mm thru, as well as 135mm w/ 10/12 washer - Internal dropper seatpost routing with 30.9mm seat tube ID - Clearance for 29 x 2.55 or 27.5 x 3 tires