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Top 10July 2025

Best Mountain Bike Seatpost 30.9

We made a list of the top 10 Mountain Bike Seatpost 30.9 based on verified reviews, popularity and other factors which we summarized for you in this list.

Best Choice

FIFTY-FIFTY Mountain Bike Seat Post, 27.2/30.9/31.6mm Aluminum Alloy Bicycle Seat Post, 350mm Length for MTB, Road Bike, E-MTB (27.2mm)

FIFTY-FIFTY Mountain Bike Seat Post, 27.2/30.9/31.6mm Aluminum Alloy Bicycle Seat Post, 350mm Length for MTB, Road Bike, E-MTB (27.2mm)

✓Strong and Durable: The bike seat post is made of 6061 aluminum alloy and CNC full machined
✓One Piece Forge and Lightweight: The bike seatpost is one piece forge so it is only 330g(27.2mm)/315g(30.9mm)/345g (31.6mm)
✓Two-Bolt Design: Two-bolt design for easy adjustment the tilt angle of the saddle with the clip to make the saddle reach the best riding comfort and keep the saddle in its position
✓Adjustable Seatpost Height: Our MTB seatpost is engraved with clear height marks, easy to adjust the height of the seat post bike to reach the right height for you
✓Diameter: 27.2mm/30.9mm/31.6mm, Total length: 350mm (Adjustable height), Zero offset

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18% Discount

Bynccea Bike Seat Post 27.2mm 30.9mm 31.6mm Bicycle SeatPost 400mm for Mountain Bike Road Bikes MTB BMX

Bynccea Bike Seat Post 27.2mm 30.9mm 31.6mm Bicycle SeatPost 400mm for Mountain Bike Road Bikes MTB BMX

✓Mountain Bike Seatpost Size: 27.2mm/30.9mm/31.6mm,Total length: 400mm.
✓Pay Attention to Choose Correct Diameter Size:Take out your current seatpost, the diameter marked on it’s lower area. Then buy same size from the option.
✓Material:Forged aluminum alloy 6061 T6.
✓Bynccea MTB seatpost with adjustable head,convenient to install.
✓【12-MONTH WARRANTY】:Quality guarantee.If you’re not 100% satisfied with your bike seatposts, simply send us a message and we’ll take care of you.

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PLATTBK Bike Seat Post 25.4/27.2/28.6/30.9/31.6 350mm Aluminum Alloy Road Bike MTB Seatpost,30.9mm

PLATTBK Bike Seat Post 25.4/27.2/28.6/30.9/31.6 350mm Aluminum Alloy Road Bike MTB Seatpost,30.9mm

✓【PAY ATTENTION】Please measure and confirm the exact post diameter required for your bike.
✓【MATERIAL】 Made of 6061 aluminum alloy, Lightweight strong and durable.Comes anodized in Black,Colorfast Surface,Great Anti-corrosion
✓【SIZE】Diameter: 25.4/27.2/28.6/30.9/31.6mm; Length:350mm;
✓【SAFE LINE MARK】There is a safety line mark on the seatpost. Please insert at least above the minimum safety line when installing the new seatpost.
✓【USE&FIT】Widely use in most road bicycles, fixed gear bicycles, mountain bikes, downhill bicycles, rail bikes, MTB, etc.

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11% Discount

Boenoea Bike Seatpost, Bicycle Seat Post 25.4 27.2 28.6 30.4 30.9 31.6 400mm Length Aluminum Alloy Bicycle Seat Tube for Mountain Bike and Road Bike, MBX

Boenoea Bike Seatpost, Bicycle Seat Post 25.4 27.2 28.6 30.4 30.9 31.6 400mm Length Aluminum Alloy Bicycle Seat Tube for Mountain Bike and Road Bike, MBX

✓Warm Tips: Please measure and confirm the exact post diameter required before purchasing. The saddle clamp is not included, please buy it if needed
✓Size: Length: 400 mm; Diameter: 27.2mm; Color: Black
✓Material: Boenoea seatpost is made of lightweight aluminum alloy, and the internal design is sturdy and durable, improving the load-bearing
✓Easy to Install: Just unbolt the old seat and remove the seat tube, then secure the seat bolt to the new one and attach it to the frame. Please insert at least above the minimum safety line
✓Widely Universal: Boenoea Seat Post is widely suited for most road bikes, mountain bikes, fixed gear bikes, BMX, etc

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Cogster Alloy Bike Seatpost Reducer Shim, 100mm Length Aluminum Bicycle Reducing Sleeve Seat Post Tube Adapter for MTB,Mountain,City Bike,Road Bike, Adapting 27.2mm seatposts to 30.9mm seat Tubes

Cogster Alloy Bike Seatpost Reducer Shim, 100mm Length Aluminum Bicycle Reducing Sleeve Seat Post Tube Adapter for MTB,Mountain,City Bike,Road Bike, Adapting 27.2mm seatposts to 30.9mm seat Tubes

✓Cogster Bike Seatpost Adapter Shim serves as a crucial part that adapts smaller seatposts to larger tubes, ensuring a proper fit.
✓Comes in various sizes to accommodate different bicycle seatpost diameters and seat tube diameters.
✓CNC'd from 6061 aerospace alloy, this bike seatpost shim balances superior strength, light weight, and corrosion resistance for long-term use.
✓Featuring tool-free installation, this bicycle seat post tube adapter is designed to avoid damage to the bike frame or seatpost, ensuring ease and safety.
✓By enabling the use of a different size seatpost, you can adjust the height or tilt of your saddle more accurately, thus improving your overall cycling comfort and performance.

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X AUTOHAUX 27.2x300mm Bike Seat Post Aluminum Alloy Bicycle Seatpost Mountain Bike Saddle Pole Road Bike Seat Tube Mount Black

X AUTOHAUX 27.2x300mm Bike Seat Post Aluminum Alloy Bicycle Seatpost Mountain Bike Saddle Pole Road Bike Seat Tube Mount Black

✓DIMENSION: Bicycle Seat Post Size: 300x27.2mm / 11.81"x1.07"(L*D), To fit frame seat post hole: 27.2mm / 1.07", Length: 300mm / 11.81", Tube thickness: 2.4mm / 0.09"
✓NOTE: Please do measure the actual outer diameter then choose the actually required diameter or measure the inner diameter of the frame tube before purchasing. A saddle clamp is not included, please purchase a saddle clamp if needed.
✓MATERIAL: The seat post is made of aluminum alloy, strong and durable materials for long time service.
✓EASY INSTALLATION: It is easy to install the saddle on this seat post. Just release the bolt of the old seat and unload the seat, then fix the seat on the new seat, and then install it to your bicycle rack. There is a safe line mark on the seat post. Please insert at least above the minimum safety line.
✓UNIVERSAL FIT: Suitable for most of mountain bikes, road bike, MTB etc.

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CYSKY Bike Seatpost 27.2 x 400mm with 4 Size Bike Seatpost Shim 28.6mm 30.4mm 30.9mm 31.6mm, Bicycle Seat Post for Mountain Bike Road Bike MTB BMX

CYSKY Bike Seatpost 27.2 x 400mm with 4 Size Bike Seatpost Shim 28.6mm 30.4mm 30.9mm 31.6mm, Bicycle Seat Post for Mountain Bike Road Bike MTB BMX

✓Material: Suspension SeatPost is made of high-strength aluminum alloy, anti-scratch and wear-resistant, light weight
✓Package include: 1x seat post (27.2x400mm), 4x seat post shim (28.6mm+30.4mm+30.9mm+31.6mm spacers)
✓Wide range of applications: We have added 4 size of seatpost spacers, respectively 27.2mm to 28.6mm, 27.2mm to 30.4mm, 27.2mm to 30.9mm, 27.2mm to 31.6mm, Make this seatpost suitable for more sizes bicycle, No longer have to worry about buying the wrong size and bring the trouble
✓Easy to install: To help you install it quickly and easily, we provide installation videos on the product detail page. If you have any questions, please feel free to contact us
✓The comfortable bike seatpost has a pain-relieving effect on the back area as it provides the best riding posture during cycling. Let you ride more easily in the process, have a better riding experience

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CYSKY Bike Suspension Seatpost 27.2 x 350mm with Bike Seatpost Shim 28.6mm 30.9mm 31.6mm, Shock Absorber Bicycle Seat Post for Mountain Bike Road Bike MTB BMX

CYSKY Bike Suspension Seatpost 27.2 x 350mm with Bike Seatpost Shim 28.6mm 30.9mm 31.6mm, Shock Absorber Bicycle Seat Post for Mountain Bike Road Bike MTB BMX

✓Material: Suspension SeatPost is made of high-strength aluminum alloy, anti-scratch and wear-resistant, light weight
✓Wide range of applications: We have added 3 size of seatpost spacers, respectively 27.2mm to 28.6mm, 27.2mm to 30.9mm, 27.2mm to 31.6mm, Make this seatpost suitable for more sizes bicycle, No longer have to worry about buying the wrong size and bring the trouble
✓Easy to install: To help you install it quickly and easily, we provide installation videos on the product detail page. If you have any questions, please feel free to contact us
✓Package include: 1x seat post (27.2mm x 350mm), 3x seat post shim (28.6mm+30.9mm+31.6mm spacers), 1x hexagonal wrench
✓The comfortable bike suspension seatpost has a pain-relieving effect on the back area as it provides optimal shock absorption during cycling. Let you ride more easily in the process, have a better riding experience

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33% Discount

DNM Suspension Mountain MTB Road Bike Bicycle Seatpost Seat Shock Absorber Post - Travel 20mm Vertical & 15mm Horizontal - Length 350mm - Recommended Load Weight 176-220 lbs - Clamp 30.9mm

DNM Suspension Mountain MTB Road Bike Bicycle Seatpost Seat Shock Absorber Post - Travel 20mm Vertical & 15mm Horizontal - Length 350mm - Recommended Load Weight 176-220 lbs - Clamp 30.9mm

✓SUSPENSION: Please check the seat post size before purchase. Length: 350 mm, Diameter: 30.9 mm. The seatpost acts as a suspension, absorbing vibrations to prevent pain and soreness.
✓TRAVEL: Seatpost Travel: 20 mm Vertical + 15 mm Horizontal. It provides sufficient travel for most riders. Minimum Insert: 90 mm. Rider Weight Recommendation: 176 to 220 lbs (80 to 100 kg).
✓ADJUSTMENT: The seatpost features preload adjustment. The copper bearing design ensures smoother damping.
✓QUALITY: Made of 3D forged alloy, which is the strongest and lightest aluminum alloy. Weight: 655 g (1.44 lbs).
✓CONFIDENCE IN QUALITY: We are confident in our product quality and offer a 2-year warranty.

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Bicycle Seat Post, 27.2mm/28.6mm Alumium Adjustable Seatpost Suspension Seat Post for Most Bicycle Mountain Bike Road Bike MTB MTN BMX Electric Bicycle (28.6 x 300 mm)

Bicycle Seat Post, 27.2mm/28.6mm Alumium Adjustable Seatpost Suspension Seat Post for Most Bicycle Mountain Bike Road Bike MTB MTN BMX Electric Bicycle (28.6 x 300 mm)

✓【 Good shock-absorption performance 】: The bike suspension seatpost built-in spring coil and rubber absorb vibration during cycling, soothing your riding experience and improving impact. Farewell to the pain in the buttocks while driving, the bicycle suspension seat may be affected by many impacts and vibrations. The maximum load-bearing is 100 kilograms.
✓【 Wide range of uses 】: The Bicycle Seat Post 1.07 x 11.81 inches standard size makes this suspension post suitable for most Racing bicycle, fixed gear bikes, mountain bikes, downhill bikes, cross-country bikes, BMX, DH and electric bikes.
✓【 Adjustable Suspension 】 The bicycle suspension seat column has a 40mm adjustable and ultra sensitive stroke. Adjust the preload and replace the springs to find the perfect setting, and adjust the seat pillar to your preferred cycling style. If you use an electric bicycle, it can also easily remove the battery from the seat.
✓【 Adjustable clamping angle 】: Bicycle Seat Post with a stable saddle platform, steering provides greater control and gentle driving. The bicycle suspension mount is a perfect upgrade for electric bicycles and folding bicycles. A more comfortable ride means that even on rugged terrain, you can ride longer, walk faster, and maintain control.
✓【 Easy to install, maintenance free 】: The suspension seatpost easy to install, can be completed in a few minutes. When lifting the seat, you need to press the button, and when putting down the seat, you also need to press the button and press it down at the same time. The product only includes the seat post (as shown in the picture), and other parts are not included. If you have any questions, please feel free to contact us and we will contact you within 24 hours.

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