Seatposts

• Aluminum • Coil spring provides plush suspension • Adjustable pre-load design • Micro-adjust seat clamp • 450 grams

Choose from the many colors and add style to your ride with Origin-8's Compe-Lite Seat Post. It's crafted from light and durable 6000 aluminum, and features a single-bolt adjustable clamp for easy seat installation and fine-tuning.

Dimension Suspension Seatpost - Clamp Style: Std Rails - Diameter: 27.2mm - Length: 350mm - Material: Aluminum - Max Height: 255mm - Min Height: 130mm - Offset (mm): 0mm - Seatpost Type: Suspension - Travel (mm): 35mm - Weight: 450g

The latest generation Thudbuster ST is superior to its predecessor in every way. Building on Thudbuster's proven parallel linkage technology we have completely re-designed the seatpost for increased durability, a higher rider weight limit, and additional suspension travel, as well as ease of use through tool-free elastomer change and a single-bolt seat clamp design. By improving on this already legendary design, we're confident to say that the newest generation Thudbuster is the most advanced suspension seatpost ever made. - Travel: 50mm - Weight: 580g - Max Rider Weight: 330lbs

Sleek design and ultimate functionality of the WCS 1-Bolt seatpost are the hallmarks of Ritchey design. Single bolt-actuated side load clamp offers easy adjustability and simple security in a post that works as nicely as it looks. - 3D Forged 7050 Alloy - Available in 27.2, 30.9 and 31.6mm diameters - Available in 350 and 400mm lengths - 20mm Offset - 7x7mm saddle rail clamp included - Interchangeable clamps available for carbon rail saddles - Saddle Clamp Torque Spec: 12Nm - Finish: Blatte - 195g (27.2/350)

The Reverb Stealth features Vent Valve Technology for super simple service if the need arises. Redesigned internals provide effortless actuation and increased reliability. With reduced overall post lengths and new travel options, riders of all shapes and sizes benefit from more travel than ever before. The new Reverb Stealth redefines what it means to simply go up and down. - Shorter overall post length - Stealth Internal cable routing

3D forged one-piece AL6061-T6 construction - Wide saddle clamp design reduces rail stress and flex - Micro-adjust 2 bolt clamp design - 15mm setback - ISO-Mountain safety certified

Odyssey is proud to offer their new tripod post. It allows for the two most popular seat angles amongst riders and it’s clean, light and easy to install. SPECS - 25.4mm diameter - 6061-T6 Aluminium, CNC machined

Our intention with Reverb AXS was inventive and pure: No hoses. No routing. No energy wasted. Not a single thing in the way of the experience. We created a reliable wireless-electronic dropper post and controller that actuates with drastically less effort and zero distraction. Expanding what's possible on a bike, Reverb AXS is enabled by SRAM AXS technology, a new level of interaction, personalization, and connectivity across all AXS-enabled components. - Effortless Electronic-Wireless actuation and infinite height adjustment with a single touch. - Clean, simple and fast to install. No hoses to route, no fishing required. - Updated internals for faster return speed in all conditions. - New Vent Valve Technology, a simple and reliable built in service solution without disassembly of the seatpost. - SRAM AXS technology, a new level of interaction, personalization, and connectivity across all AXS-enabled components. - Includes RockShox AXS handlebar controller, rechargeable SRAM battery, and charger.

The all-new Highline delivers infinite adjustment, smooth feel, and easy installation for any bike. Details - Shorter insertion length to fit more bikes - Premium Trelleborg sealing - Exclusive Igus LL-glide bearings and keys - Jagwire cable and housing - Self-contained IFP hydraulic cartridge - Internal routing - Quick connect mechanism for ease of cable installation - Linear actuator for quick return speed - 2-bolt quick-connect head - Remote sold separately

The redesigned Zero post offers no-slip saddle engagement and high adjustability by securing the rails with fore and aft bolts. Whether you're hitting rough singletrack or remounting in a hurry, this ensures the saddle stays exactly where you want it. - Material: 2014 alloy - Total length: 400mm (including 100mm of minimum insert) - Saddle clamp: 2-bolt fore/aft - Saddle clamp torque: 7Nm (max) - Seat collar torque: not specified - follow frame/seat binder specification - Weight: 240g (27.2x400mm)

Proven 2-bolt design provides a class-leading balance between strength, weight, and easy adjustability. Low-profile clamp reduces stress on lightweight rails and won't bottom out. - Material: 6061 alloy - Saddle clamp: standard - Saddle clamp torque: 13Nm (max) - Seat collar torque: not specified - follow frame/seat binder specification

Carbon seatpost with a proven low-profile, 2-bolt clamp that won't bottom out on the saddle. - Low-profile clamp reduces stress on lightweight rails - 2-bolt design securely holds the saddle in place and is easy to adjust - Offset: 25mm - Clamp Style: Standard Rails - Material: Carbon

- Length: 400mm - Offset: 0mm - Clamp Style: Standard Rails - Material: Aluminum

ENVE's proven twin-bolt seatpost design refined for the modern road bike with seatpost battery integration capabilities. - Material: Carbon Fiber - Hardware Material: Titanium - Saddle Angle Adjustment: 0 – 27 degrees - Saddle Rail Compatibility: 7x10mm Carbon Rails / 7mm Round Alloy Rails - Torque Spec, Saddle Rail Clamp Bolts: 5.5Nm - Torque Spec, Seatpost Collar: Determined by your Frame manufacturer/Seatpost Collar - Weight: 210g (25.4mm), 204g (27.2mm), 204g (30.9mm), 204g (31.6mm)

- RaceFace Ride XC Seatposts made of forged AL-6061 - Forged, anodized and shot peened AL-6061 mast - 2-bolt head holds saddle securely while retaining easy adjustability - Weight: 295 g

Such Great Heights The budget-friendly Aeffect R Dropper Post is a rock-solid, shred-ready entry into the dropper post world. Designed right to keep you on the trails and out of the shop as much as possible, you'll wonder how you ever rode without one. It's What's Inside That Counts The brains of this dropper post are an extremely reliable cable-actuated hydraulic cartridge that delivers infinite adjustment within its travel. Simple Saddle Setup A user-friendly zero-offset seatpost clamp really cuts down on the time between setting up your saddle and ripping down the trail.

Kalloy's 602 seatpost comes in a wide variety of diameters to fit most frames. Simple, sturdy, and lightweight, the 602 makes a great replacement seatpost.

- UD carbon shaft bonded to an AL6061-T6 alloy top clamp - Wide saddle clamp design reduces rail stress and flex - Micro-adjust 2 bolt clamp design - ISO-Mountain safety certified

Thomson Covert Elite Dropper Seatpost-31.6 150mm Black Internal. We've set the bar with the Thomson covert black dropper post. It's designed around internal routing for clean installation and an updated shift style remote lever for effortless operation. The Thomson Covert Dropper includes a new shifter oriented remote lever for easy operation. The cartridge-based system is designed to have the longest service life in the industry. If repair is needed, it's fast, affordable, and simple. Every part that makes up the Covert dropper is carefully chosen, and of the highest grade quality available. - Custom made Norglide bearing bushings and Trelleborg O-Rings and seals - Thomson saddle clamps and fasteners - Motul Oil for durability and precision quality. - The return speed is damped in the last 15mm of upward travel to be gentle on your seating area. - 60mm (Ø27.2 only), 100mm, 125mm, 150mm of infinite travel. - Passes ISO 4210 fatigue and strength tests for seat posts.

Full UD carbon shaft with alloy clamp - Wide saddle clamp design reduces rail stress and flex - Micro-adjust 2 bolt clamp design - Available in 0mm and 15mm setback options - ISO-Mountain safety certified

- Forged aluminum - 7/8-inch seat-clamp diameter - 165 grams

The proven Transfer seatpost gets lighter and tighter. Completely redesigned from the ground up, with improved serviceability, decreased weight, reduced length, and decreased insertion depth. Performance Elite Transfer Posts retain the same internals, diameter options, drop options, shortened stack heights, new patent-pending head design and proven internals as the Factory Series but have a black anodized upper. - Cable actuated with tool-free quick disconnect for easier installation and removal - Low lever force provides consistent actuation pressure even with saddle weighted or unweighted - Easy to modulate return speed with lever - Remote lever sold separately - 0mm offset

The proven Transfer seatpost gets lighter and tighter. Completely redesigned from the ground up, with improved serviceability, decreased weight, reduced length, and decreased insertion depth. "Factory" says it all. The best-of-the-best technology we have to offer is available in our Factory Series models with our buttery smooth, ultra-durable Genuine Kashima Coat. These products are World Cup proven. The Transfer continues the excellent reputation of smooth function and great reliability with an infinitely adjustable height design, and internal or external cable routing options. Low lever force and great modulation make it easy to regulate return speed and small height adjustments. The Factory Series Transfer features Genuine Kashima Coating for maximum performance. - Cable actuated with tool-free quick disconnect for easier installation and removal - Low lever force provides consistent actuation pressure even with saddle weighted or unweighted - Easy to modulate return speed with lever - Factory Series models feature Genuine Kashima Coat - Remote lever sold separately

The Highline 3 delivers infinite adjustment, smooth feel, and easy installation. Details - Premium Trelleborg sealing - Exclusive Igus LL-glide bearings and keys - Jagwire cable and housing - Self-contained hydraulic cartridge delivers industry-leading quality and reliability - Internal routing - Quick connect mechanism for ease of cable installation - Linear actuator for quick return speed - 2-bolt standard head - Remote sold separately

Bike fit is important - a bike should feel like an extension of the body, especially when dialed in. Getting just the right saddle position is second-to-none when putting out power over long miles is concerned. Ritchey Link posts offer two clamp positions for greater adjustability in dialing in the right fit. - 7050 Alloy 2pc Press Fit Head - 15mm adjustable setback - Reversible clamp for greater fore/aft adjustability - Finish: BB black

• Steel • Polished-chrome finish • 7/8-inch seat-clamp diameter

• Unicycle-specific seatpost

The new Reverb AXS XPLR dropper post delivers more control, confidence, and fun on gravel roads everywhere. Getting the saddle out of the way means more room to move, saving you from awkward maneuvering and sketchy descents. We created an all-new design complete with lightweight air-only internals featuring built-in compliance we call ActiveRide. It's like travel for your saddle. Enabled by SRAM AXS technology, Reverb AXS XPLR is part of the ultimate personalized cockpit. - New 27.2mm Reverb AXS XPLR delivers more control, confidence, and fun for gravel - ActiveRide—Air only internals provide a fully rigid top-out position. With the touch of your AXS controller, you've got built-in compliance to ensure comfort and control over the roughest sections of gravel - Two travel options to choose—50mm or 75mm - Saddle clamp options compatible with 7x10 oval carbon rails. - Seat post length includes 400mm and 350mm (50mm drop only) - AXS Technology allows rider customization via the AXS Mobile App - AXS handlebar controls (drop or flat bar) - Shared battery with all other SRAM AXS enabled components - System is completely waterproof and dustproof to IP69K—take it anywhere - SRAM AXS battery and charger included SPECIFICATIONS: - TRAVEL: 50mm, 75mm - POST DIAMETER: 27.2mm - POST LENGTH: 350mm, 400mm - REMOTE: AXS Controller Sold Separately - SADDLE RAIL COMPATIBILITY: Round/Oval (7x9 & 7x10), Round/Oval (7x9) - WEIGHT (G): 562 - WEIGHT BASED ON: 75mm Travel 400mm Length W/O battery - Battery 25g

The newly redesigned EC70 Seatpost takes our superlight unidirectional carbon and applies our patent pending ISA technology - Independent Saddle Adjustment - which allows for completely independent fore-aft adjustment and saddle adjustment. With the 2 pitch adjustment bolts, the saddle angle gets locked into place as if you were adjusting limit screws, and unlike single bolt designs, you get adjustability and security. Available in 20mm Setback and Zero configurations. - Finish: Matte Black UD Carbon/Matte Black Head - Weight: Zero offset, 210g; Setback offset, 223g - Head offset: 0mm; 20mm - Length: 350mm w/ 80mm min. insert - Quill size: 27.2mm - Rail clamps: 7mm round; 7mm x 9mm oval (both included) - Material: EC70 carbon

Origin-8's Pro Fit Alloy Seat Post is made of light and durable forged aluminum that's been anodized and laser etched for a custom look. It also features an adjustable 2-bolt clamp that holds fast and lets you easily dial in your seat position. And, this fine post comes in a variety of diameters to fit almost any bike.

The Salsa Guide Carbon Seatpost is lightweight, durable, and supportive when you need it most. - Carbon shaft - Bonded Aluminum two-bolt head

The Salsa Guide Deluxe Seatpost is premium aluminum: lightweight, strong, and drama-free. Count on it to be there when you need it. - 2014 Aluminum shaft - Two-bolt head

The Salsa Guide Seatpost is designed to blend into the background; just like a good seatpost should. Strong, reliable, and always just where you left it. - 6061 Aluminum shaft - Two-bolt head

The X-Fusion Manic post uses internal cable routing and was designed around a low-profile seat cradle and seal collar to fit a broad range of frames. The mechanism is air-sprung and hydraulically locked. The remote can be run on the left or right, above or below the handlebar, but is optimized as a left shifter replacement for 1x drivetrains. - Cable activated, hydraulic action, infinitely adjustable travel - Double key-way design prevents lateral twisting - Double bolt clamp with a wide range of seat angle adjustment. Fits both standard and 7 x 9 mm Carbon Rails - Sealed cartridge internals for quick replacement - Low profile head-seal and saddle clamp increase useable travel

Whether it's a cross remount, an unexpected pothole, or a rough line down the trail, the WCS Zero post will not relinquish its position. Featuring a confidence-inspiring extra-secure fore/aft bolt system, the Zero post is second-to-none in ease of installation and fit adjustment. - Fore/aft adjustment bolts for precision adjustment and secure clamping - 3D Forged 2014 Alloy - Offset: Zero - Cradle: Standard saddle rail clamp

3D forged one-piece AL7050-T6 construction - Wide saddle clamp design reduces rail stress and flex - Micro-adjust 2 bolt clamp design - 15mm setback - ISO-Mountain safety certified

Saddle Up Based on the latest FOX Transfer platform with its proven performance, the new Turbine R Dropper Post features a slick seat clamp design for reduced stack height and a 25g weight savings from the previous version. This post will treat you right. Less is More New, patent-pending FOX seat clamp design dramatically reduces stack height, allowing you to fit more travel into a shorter space. Full Coverage Proven FOX-designed internals provide infinite height adjustment, but perhaps more importantly—even easier serviceability. No-Sweat Installation Mounting a saddle and getting your saddle position dialed is easy thanks to the user-friendly seatpost clamp. Brilliantly Uncomplicated Uses standard shifter cable and housing. You know, just to keep things real. Oh yeah—it's also 25g lighter than the previous version. - Compatible with Matchmaker - Includes post only - Mechanical lever actuation - Head Type: Zero Offset—2 Bolt - Weight: 520g

The EA70 Zero is Easton’s top-end aluminum seatpost, with a sleek, low-profile clamp design, impressive stability and great clearance. This post features EA70 TaperWall aluminum tubing coupled with a durable two-bolt integrated head.

On today's road bikes, silver stands out amid the sea of stealthy black color schemes. This time-honored seatpost color is available on the Zipp Service Course Seatpost. Since the introduction of our line of Service Course and Service Course SL components, we've had amazing success with our pro-level athletes in all disciplines. While the successes have reinforced our design decisions, we have also drawn from their feedback. We not only learned how and why athletes make their equipment choices, but how our manufacturing methods and materials affect product performance. With new knowledge as well as new engineering, we are proud to offer redesigned Service Course seatposts. - Material: 6061 aluminum - 2-bolt adjustability - Minimum insertion length: 90mm

The patented Dual-Position Seatpost lets you ride a true aero position on a standard road bike, without sacrificing your normal road position. Along with the Quick-Release Aerobars it provides the benefits of a triathlon or time trial bike without the additional bike or price tag. The key to riding powerfully and comfortably is proper saddle position and since you can switch between road and aero positions on-the-fly while riding, you can always choose the best riding position for every part of your ride. Benefits: - Transform your current bike—switch from road to aero position on the bike you already own - Ride with ease—no more time and energy wasted switching from road bike to aero bike Details: - Linkage design lets you switch between road and aero positions seamlessly while riding - Choose the best position for every single climb, flat, or descent - Maintain proper leg extension in both road and aero positions - Saddle moves forward 50mm, corresponding to approximately 4 degrees of effective seat tube angle change - Aero road riding position optimized for proper handling on a road bike - Simple, durable two-bolt saddle clamp allows infinite saddle tilt adjustment and reliable clamping - 16mm rearward setback (road position) - Check technical specifications for compatibility

Seatposts can be an overlooked part of the bike, but at Whisky Parts Co., everything gets the same attention to detail so your ride never suffers. Their seatposts are made from the highest quality carbon, ensuring they are durable, lightweight, and comfortable. Whether you’re remounting during a cross race or abusing them on the trail, you'll be glad you have the No.7. - Carbon shaft absorbs trail chatter - UD carbon shaft, forged aluminum head

Built without compromise, the Highline 11 combines premium materials with our tried-and-trusted hydraulic IFP cartridge system, resulting in our lightest dropper post yet. Featuring a carbon quill, carbon head, and titanium hardware, the Highline 11 sheds up to 100 grams over our Highline 7, all without compromising on any features or construction. The post maintains all of your favorite elements such as infinite adjustment and a reliable hydraulic IFP. Built with every rider in mind, from cross country racer to weekend enduro rider the Highline 11 is available in travel lengths ranging from 60mm to 170mm allowing the rider to choose the perfect post for them.

This replacement seatpost for the Tarmac SL8 ensures the perfect fit with two different setback options—0mm and 20mm. - FACT carbon construction and aerodynamic profile compatible with the 2024 Tarmac SL8. - Setback: 0/20mm. - 20mm offset: 2-bolt micro-adjust clamp with 46mm saddle rail cradle enables an effective offset from 0mm to 20mm. - 0mm offset: Cylindrical aluminum head assembly adjusts fore-aft and tilt with an easy-access single bolt.

This is the first seatpost that’s compliant AND aerodynamic—a total win, win. We initially developed the Pavé seatpost for the all-new Roubaix, and it’ll make a fantastic addition to your Tarmac SL6. Of course, it’s also designed to make fine-tuning your saddle position a breeze with a single-bolt adjustable head and two setback options. - FACT carbon construction paired with a D-shaped seatpost that's compatible with the 2020 Roubaix and Taramc SL6. - Engineered to have the saddle move in a perfect arc, aka a back & downward motion. - Setback: 20mm/0mm - Cylindrical aluminum head assembly adjusts fore/aft and tilt with a single bolt. - Length: 380mm/450mm - Approximate Weight: 209g

This replacement seatpost for the Tarmac SL7 ensures the perfect fit with two different setback options: 0mm and 20mm. - FACT carbon construction and aerodynamic profile compatible with the 2021 Tarmac SL7. - Setback: 0/20mm. - Sleek Di2 integration hides the Di2 junction box inside. - Cylindrical aluminum head assembly adjusts fore-aft and tilt with an easy-access single bolt.

The latest generation Thudbuster LT is superior to its predecessor in every way.  Building on Thudbuster's proven parallel linkage technology we have completely re-designed the seatpost for increased durability, additional suspension travel, as well as ease of use through tool-free elastomer change and a single-bolt seat clamp design. By improving on this already legendary design, we're confident to say that the newest generation Thudbuster is the most advanced suspension seatpost ever made. - Travel: 90mm - Weight: 750g (31.6mm) - Max Rider Weight: 250lbs

• Forged aluminum • Integrated micro-adjust seat clamp

Dimension Two-Bolt Seatposts provide a sturdy and durable saddle perch for cross country and all-mountain riding in three diameters, rigorously tested to ISO 4210 Mountain standards. - Constructed with AL-6061-T6 aluminum - Shot-peened finish - 0mm offset

The Reverb Stealth features Vent Valve Technology for super simple service if the need arises. Redesigned internals provide effortless actuation and increased reliability. With reduced overall post lengths and new travel options, riders of all shapes and sizes benefit from more travel than ever before. The new Reverb Stealth redefines what it means to simply go up and down. - Shorter overall post length - Stealth Internal cable routing

FSA's Metropolis seatpost is CNC machined from AL6069 aluminum and features a forged alloy single-bolt head with chromoly hardware. Simple and elegant, this seatpost gets the job done weighing a scant 257 grams.

Ride longer, ride farther with the eeSilk premium suspension seatpost. The eeSilk is comparable in weight to traditional rigid performance seatposts while offering 20mm of vertical compliance improving control on rough surfaces and reducing fatigue on long rides. These posts make great enhancements to endurance road bikes by reducing the chatter transmitted from the surface to the rider and can be tuned to rider weight through a simple elastomer change. #5 elastomer comes pre-installed, other weight elastomers sold separately. - Travel: 20mm - Length: 375mm - Weight: 345g (eeSilk 27.2) - Max Rider Weight: 250 lbs. - Offset: 8mm

Finding your rhythm can make or break your race. Our Control SL seat post puts you in an ideal position for high-output efforts and is easily adjusted thanks to the 2-bolt system letting you easily make micro-alignments for that dialed attack position—all while remaining feather light at 180g for XC riding and racing. Its 30.9mm post diameter and 415mm length make the Control SL seat post a perfect match for the modern XC bike. Once your riding position is set, you’re focus is dialed on ride fast and efficiently —not your seat post. - Material: High-modulus carbon fiber - Length: 415mm - Offset: 0mm - Post Diameter: 30.9mm - Seat Clamp: 2-bolt Micro Adjust with 46mm saddle rail cradle, Compatible with carbon and alloy saddle rails - Bolts: Titanium - Weight: 180g - System Weight Limit: 275lbs / 125kg

Performance suspension seatposts designed to add comfort and compliance to any bike without adding unnecessary weight. With 35mm of travel, the eeSilk+ is a suspension seatpost designed to noticeably soften any gravel or mixed-surface road. These posts make great enhancements to gravel or mixed surface bikes by reducing the chatter transmitted from the surface to the rider and can be tuned to rider weight through a simple elastomer change. #5 elastomer comes pre-installed, other weight elastomers sold separately - Travel: 35mm - Length: 362mm - Weight: 323g (27.2mm), 333g (31.6mm) - Max Rider Weight: 250lbs - Offset: 12mm - Minimum Extension: 80mm - Maximum Extension: 287mm

- Designed using SRAM Exogram technology - Available the Zipp SL Speed DI2 Internal Battery Mount to hold a Shimano DI2 seatpost battery within the SL Speed seatpost. (Sold separately) - Matte Black finish

ENVE's proven twin-bolt seatpost design refined for the modern road bike with seatpost battery integration capabilities. - Material: Carbon Fiber - Hardware Material: Titanium - Saddle Angle Adjustment: 0 – 27 degrees - Saddle Rail Compatibility: 7x10mm Carbon Rails / 7mm Round Alloy Rails - Torque Spec, Saddle Rail Clamp Bolts: 5.5Nm - Torque Spec, Seatpost Collar: Determined by your Frame manufacture/Seatpost Collar - Weight: 178g (25.4mm, 25mm offset), 168g (27.2mm, 0mm offset), 178g (27.2mm, 25mm offset)

The Wolf Tooth Resolve Dropper Post is the first dropper post to use a self-bleeding cartridge. It has the shortest stack height of any dropper post on the market, has a short insertion depth, is one of the lightest dropper posts, and is completely serviceable at home. - Self-Bleeding Resolve Cartridge: At the heart of Resolve Dropper Post is a self-bleeding cartridge that removes air from the fluid chamber with every actuation. All dropper posts can get air in the chamber, which leads to sag and squish. Resolve Dropper Post is the only dropper post that purges air from the chamber, which means you'll never need to buy a new cartridge as you do with all other dropper posts. - Shortest Stack Height: The shortest stack height of any dropper post means that Resolve can get your saddle lower than any other dropper post. The lower your saddle, the more room you have to maneuver your bike on drops and techy descents. - Weight and weight per travel is equal to the best: Resolve Dropper Post is one of the most lightweight dropper posts on the market when it comes to grams per millimeter of travel. It's as much as 26% lighter than other dropper posts of the same travel size. - Short Insertion Length: When a dropper post has a short insertion length, longer travel options are unlocked for more bikes. A short insertion length is vital for smaller bikes, frames with curved seat tubes, and frames with seat tubes that have bottle bosses. - Travel Reduction with Spacers: The travel length of your Resolve dropper post can be customized in order to suit your bike and saddle height. Spacer kits are sold separately or those who would like to have the adjustment made later by their local shop mechanic. If you are comfortable with working on suspension components, you may be able to complete the installation yourself.

- Chromoly construction - Classic BMX Lay-back design - Material: Cro-Mo

- Chromoly construction - Classic BMX design - Material: Cro-Mo - Setback: 0mm

- Designed using SRAM Exogram technology - Available the Zipp SL Speed DI2 Internal Battery Mount to hold a Shimano DI2 seatpost battery within the SL Speed seatpost. (Sold separately) - Matte Black finish - Seat Post Diameter: 31.6mm - Seat Post Length: 400mm