Bikes

Riding a bike is fun, and having fun on the trail was at the front of our minds when creating the Rift Zone 27.5. Built around our MultiTrac suspension system, the Rift Zone 27.5 is our most playful and fun short travel suspension trail bike to date. Entry level through to high-performance spec, everyone can fall in love with mountain biking over and over again with the Rift Zone 27.5.

The Stinson brings a new level of comfort and control to your ride. This model has a lightweight Series 1 aluminum frame with low standover, an ergonomic handlebar, plush saddle, and versatile, high-volume 27.5" tires with mixed tread for control on a variety of surfaces. Design features include our Comfort Control Geometry with upright seating and the ability to touch the ground with the forefoot, while maintaining proper saddle height for pedaling efficiency. Series 1 Aluminum Frame The Stinson features a Series 1 6061 aluminum frame with exceptionally low standover, disc brake mounts, rack and fender eyelets, and high-volume 27.5" wheels. Comfort Control Geometry Marin Comfort Control geometry allows you to touch the ground with your forefoot when the saddle is at the correct height for full pedaling leg extension. 27.5" Tires Large volume 27.5 x 2.35" tires are capable and comfortable across a range of surfaces. Wide-Range Gearing Wide-range, 1x gearing is simple to use and offers as large if not larger of a gear range than multi-chainring bikes of the past. - Aluminum frame w/CrMo fork - Shimano Tourney/Altus 1x7 drivetrain - Power CX7 mechanical disc brakes - Marin Comfort touch points

The Donky Jr. 20" is built around a lightweight aluminum alloy frame and stout steel fork, with the addition of a dependable and smooth-shifting Shimano 6-speed drivetrain—perfect for a growing rider who is able to get out on longer rides.

The Kentfield offers a hybrid blend of speed for efficient riding and the upright and confident position of a mountain bike. With multi-terrain tires and full rack and fender mounts, it's built for short to medium distance commutes and bike path fun rides. The Kentfield adds the possibility of further exploration outside of your regular commutes or path cruising. Wide-range and simple single chainring drivetrains and lightweight Series 1 aluminum frames make the Kentfield a line of comfortable and sporty bikes for an active lifestyle. Series 1 Aluminum Frame The Kentfield features a Series 1 6061 aluminum frame with disc brake mounts and rack and fender eyelets and fast rolling, multi-surface capable 700c wheels. CrMo BMX Inspired Fork The stylish CrMo BMX style fork has straight blades, disc mounts, and BMX inspired dropouts. Hybrid Geometry The Kentfield features upright seated hybrid geometry that mixes the upright position of a mountain bike with the efficiency of a pavement bike. Wide-Range Gearing Wide-range, 1x gearing is simple to use and offers as large if not larger of a gear range than multi-chainring bikes of the past. - Series 1 aluminum frame - MicroSHIFT Advent X 1x10 drivetrain - Power CX7 mechanical disc brakes - Marin Adventure Plush saddle

The Bobcat Trail family of mountain bike hardtails are designed for the rider looking for a capable singletrack machine, featuring everything you need to have a great ride. The heart and soul of the ride stem from the lightweight, Series 2 aluminum alloy frame, which features long and low trail geometry and room for either 27.5" or 29" wheels. 120mm of rock garden-ready travel adds to the bike's trail capability and fun factor. All Bobcat Trail models feature internal cable routing, hydraulic disc brakes, and wide-range off-road specific drivetrains. - Series 2 6061 Aluminum frame - SR Suntour XCM HLO 120mm travel fork - Shimano Altus 2x8 drivetrain - Tektro M275 hydraulic disc brakes

A tough, fast rig for urban riding, the Lombard 1 can take you to work, get you to the store, and take daily-use abuse day in and day out, all without so much as blinking. The Lombard was designed with clearance for up to 700x45c tires for comfort and control across a wide variety of surfaces. All Lombard frames feature internal cable routing for a clean look. Additional features include full rack and fender mounts along with reflective decals that help to maximize low-light visibility for commuting or just getting in those extra miles after the sun sets. - Series 2 Lombard 6061 Aluminum frame and Straight-Blade fork - Shimano Sora 2x9 drivetrain - Tektro Road Mechanical Disc brakes - Marin Aluminum Double Wall rims w/Vee Tire G-Sport 700x40c tires

The Kentfield offers a hybrid blend of speed for efficient riding and the upright and confident position of a mountain bike. With multi-terrain tires and full rack and fender mounts, it's built for short to medium distance commutes and bike path fun rides. The Kentfield adds the possibility of further exploration outside of your regular commutes or path cruising. Wide-range and simple single chainring drivetrains and lightweight Series 1 aluminum frames make the Kentfield a line of comfortable and sporty bikes for an active lifestyle. Series 1 Aluminum Frame The Kentfield features a Series 1 6061 aluminum frame with disc brake mounts and rack and fender eyelets and fast rolling, multi-surface capable 700c wheels. CrMo BMX Inspired Fork The stylish CrMo BMX style fork has straight blades, disc mounts, and BMX inspired dropouts. Hybrid Geometry The Kentfield features upright seated hybrid geometry that mixes the upright position of a mountain bike with the efficiency of a pavement bike. Wide-Range Gearing Wide-range, 1x gearing is simple to use and offers as large if not larger of a gear range than multi-chainring bikes of the past. - Series 1 aluminum frame - Shimano Tourney 1x7 drivetrain - Power CX7 mechanical disc brakes - Marin Adventure Plush saddle

The Kentfield offers a hybrid blend of speed for efficient riding and the upright and confident position of a mountain bike. With multi-terrain tires and full rack and fender mounts, it's built for short to medium distance commutes and bike path fun rides. The Kentfield adds the possibility of further exploration outside of your regular commutes or path cruising. Wide-range and simple single chainring drivetrains and lightweight Series 1 aluminum frames make the Kentfield a line of comfortable and sporty bikes for an active lifestyle. Series 1 Aluminum Frame The Kentfield features a Series 1 6061 aluminum frame with disc brake mounts and rack and fender eyelets and fast rolling, multi-surface capable 700c wheels. CrMo BMX Inspired Fork The stylish CrMo BMX style fork has straight blades, disc mounts, and BMX inspired dropouts. Hybrid Geometry The Kentfield features upright seated hybrid geometry that mixes the upright position of a mountain bike with the efficiency of a pavement bike. Wide-Range Gearing Wide-range, 1x gearing is simple to use and offers as large if not larger of a gear range than multi-chainring bikes of the past. - Series 1 aluminum frame - Shimano Tourney 1x7 drivetrain - Power CX7 mechanical disc brakes - Marin Adventure Plush saddle

The Wildcat Trail family crosses boundaries between Trail and Sport mountain bikes, with the Wildcat Trail 3 designed for the female hardtail enthusiast looking for a full-featured trail mountain bike. WOMEN’S FIT GEOMETRY The Wildcat Trail features Women’s Fit Geometry to better fit female riders with components like women’s-specific saddles, narrower bars, and adjustable reach brake levers. 27.5” WHEELS 27.5” wheels fit most riders better and create a lightweight and responsive bike. SERIES 2 ALUMINUM FRAME The Wildcat Trail 3 has a Series 2 6061 butted and hydroformed aluminum frame with a 120mm travel suspension fork and 27.5” wheels.

GRAVEL RIDING Fully loaded bikepacking, fast and light off-road adventures, gravel and CX racing… or simply exploring your favorite tracks and trails. The Marin Headlands is a high-tech, high-spec carbon fiber gravel, and adventure bike that's made to be lightning-fast, confidence-inspiring, and super comfortable on all surfaces. We've taken our own unidirectional carbon fiber frame, added mountain bike-inspired geometry, loads of tire clearance, and a whole heap of mounting points for gear and fenders to create a super versatile, super capable all-terrain dart of a bike. Go 700c with room for up to 45mm tires or 650b up to 47mm. The Marin Headlands 1 offers bags of fun, adventure, and performance without the loftier price point of the mighty Headlands 2. Gravel-specific Shimano GRX groupset, GRX hydraulic brakes, Vee Tire Co tires, and Marin wheels and finishing kit all add up to a whole mountain of fun and adventure. UNIDIRECTIONAL CARBON FIBER FRAME - The Headlands has a unidirectional carbon fiber frame designed to meet the demands of modern gravel and endurance riders and racers with large tire clearance, a 142x12mm thru-axle, and multiple frame eyelets for customized hydration and frame bag needs. TIRE CLEARANCE - The Headlands was designed with clearance for up to 700Cx45 or 650Bx50 tires to handle even the roughest "roads." INTERNAL DROPPER COMPATIBILITY - The Headlands features a seat tube port for internal dropper routing, with the Headlands 2 coming stock with a 105mm/85mm dropper post. REMOVABLE SEATSTAY BRACE - The removable seat stay brace makes it super easy to add fenders for foul weather riding and commuting while maintaining a clean smooth look when you don't need the coverage.

The Gestalt is for the drop bar rider that doesn't want to stick to pavement and can't help but get dirty no matter the route. Long distance commuters and all-weather riders will appreciate features like fender and rack mounts, sure stopping disc brakes, and the comfort larger volume tires provide on unexpected detours. - Series 2 Beyond Road alloy frame - Aluminum fork - Marin aluminum double-wall rims, tubeless-compatible - Shimano Claris 2x8 gearing - Promax cable disc brakes

The Nicasio is for the rider looking for something different and modern, yet with traditional steel construction. Classic lines and CrMo frame tubes have the soul of a classic bike, with the geometry and tire clearance to let riders handle any surface. Beyond Road geometry Beyond Road Geometry offers a blend of endurance road handling with enhanced stability for off pavement use. Steel Frame Construction The Nicasio uses a Series 2 or Series 1 butted 4130 CrMo frame with disc brakes, full fender and rack mounts, and two to three bottle bosses. Disc Brakes Disc brakes provide smooth, controlled stopping in all conditions with minimal maintenance. Tire Clearance The Nicasio frame and fork has clearance for up to 700c x 35mm or 650B x 47mm tires.

The Donky Jr is ready to tear up the local sidewalks, driveways, and bike paths. Built around a lightweight aluminum frame, and equipped with smooth-rolling, mixed-tread tires and powerful linear pull brakes, these models are great for the new rider. Hand-operated brakes and freewheels help make the transition to their next bikes even easier.

Marin Fairfax ST 1, built for the flat-bar road/fitness/hybrid rider. Named "Best Hybrid" by Wirecutter, built around a lightweight Series 1 aluminum step through frame, stout chromoly fork, and a dependable and reliable Shimano drivetrain.

The Lombard 2 features a Series 3 aluminum frame and carbon fork with thru-axles, making it perfect for gravel adventures or as an urban assault bike. The Lombard was designed with clearance for up to 700x45c tires for comfort and control across a wide variety of surfaces. All Lombard frames feature internal cable routing for a clean look. Additional features include full rack and fender mounts along with reflective decals help to maximize low-light visibility for commuting or just getting in those extra miles. - Series 3 Beyond Road, 6061 Aluminum frame - Marin Full Carbon fork - Shimano Tiagra 10-Speed drivetrain - Shimano Tiagra BR-RS405 hydraulic disc brakes - Marin Aluminum Double Wall rims w/Vee Tire G-Sport 700x40c tires

Born from the same ethos as the Gestalt series, the Nicasio is designed to take you Beyond Road. These endurance models let you take any path you’d like, whether it is on the asphalt or to a variety of off-road terrains. The Nicasio is for the rider looking for something different and modern, yet with traditional steel construction. Classic lines and CrMo frame tubes have the soul of a classic bike, while the 700 x 30mm-40mm or 650B x 47mm tires let riders handle any surface. - Double Butted CrMo steel frame and fork - Shimano Claris 2x8 drivetrain - Marin aluminum double wall rims on forged aluminum hubs - Promax Render R Road mechanical disc brakes

Modern XC races look like a fast day on the local singletrack, requiring a light and capable bike that can maintain speed and control on every part of the trail, up or down. The Team Marin blends the confidence and fun of a trail bike with a lightweight frame and parts that help you keep the speed up and the fun meter maxed. Series 4 Aluminum Frame The Team Marin features Series 4 aluminum frames, with advanced tube forming for minimal weight, 3D forged dropouts, flat-mount disc tabs, full internal cable routing, and a boost 148mm thru axle. Internal Dropper Post Routing The Team Marin frame includes internal routing in the front triangle for a clean, fast appearance, and allowing for Team Marin 1 owners to upgrade to an internal dropper post if they desire. Bridgeless Fastback Seatstays Slim fastback seatstays, without the bridge, give great tire clearance, as well as adding vertical compliance for long-ride comfort without sacrificing power transfer. 29" Wheels And 2.35" Tires For Maximum Speed 29" wheels and 2.35" XC tires ensure maximum grip and float over obstacles to maintain speed so you can pick up those personal records and keep ahead of the pack. - Superlight aluminum frame - RockShox Judy Silver TK 120mm fork - Shimano Deore 1x12 drivetrain - Shimano BR-MT201 hydraulic disc brakes

The Stinson brings a new level of comfort and control to your ride. This model has a lightweight Series 1 aluminum frame with low standover, an ergonomic handlebar, plush saddle, and versatile, high-volume 27.5" tires with mixed tread for control on a variety of surfaces. Design features include our Comfort Control Geometry with upright seating and the ability to touch the ground with the forefoot, while maintaining proper saddle height for pedaling efficiency. Series 1 Aluminum Frame The Stinson features a Series 1 6061 aluminum frame with exceptionally low standover, disc brake mounts, rack and fender eyelets, and high-volume 27.5" wheels. Comfort Control Geometry Marin Comfort Control geometry allows you to touch the ground with your forefoot when the saddle is at the correct height for full pedaling leg extension. 27.5" Tires Large volume 27.5 x 2.35" tires are capable and comfortable across a range of surfaces. Wide-Range Gearing Wide-range, 1x gearing is simple to use and offers as large if not larger of a gear range than multi-chainring bikes of the past. - Aluminum frame w/CrMo fork - Shimano Tourney/Altus 1x7 drivetrain - Power CX7 mechanical disc brakes - Marin Comfort touch points

The Four Corners is built for the adventure rider looking to explore deep off of the beaten path, sleep outdoors, and be ready for whatever pavement, dirt road, or light singletrack is around the next corner. The heads-up bar position and generous braze-ons that make it possible to live on the bike for days at a time are equally at home on the daily commute. Bottle/Gear Mounts Fork leg bottle or accessory cage mounts on the base Four Corners, along with traditional front triangle bottle mounts (three on sizes M-XL, two on XS-S) provide up to six bottle cage mounts total. Disc Brakes Disc brakes provide smooth, controlled stopping in all conditions with minimal maintenance Steel is Real The Four Corners uses butted and formed Series 1 4130 CrMo frames specially tuned for loaded touring with upright geometry for comfortable and efficient all-day rides.

The Rift Zone is our most speed-oriented MultiTrac bike, created for the rider looking for the speed and rollover capabilities of 29" wheels in a trail-capable package. Long, low, and slack trail geometry is more aggressive than an XC race bike for more control at top speed, and more fun while chasing seconds. SERIES 3 ALUMINUM FRAME The Rift Zone 3 model features a Series 3 aluminum frame with detailed forgings, highly manipulated tubes, and full internal cable routing, giving the rider the highest-end alloy frame that Marin offers. MULTITRAC SUSPENSION TECHNOLOGY MultiTrac is an acclaimed suspension system, fine-tuned to have a balanced ride capable of absorbing big hits with an efficient pedaling platform. The rocker link provides a progressive leverage ratio for the rear shock for small bump sensitivity and the feeling of a long-travel system on large drops and rocks. INTERNAL ROUTING All Rift Zone models sport full internal cable routing in the front triangle with Marin’s all-new internal cable routing grommets, providing a cleaner and rattle-free cable set up.

The DSX is a flat bar gravel bike with Series 3 aluminum frames and a carbon fork with large tire clearance. It offers low standover, hydraulic disc brakes, and a reliable 1x drivetrain, combining mountain bike sensibilities in a flat bar package capable of fast commutes, long Saturday adventures spanning pavement and light singletrack, and all-day gravel events. Series 3 Frame The DSX features a butted and formed Series 3 6061 aluminum frame with internal routing, 142x12mm thru-axles, flat mount disc brakes, and rack and fender eyelets. Tire Clearance The DSX comes stock with 700x45mm tires, with room for 29x2.1" knobbies. Disc Brakes The DSX features the latest flat mount disc brake standard for smooth, controlled stopping in all conditions with minimal maintenance. Dropper Post Routing Dropper posts are quickly becoming standard fare for gravel racers and riders that spend significant time on rough surfaces, and the DSX features internal dropper post routing for easy upgrades. - Series 3 aluminum frame - Full carbon fork - Shimano Deore 1x11 drivetrain - Tektro HD-R280 mechanical disc brakes

The Fairfax is key to our our Fitness line, built for the flat-bar fitness road rider with the accessory mounts and gear range for future upgrades. Key upgrades from Fairfax 1/1 ST: - Series 2 Fitness frame - Straight blade aluminum fork - Shimano Acera/TY710 2x8 drivetrain - Vee Tire Zilent tires w/puncture protection

CASUAL COMMUTER The Kentfield 2 is our top-tier Kentfield. Designed to be affordable, comfortable and reliable it’ll go the distance, every day of the week. Our Series 1 aluminum frame is lightweight and responsive, and comes decked out with plenty of rack and fender mounts to suit your setup. There’s a microSHIFT 10-Speed drivetrain, Vee Tire tires, Clark’s mechanical disc brakes and plenty of reliable Marin components. The Kentfield 2 is also available in a step-through version. SERIES 1 ALUMINUM FRAME - The Kentfield features a Series 1 6061 aluminum frame with disc brake mounts and rack and fender eyelets and fast rolling, multi-surface capable 700c wheels with either a standard horizontal top tube or a step-thru frame design. HYBRID GEOMETRY - The Kentfield features upright seated hybrid geometry that mixes the upright position of a mountain bike with the efficiency of a pavement bike. WIDE-RANGE GEARING - Wide-range, 1x gearing is simple to use and offers as large if not larger of a gear range than multi-chainring bikes of the past.

CASUAL COMMUTER The Kentfield ST2 is the step-through version of our top-tier Kentfield. Designed to be affordable, comfortable and reliable it’ll go the distance, every day of the week. Our Series 1 aluminum frame is lightweight and responsive, and comes decked out with plenty of rack and fender mounts to suit your setup. There’s a microSHIFT 10-Speed drivetrain, Vee Tire tires, Clark’s mechanical disc brakes and plenty of reliable Marin components. Why choose a step-through bicycle frame? Traditionally designed for female riders wearing skirts, the step-through has evolved to suit anyone that prefers a frame that’s far easier to swing a leg over. They’re ideal for less flexible riders, slow-speed urban cycling and riders that need to load their bike up with bags or kids. SERIES 1 ALUMINUM FRAME - The Kentfield features a Series 1 6061 aluminum frame with disc brake mounts and rack and fender eyelets and fast rolling, multi-surface capable 700c wheels with either a standard horizontal top tube or a step-thru frame design. CRMO BMX INSPIRED FORK - The stylish CrMo BMX style fork has straight blades, disc mounts, and BMX inspired dropouts. HYBRID GEOMETRY - The Kentfield features upright seated hybrid geometry that mixes the upright position of a mountain bike with the efficiency of a pavement bike. WIDE-RANGE GEARING - Wide-range, 1x gearing is simple to use and offers as large if not larger of a gear range than multi-chainring bikes of the past.

The Fairfax is key to our our Fitness line, built for the flat-bar fitness road rider with the accessory mounts and gear range for future upgrades. Key upgrades from Fairfax 1/ST 1: - Series 2 Fitness frame - Straight blade aluminum fork - Shimano Acera/TY710 2x8 drivetrain - Vee Tire Zilent tires w/puncture protection

Marin Fairfax ST 1, built for the flat-bar road/fitness/hybrid rider. The step-through version of the bike named "Best Hybrid" by Wirecutter, built around a lightweight Series 1 aluminum step through frame, stout chromoly fork, and a dependable and reliable Shimano drivetrain.

The Stinson brings a new level of comfort and control to your ride. This model has a lightweight Series 1 aluminum frame with low standover, an ergonomic handlebar, plush saddle, and versatile, high-volume 27.5" tires with mixed tread for control on a variety of surfaces. Design features include our Comfort Control Geometry with upright seating and the ability to touch the ground with the forefoot, while maintaining proper saddle height for pedaling efficiency. SERIES 1 ALUMINUM FRAME The Stinson features a Series 1 6061 aluminum frame with exceptionally low standover, disc brake mounts, and rack and fender eyelets and high-volume 27.5” wheels. Stinson ST models further lower the standover height with a step-through frame design. COMFORT CONTROL GEOMETRY Marin Comfort Control geometry allows you to touch the ground with your forefoot when the saddle is at the correct height for full pedaling leg extension. COMFORT SADDLE All Stinson models utilize our comfort saddle, which is wide and supportive, but not *too* squishy. The perfect balance of comfort and efficiency. WIDE-RANGE GEARING Wide-range, 1x gearing is simple to use and offers as large if not larger of a gear range than multi-chainring bikes of the past. DISC BRAKES Disc brakes provide sure stopping power in all conditions, while being powerful and easy to modulate. 27.5” TIRES Large volume 27.5” x 2.35” tires are capable and comfortable across a range of surfaces.

CASUAL COMMUTER The Kentfield 1 is our most-affordable Kentfield. Designed to be affordable, comfortable and reliable it’ll go the distance, every day of the week. Our Series 1 aluminum frame is lightweight and responsive, and comes decked out with plenty of rack and fender mounts to suit your setup. There’s a Shimano 7-speed drivetrain, Vee Tire tires, Clark’s mechanical disc brakes and plenty of reliable Marin components. The Kentfield 1 is also available in a step-through version. SERIES 1 ALUMINUM FRAME - The Kentfield features a Series 1 6061 aluminum frame with disc brake mounts and rack and fender eyelets and fast rolling, multi-surface capable 700c wheels with either a standard horizontal top tube or a step-thru frame design. CRMO BMX INSPIRED FORK - The stylish CrMo BMX style fork has straight blades, disc mounts, and BMX inspired dropouts. HYBRID GEOMETRY - The Kentfield features upright seated hybrid geometry that mixes the upright position of a mountain bike with the efficiency of a pavement bike. WIDE-RANGE GEARING - Wide-range, 1x gearing is simple to use and offers as large if not larger of a gear range than multi-chainring bikes of the past.

URBAN WARRIOR The Marin Larkspur has all the looks of an old-school step-through but with chunky tanwall tires, wide rims, powerful disk brakes and the option of a dropper seat post. Beneath those old-school looks is a super modern and Marin Bikes-made steel frame and plenty of today’s standards to keep it right up to date. Why just roll to the deli or ride to work when you can take a detour down your favourite dirt track on the way? It's an adventure bike, it's a gravel bike, it's a mountain bike, it's a commuter bike... it's whatever you want it to be. The Marin Larkspur 1 is built around a Series 2 butted CrMo step-through frame, a curved CrMo fork and 27.5” wheels. It has high volume 2.35” Vee Tire Co tires, a microSHIFT 10-speed drivetrain, Tektro hydraulic brakes and plenty of reliable Marin components to complete the package. STEEL FRAME - Larkspur models feature butted Series 2 frames with a mixte step thru design for easy mounting and dismounting, even with baskets and baby seats. WIDE-RANGE 1X DRIVETRAINS - Both Larkspur models are built around modern, wide-range drivetrains, 10-speed on the Larkspur 1 and 11-speed on the Larkspur 2. These drivetrains are stout and have all the gearing most anyone could use, without relying on sometimes-fussy front derailleurs. Clutch-type rear derailleurs and narrow-wide front chainrings keep the chain on track, all the time. DISC BRAKES - Hydraulic disc brakes provide smooth, controlled stopping in all conditions with minimal maintenance.

The Gestalt X is made to expand your horizons even further beyond roads. We extended the possibilities of the Gestalt by adding generous tire clearance, lowering the stand over, using solely one-by drivetrains, adding dropper post routing, and tuning the geometry for more adventurous riding. This is the dropbar bike for the rider looking for singletrack no matter what the occasion; the perfect bike to ride the road both to and from the trail and cut through unexplored places to find new routes. Series 3 Frame The Gestalt X features a butted and formed Series 3 6061 aluminum frame with internal routing, 142x12mm thru-axles, flat mount disc brakes, and rack and fender eyelets. Beyond Road Geometry The Gestalt X takes our Beyond Road Geometry to the next level of aggressive road and dirt exploration with a blend of endurance road handling and mountain bike sensibilities. Disc Brakes The Gestalt X features the latest flat mount disc brake standard for smooth, controlled stopping in all conditions with minimal maintenance. Tire Clearance The Gestalt X frame and fork have clearance for up to up to 700c x 45 or 650B x 47 Road Plus tires. - Series 3 aluminum frame - Full carbon fork - Shimano GRX 1x11 drivetrain - Shimano GRX hydraulic disc brakes - TranzX YSP38J dropper seatpost