Gravel & Cyclocross

We think by now, most of you get what Straggler is. It’s a madly versatile bike that can be used for most types of riding and riding surfaces. Better still is that you now have the option of 650b wheel size. 650b wheels were popular for a long time many years ago on ‘Constructeur’ style bicycles and we all know how real stuff was back in the day…650b wheels strike a nice balance between the benefits of both 26” and 700c sizes. The smaller wheel allows smaller riders to fit well on smaller frames, produces a stronger wheel, makes fitting big-ass tires easier and are more agile than their larger counterparts. Straggler has disc caliper mounts instead of rim brake studs. It’ll accept rotors up to 160mm. The rear dropouts are unique, too. They’re a partially closed horizontal design that accommodates singlespeed or geared drivetrains. They feature stop screws that thread in from the rear to further secure the wheel and to position the rear wheel for optimal shifting, plus a forward-mounted stop screw on the drive side to keep the wheel from slipping forward under the force of your gargantuan legs. The rear dropouts are spaced 135mm instead of 132.5mm like the Cross-Check simply because there are far more options for disc hubs in this spacing. Straggler 650b has braze-ons for fenders, racks and bottle cages. The geometry is slightly different, with angles and tube lengths very close but not identical to the Cross-Check, but like the Cross-Check it’s ready to take you just about anywhere. It’s a day tripper and a weekender. It’s a ‘rough road’ road bike. It’s a cyclocross bike with no pretense about racing. It’s a utilitarian townie. It’s a light-duty touring bike. It’s an all-weather commuter. And when you get tired of one set up, you can swap parts around and turn it into something else. We think that’s pretty neat.

So what is this Straggler anyway? The easy answer is to say that we added disc brakes to a Cross-Check and this is close to accurate. People have asked us to make a disc version of our highly versatile Cross-Check for a long time now and almost everything about the two are very similar. Straggler is slightly different, though. The most obvious difference of course is that the Straggler has disc caliper mounts instead of rim brake studs. It’ll accept rotors up to 160mm. The rear dropouts are unique, too. They’re a partially closed horizontal design that accommodates singlespeed or geared drivetrains. They feature stop screws that thread in from the rear to further secure the wheel and to position the rear wheel for optimal shifting, plus a forward-mounted stop screw on the drive side to keep the wheel from slipping forward under the force of your gargantuan legs. The rear dropouts are spaced 135mm instead of 132.5mm like the Cross-Check simply because there are far more options for disc hubs in this spacing. Straggler shares all of the Cross-Check’s braze-ons for fenders, racks and bottle cages. The Straggler’s geometry is slightly different, with angles and tube lengths very close but not identical to the Cross-Check, but like the Cross-Check it’s ready to take you just about anywhere. It’s a day tripper and a weekender. It’s a ‘rough road’ road bike. It’s a cyclocross bike with no pretense about racing. It’s a utilitarian townie. It’s a light-duty touring bike. It’s an all-weather commuter. And when you get tired of one set up, you can swap parts around and turn it into something else. We think that’s pretty neat.

With its flat handlebar, comfortable upright positioning, and smooth, powerful disc brakes, Roam combines the best qualities of a road bike and a mountain bike. Now you can follow your own route wherever it goes. KEY PERFORMANCE FACTORS - Agility and control Updated flat-bar frame geometry puts the rider in a position that balances efficiency with stability, and disc brakes give you added control on rugged roads or dirt. - Smooth-riding comfort The D-Fuse seatpost and suspension fork absorb road shocks and vibrations, and EasyRide Tubeless tires let you run lower pressure for a smoother ride quality and a reduced risk of flats. - Integrated rack mounts Compatible with rear racks, allowing easy cargo capacity for daily trips or longer treks. TECHS AND FEATURES: - ALUXX ALUMINUM TECHNOLOGY This Performance level frame material features 6061 alloy with single-butted tubes to produce strong, lightweight framesets for a variety of different bikes and riding styles. - D-FUSE SEATPOST The proprietary “D” shaped composite seatpost damps vibration, resulting in a smooth, compliant ride.

Steel Commuter and Gravel Bike Preamble is a hard-boiled steel commuter built for comfort, durability, and buffoonery on pavement and gravel. Nothing More is Needed. Nothing Less Will Do. The challenge was thus: Build a serious steel bike and give it only the attributes that matter most. Make it quick and comfortable on pavement, as well as confident and compliant on degraded surfaces. What the Enginerds put forth is Preamble, a pavement and gravel utility worker that proves you don't need to cut corners or clip coupons to make a more affordable steel bike. You just need to keep it simple. Preamble can run racks and fenders and carry a couple water bottles. Surly was raised on stealing basic cable, after all. Smooth and efficient on asphalt, Preamble's double-butted main triangle provides a resplendent ride feel and withstands abuse from life's inevitable potholes. Make it your own with flat bars, drop bars, a basket, or bags. On the road to steel euphoria, Preamble is the gateway drug. Let facts be submitted to a candid world: - Offered in flat-bar and drop-bar configurations - Easy T-Shirt sizing to fit nearly every rider (XS, S, M, L, XL) - Sloping top tubes on XS and Small frames for improved standover and comfort - To offer the best rider experience for every frame size, XS and S frames get 650b wheelsets while M–XL get 700c - Custom-cast single-position vertical dropout

- 9 Speed - Alloy frame & fork - Bengal cable disc brakes

- 16 Speed - Reynolds CrMo frame - Shimano Claris drivetrain - Weinmann U28 TL, Tubeless Ready wheelset - Promax Adventure handlebar

Some roads are smooth, others are rough. This smooth-riding all-rounder handles it all, taking you from the main route to more adventurous options with confidence and control. Contend AR combines a smooth, responsive ride quality with an ability to handle adventurous new routes. Disc-brake integration and generous tire clearance (up to 38mm) put you in control, even on rough roads. A D-Fuse composite seatpost dampens road vibrations, giving you a smoother, more enjoyable ride experience. This is a true all-rounder for road riders who have a thirst for adventure.

- 16 Speed - Carbon fork - Shimano Claris drivetrain - Tektro dual piston cable disc brakes - FSA Orbit headset - Weinmann U28 TL, Tubeless Ready wheelset - Promax Adventure handlebar

Steel Commuter and Gravel Bike Preamble is a hard-boiled steel commuter built for comfort, durability, and buffoonery on pavement and gravel. Nothing More is Needed. Nothing Less Will Do. The challenge was thus: Build a serious steel bike and give it only the attributes that matter most. Make it quick and comfortable on pavement, as well as confident and compliant on degraded surfaces. What the Enginerds put forth is Preamble, a pavement and gravel utility worker that proves you don't need to cut corners or clip coupons to make a more affordable steel bike. You just need to keep shit simple. Preamble can run racks and fenders and carry a couple water bottles. Surly was raised on stealing basic cable, after all. Smooth and efficient on asphalt, Preamble's double-butted main triangle provides a resplendent ride feel and withstands abuse from life's inevitable potholes. Make it your own with flat bars, drop bars, a basket, or bags. On the road to steel euphoria, Preamble is the gateway drug. Let facts be submitted to a candid world: - Offered in flat-bar and drop-bar configurations - Easy T-Shirt sizing to fit nearly every rider (XS, S, M, L, XL) - Sloping top tubes on XS and Small frames for improved standover and comfort - To offer the best rider experience for every frame size, XS and S frames get 650b wheelsets while M–XL get 700c - Custom-cast single-position vertical dropout

- 18 Speed - Carbon fork - Shimano Sora drivetrain - Weinmann U28 TL, Tubeless Ready wheelset - FSA Omega 2-piece cranks - Shimano HG200-9, 11-36T cassette - 12mm Thru-axles

The all-new Revolt features a lightweight ALUXX aluminum frame with updated gravel geometry including a longer reach and lower bottom bracket for added stability. A flip chip on the rear dropout adjusts wheelbase and tire clearance, and you can choose the included D-Fuse seatpost for maximum compliance or switch to a 30.9mm round or dropper post. The frame is integrated for disc brakes and it has clearance for larger tires up to 53mm.

SOME ROADS ARE SMOOTH, OTHERS ARE ROUGH. THIS SMOOTH-RIDING ALL-ROUNDER HANDLES IT ALL, TAKING YOU FROM THE MAIN ROUTE TO MORE ADVENTUROUS OPTIONS WITH CONFIDENCE AND CONTROL. KEY PERFORMANCE FACTORS Balanced road geometry Frame is specifically engineered to produce a balanced, all-rounder feel that blends confident rider positioning with agile cornering and acceleration. Smooth ride quality Innovative D-Fuse seatpost reduces road shocks and vibrations, and a Giant WheelSystem lets you run tubeless tires up to 38mm for a smoother ride quality and reduced risk of flats. Total control Seamless disc brake integration, including flat mounts and 12mm front and rear thru-axles, produces more consistent braking power for better control, even in wet weather and on rough roads.

Some roads are smooth, others are rough. This smooth-riding all-rounder handles it all, taking you from the main route to more adventurous options with confidence and control. Contend AR combines a smooth, responsive ride quality with an ability to handle adventurous new routes. Disc-brake integration and generous tire clearance (up to 38mm) put you in control, even on rough roads. A D-Fuse composite seatpost dampens road vibrations, giving you a smoother, more enjoyable ride experience. This is a true all-rounder for road riders who have a thirst for adventure.

Our most popular and versatile model, the Space Horse has become a bit of a cult favorite through its classic styling and ability to handle just about any task or terrain. Ambitious road centuries, gravel racing, loaded touring, looking great while commuting — the Space Horse is equipped for it all. - 612 Select Tubing – a proprietary blend of 4130 double-butted Chromoly tubes, every piece of tubing on every frame size has been carefully chosen to provide the best ride possible - Geometry — Mix between road and randonneuring with a relatively short rear end and a slightly lower bottom bracket than a standard road bike - 12mm front and rear thru-axles, flat-mount disc brakes - Front and rear rack mounts, fender mounts, and pump peg - Fork features ports for internal Dynamo cable routing - Tire Clearance — 43–61cm frames fit 650b x 47mm (650b x 42mm w/fenders); additionally, 49–61cm frames fit 700c x 45mm (700c x 42mm w/fenders) - Signature custom-cast dropout with replaceable derailleur hanger, signature lugged fork crown and custom fork ends, integrated seat collar, pantographed bottom bracket shell, reinforced bottle bosses for three bottle cages

Possibly the most iconic frame associated with Ritchey, the Swiss Cross draws its name from early factory rider, cyclocross and mountain bike legend Thomas Frischknecht. The first iteration of the Swiss Cross in 1994 was a no-holds-barred race machine designed for one thing: ripping through dirt like no other. Captained to numerous victories under Frischi, the Swiss Cross went on to become one of the most revered frames of the Ritchey offering – proving itself a winning combination of Tom’s framebuilding mastery and Frischi’s dominance in racing. As a true ‘cross ripper or a fast gravel racer, the Swiss Cross remains lightweight and compliant, and offers the winning combination of confident responsiveness and razor-sharp handling. Its race-ready geometry will ignite the competitive spirit, while clearance for 40mm tires will appeal to those who’s pursuits reach beyond the course tape. The Swiss Cross is painstakingly TIG-welded with proprietary triple-butted Ritchey Logic steel tubing that now sports an updated one-piece truss design for flat mount brakes - providing as much stiffness and strength of previous mounts while reducing chainstay weight significantly. Whether it's ticking off the grueling miles of a gravel race or leading the charge on bell lap, the new Swiss Cross is more than capable of tackling it all. Go fast. Get dirty.

Straggler is a bikepacking-inspired road/gravel bike mostly at home on pavement but ready for trail duty when called. Born on Gravel. Raised on Pavement Straggler is tuned for cross-over exploration on a wide variety of terrain conditions. It's a day-tripper and a weekender. It's a "rough road" road bike, a cyclocross bike with no pretense about racing, a utilitarian townie, a light-duty touring bike and an all-weather commuter. It's a steel gravel bicycle that thrives on the road. Think of it as a "mountain biker's road bike." If you only have room for one bike in your life, Straggler can (and should) be your one and only. Straggler's capabilities go well beyond asphalt. It also lends itself well to light touring setups. We're talking frame bags, seat bags, and "credit card touring" rather than full-blown touring. Straggler also handles our 8- and 24-Pack Racks well, so you have some heavier-duty loading options. - Accommodations for racks and fenders - Forward-exiting horizontal dropouts for singlespeed compatibility and wheelbase adjustability - Clearance for 650B x 41mm tires with fenders!

Straggler shares all of the Cross-Check's braze-ons for fenders, racks and bottle cages, and like the Cross-Check its ready to take you just about anywhere. It's a day tripper and a weekender. It's a 'rough road' road bike. It's a cyclocross bike with no pretense about racing. It's a utilitarian townie. It's a light-duty touring bike. It's an all-weather commuter. And when you get tired of one set up, you can swap parts around and turn it into something else. - Fender eyelets at the dropouts, front and rear rack bosses and dual water bottle mounts, downtube shifter mounts - 100% Surly proprietary 4130 chromoly tubing. TIG-welded, double-butted main triangle - Forward-exiting horizontal dropouts with adjusters give you singlespeed compatibility and wheelbase adjustability to help you fit the tires and fenders you want to run with that drivetrain you want to run. - Frame is ED Coated for increased life expectancy

Straggler is a bikepacking-inspired road/gravel bike mostly at home on pavement but ready for trail duty when called. Born on Gravel. Raised on Pavement Straggler is tuned for cross-over exploration on a wide variety of terrain conditions. It's a day-tripper and a weekender. It's a "rough road" road bike, a cyclocross bike with no pretense about racing, a utilitarian townie, a light-duty touring bike and an all-weather commuter. It's a steel gravel bicycle that thrives on the road. Think of it as a "mountain biker's road bike." If you only have room for one bike in your life, Straggler can (and should) be your one and only. Straggler's capabilities go well beyond asphalt. It also lends itself well to light touring setups. We're talking frame bags, seat bags, and "credit card touring" rather than full-blown touring. Straggler also handles our 8- and 24-Pack Racks well, so you have some heavier-duty loading options. - Accommodations for racks and fenders - Forward-exiting horizontal dropouts for singlespeed compatibility and wheelbase adjustability - Clearance for 700c x 41mm tires with fenders!

Straggler shares all of the Cross-Check's braze-ons for fenders, racks, and bottle cages, and like the Cross-Check its ready to take you just about anywhere. It's a day tripper and a weekender. It's a 'rough road' road bike. It's a cyclocross bike with no pretense about racing. It's a utilitarian townie. It's a light-duty touring bike. It's an all-weather commuter. And when you get tired of one set up, you can swap parts around and turn it into something else. - Fender eyelets at the dropouts, front and rear rack bosses and dual water bottle mounts, downtube shifter mounts - 100% Surly proprietary 4130 chromoly tubing. TIG-welded, double-butted main triangle - Forward-exiting horizontal dropouts with adjusters give you singlespeed compatibility and wheelbase adjustability to help you fit the tires and fenders you want to run with that drivetrain you want to run. - Frame is ED Coated for increased life expectancy

Based around an adaptable steel frame, our Arise range is ready to follow whatever road you point it down. A simple, versatile bike, our Arise uses a single-speed drivetrain so you can focus on riding, not maintenance. The fast wheels, wide tires, and flared bars mean there’s not much this bike cannot handle, from trails to commuting. Infinitely adaptable with fittings for mudguards and a rack, and you even have the option of converting the frame and hub to run an 11-speed drivetrain.

A World Cup-winning design ridden to multiple Elite level wins by pro rider Gosse van der Meer. Mix it with the very best on our top-flight racer. Built around an aggressive carbon chassis, its weight is kept to an absolute minimum to deliver you to the bell lap with enough energy left to boss the finishing sprint.

The Grappler is Surly's dedicated drop-bar trail bike. With mountain geo designed around a comfortable, confident drop-bar hand position, it's lively and responsive on single-track, double-track, and other degraded surfaces. Ready to haul essential gear for all-day dirt rides and quick bikepacking excursions, captured thru-axles front and rear provide ideal stiffness and handling. Built around 27.5" wheels and compatible with internally geared hubs and single-speed setups, Surly's tried-and-true Gnot-Boost spacing allows riders to run 142mm or 148mm rear hubs. - 100% Surly Chromoly steel frame and fork, featuring Surly's proprietary 'Natch tubing, double-butted main triangle, 1-1/8" headtube, non-suspension corrected. - Horizontal-slotted dropout, Surly Gnot-Boost spacing. - Seat stay-mounted bottle bosses on all sizes except XS, plus three-pack mounts at the top and bottom of the down tube and stealth dropper post routing. - E.D. coated frame for increased life expectancy. - 27.5 x 2.8" tire clearance (with or without fenders).

TAKE YOUR COMMUTES AND FITNESS RIDES TO THE NEXT LEVEL WITH THE THRIVE ADVANCED GX, BUILT FOR EXPLORING BOTH GRAVEL AND PAVED PATHS. WITH A LIGHTWEIGHT FRAME, CONFIDENCE-INSPIRING TIRES, AND FRAME MOUNTS TO CARRY YOUR ESSENTIALS, THIS BIKE IS READY TO ACCOMPANY YOU ON ANY ADVENTURE. KEY PERFORMANCE FACTORS Light and Agile The Thrive Advanced GX features a lightweight and nimble Advanced-grade composite frame and fork, balanced geometry, and flat handlebar for ultimate efficiency and control. Adventure-ready Ride comfortably and confidently on bumpy roads and gravel with pressure-relieving grips and saddle, as well as a shock-absorbing D-Fuse seatpost. With an array of frame mounts, you can easily add extra water bottle cages or a rear rack to accommodate all your gear for longer rides and adventures. Functional Versatility The carbon flip chip – dropout allows you to easily adjust the geometry and tire clearance, giving you more versatility and customization options to suit your riding style and terrain. Switch to the short position for quicker handling and a maximum tire clearance of 40c, or choose the long position for stability at speed and increased tire clearance up to 45c. TECHS & FEATURES ADVANCED COMPOSITE TECHNOLOGY Liv's High-Performance Grade raw carbon material is used to produce this frameset in our own composite factory. Using state-of-the-art materials and manufacturing techniques, Liv's Advanced-Grade Composite frames are designed to offer light weight and stiffness with optimal compliance. D-FUSE SEATPOST The proprietary "D" shaped composite seatpost damps vibration, resulting in a smooth, compliant ride. OVERDRIVE Designed to provide precise front-end steering performance, this fork steerer tube technology uses oversized headset bearings (1 1/4" lower and 1 1/8" upper for road, 1 1/2" lower and 1 1/8" upper for mountain) and tapered steerer tube work in conjunction to provide optimal steering stiffness. TUBELESS SYSTEM Engineered with proprietary Dynamic Balanced Lacing technology, this tubeless-ready composite WheelSystem delivers superior efficiency, pinpoint control, and comfort.

A Cross Monster Built for Exploration Taking inspiration from our famed cross bikes, the Gorilla Monsoon will send you far into the unknown with comfort, style, and elegance. Do-It-All Dirt Solution A sweet beast designed to handle double track, gravel, bikecamping, and the pursuit of good times, this nimble, do-it-all dirt solution is ready to send cross racers, dirt tourists, and backcountry explorers on the ride of a lifetime. Mounts for Fenders and Racks in Front and Back Conquer wet roads, fully loaded bikepacking trips, and the gnarliest of grocery lists Tire Clearance Built around a 27.5 x 2.4" platform, the Gorilla Monsoon offers clearance for 700c x 42mm tires to deliver complete tire freedom 612 Select Tubing Selected specifically for sporty handling on the course, comfort on tours, and maximum fun on-road or off Dropper Seatpost Ready to rock steep descents on the trail or pavement Flat-mount brakes Flat-mount disc brakes offer clean aesthetics and compatibility with modern product standards

Our most popular and versatile model, the Space Horse has become a bit of a cult favorite through its classic styling and ability to handle just about any task or terrain. Ambitious road centuries, gravel grinding, loaded touring, looking great while commuting — the Space Horse is equipped for it all. - 612 Select Tubing – a proprietary blend of 4130 double-butted Chromoly tubes, every piece of tubing on every frame size has been carefully chosen to provide the best ride possible - Geometry — Mix between road and randonneuring with a relatively short rear end and a slightly lower bottom bracket than a standard road bike - 12mm front and rear thru-axles, flat-mount disc brakes - Front and rear rack mounts, fender mounts, and pump peg - Fork features ports for internal Dynamo cable routing - Tire Clearance — 43–61cm frames fit 650b x 47mm (650b x 42mm w/fenders); additionally, 49–61cm frames fit 700c x 45mm (700c x 42mm w/fenders) - Signature custom-cast dropout with replaceable derailleur hanger, signature lugged fork crown and custom fork ends, integrated seat collar, pantographed bottom bracket shell, reinforced bottle bosses for three bottle cages

A modern twist on an age-old discipline, the Audax AL is an accomplished bicycle. Wide, generous tires confidently roll over any surface, guided by a carbon fork to reduce weight with plenty of clearance to accommodate wider treads plus mudguards. Take your pick on how to distribute your cargo with multiple mounting fixings across the frame and fork, as well as options for panniers and bike packing bags. Short chainstays and an engaged front end make for a responsive bike geometry, which feels alert and responsive even when fully loaded. To complete the bike, 650B wheels, a Microshift XLE 11-speed groupset, and a clutch derailleur ensure comfort and reliability wherever you point your nose. Employing short chainstays, it's a bike that's happy to change lanes quickly, but yet remains solidly planted thanks to a larger-than-average contact patch.

The Midnight Special is an endurance road bike designed to provide comfort and speed on those all-day rides that extend well beyond fresh pavement. It excels on pot-holed, deteriorating pavement and the occasional long stretch of gravel. The Midnight Special’s 700c tires eat up road chatter and absorb all the bumps in the road for a much more comfortable ride. - 100% Surly Chromoly frame, main triangle is double-butted; 1-1/8" threadless Chromoly fork - Rack, fender, and three sets of water bottle mounts - Flat-Mount disc brakes - 44mm head tube - Tire Clearance: 27.5 x 2.35" (w/o fenders), 700c x 42mm (w/o fenders), 650b x 50 (w/ fenders), 700c x 38mm (w/ fenders)

Midnight Special is a road plus bike designed to provide comfort and speed on those all-day rides that extend well beyond fresh pavement. Midnight Special shines on pot-holed, deteriorating pavement and the occasional long stretch of gravel. Its 650B road plus tires eat up road chatter and absorb all the bumps in the road like the champion it was designed to be. When it comes to road bikes, we just want to toss a few bananas into our pockets and see where the road takes us. We seek out varied surfaces on our rides and frequently go from pavement to gravel to worse pavement. Midnight Special allows us to accomplish all of that quite comfortably. - Higher volume tires allow better fine tuning of tire pressure on varying surfaces and create a wider contact patch for increased traction - Modern road standards like flat-mount disc brakes, 12mm front and rear thru-axles, and a 44mm head tube - Clearance for 650B x 60mm or 700c x 42mm tires without fenders (650B x 50mm or 700c x 38mm with fenders)

A modern twist on an age-old discipline, the Audax AL is an accomplished bicycle. Wide, generous tires confidently roll over any surface, guided by a carbon fork to reduce weight with plenty of clearance to accommodate wider treads plus mudguards. Take your pick on how to distribute your cargo with multiple mounting fixings across the frame and fork, as well as options for panniers and bike packing bags. Short chainstays and an engaged front end make for a responsive bike geometry, which feels alert and responsive even when fully loaded. To complete the bike, 650B wheels, a Microshift XLE 11-speed groupset, and a clutch derailleur ensure comfort and reliability wherever you point your nose. Employing short chainstays, it's a bike that's happy to change lanes quickly, but yet remains solidly planted thanks to a larger-than-average contact patch.

Fast gravel, rough gravel, pavement or dirt. However you choose to roll, this bike does it all. A new composite frameset and adjustable wheelbase make it more capable than ever. With a lightweight Advanced-grade composite frame that's engineered for compliance, Revolt Advanced lets you push your limits on variable terrain. A composite fork eats up bumps, and the D-Fuse seatpost and handlebar absorb shocks and vibrations. A flip chip on the rear dropout adjusts wheelbase and tire clearance, and you can choose the included D-Fuse seatpost for maximum compliance or a 30.9mm round or dropper post. Details including a smart mount system for racks and accessories give you a head start on any gravel riding mission. KEY PERFORMANCE FACTORS Fast and light New Advanced composite frame and fork save more than 160 grams compared to previous model. Updated geometry includes a lower bottom bracket, longer reach and steeper headtube angle for improved acceleration and climbing. Tuned compliance New frame features thinner, dropped seatstays to absorb road shocks and vibrations. D-Fuse handlebar and seatpost work as a system to add compliance without sacrificing stiffness while cornering, sprinting or climbing. Adaptable to the terrain A flip chip on the rear dropout adjusts the wheelbase short for quicker handling, or long for improved stability at speed. The long setting allows for larger diameter tires up to 53mm. You can also choose the included D-Fuse seatpost for maximum compliance, or switch to a 30.9mm round or dropper post.