30.9 mm Bicycle Seatposts
The seatpost diameter must match to the seat tube diamater of your frame. If replacing a seatpost, you can usually find this measurement etched near the bottom of your current post.
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Showing 274 products:
Cane Creek Thudbuster ST G4 Suspension Seatpost - 30.9 x 375mm, 50mm, Black
BuyPART NUM 705891
Building on Thudbuster's proven parallel linkage technology Cane Creek has completely re-designed the seatpost for increased durability, a higher rider … read more
In Store
Cane Creek SP6A309
Ships Freeyour price $199.99 + ships free
BuyPART NUM 705891 
OneUp Components Dropper Post, (180mm) 30.9x480mm BuyPART NUM 177602
New OneUp dropper line covers 100-210mm drops in 10mm increments Shortest overall length and stack height of any equal length dropper on … read more
$38 offretail $267.50 your price $229.50 + ships free
BuyPART NUM 177602 
Thomson Masterpiece Seatposts Black
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The Thomson Masterpiece Seatpost is not for everyone. We at Thomson wanted to create the best seatpost possible without regard to cost. The … read more
Black158 g, 199 g27.2 mm Diameter, 30.9 mm Diameter, 31.6 mm Diameter240 mm Length, 330 mm Length, 350 mm Length0 mm OffsetAluminumRigidStandard
your price $159.95 + ships free
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SDG I-Beam Unidirectional Carbon Micro-Adjust Seatpost 0mm Setback 30.9x400mm BuyPART NUM 941165
SDG I-Beam Micro Carbon Seatposts. I-Beam technology eliminates seat rails for a single beam incoporated into the saddle shell. I-Beam provides the … read more
$35 offretail $129.99 your price $94.99
BuyPART NUM 941165 
DT-Swiss D 232 Dropper Post, 60mm, 30.9 x 400mm, Carbon
BuyPART NUM 786169
Developed for cross country riding and racing Upside down technology allows for a very robust release mechanism The fully mechanical … read more
$100 offretail $368.90 your price $268.90 + ships free
BuyPART NUM 786169 
Tranz-X Kitsuma Air Dropper Post, 170mm, 30.9 x 495mm, Black BuyPART NUM 219248
Internal Routing Lightweight alloy air cartridge adds rebound adjustment 7075 aluminum construction Upgraded internal bushings … read more
your price $159.00 + ships free
BuyPART NUM 219248 
Tranz-X Hot Lap Dropper Seatpost, 50mm, 30.9 x 400mm, Black BuyPART NUM 272711
Internal cable routing Suited for gravel, XC and CX Lightweight hydraulic cartridge Item Specifications travel/drop: … read more
your price $129.99 + ships free
BuyPART NUM 272711 
Bike Yoke Revive Seatpost With Triggy Remote (125) 30.9 x 397mm, Black
5 of 5
( 1 )
5 of 5 stars
( 1 review )
BuyPART NUM 433261
Self-serviceable dropper post with reset button at the head Non-IFP design provides better reliability and extremely smooth action … read more
5 of 5
( 1 )
5 of 5 stars
( 1 review )
your price $374.99 + ships free
BuyPART NUM 433261 
Thomson Elite Covert Dropper Seatpost: 30.9 x 400mm 125mm Travel BuyPART NUM 213345
Item Specifications Length: 400 Diameter: 30.9 Travel: 125 Clamp Style: Std Rails … read more
your price $479.95 + ships free
BuyPART NUM 213345 
Kind Shock LEV Ci Dropper Seatpost, 30.9 x 390mm, 100mm, Black, No remote
BuyPART NUM 764365
LEV CI takes rhythm from the trail and injects it straight into your soul 65-175 millimeters of perfect drop are just enough to turn your … read more
your price $400.99 + ships free
BuyPART NUM 764365 
KS Supernatural 30.9 Post 435/150mm Remote - OPEN BOX SPECIAL BuyPART NUM 903421
Kindshock Height-Adjust Seatposts Micro-adjust, zero offset clamp Infinitely-adjustable ride height Carbon remote replaces an … read more
Clearance$69 offretail $366.00 your price $296.46
BuyPART NUM 903421 
Tranz-X Skyline Dropper Seatpost, 125mm, 30.9 x 410mm, Black BuyPART NUM 709306
Internal routing Sealed hydraulic cartridge 6061 construction Item Specifications travel/drop: 125mm diameter: … read more
your price $99.99 + ships free
BuyPART NUM 709306 
KS ExaForm Speed Up Hydro Dropper Seatpost - 30.9mm, 150mm, Black
5 of 5
( 1 )
5 of 5 stars
( 1 review )
BuyPART NUM 787461
KS ExaForm Speed Up Hydro dropper seatpost. Item Specifications Travel (mm): 150 Color: Black Clamp Style: Std Rails … read more
5 of 5
( 1 )
5 of 5 stars
( 1 review )
your price $59.00
BuyPART NUM 787461 
Tranz-X Jump Seat Dropper Seatpost, 100mm, 30.9 x 365mm, Black BuyPART NUM 474086
Easy to install and easy to operate No cables required Lever actuated under the saddle to drop and raise your saddle Seat height … read more
your price $119.00 + ships free
BuyPART NUM 474086 
Zoom SPS-521 Suspension Seatpost - 30.9, Black BuyPART NUM 332801
The Zoom SPS-521 suspension seatpost smoothes out road chatter and smaller bumps, providing a more comfortable, less fatiguing ride. Item Specifications … read more
your price $44.99
BuyPART NUM 332801 
Ritchey RL1 Post 30.9x400mm Black
BuyPART NUM 188402
Proven 2-bolt design provides balance between strength, weight and easy adjustability Diameter: 30.9mm Length: 400mm Setback: zero Material: alloy … read more
your price $31.95
BuyPART NUM 188402 
KS ETEN Cable-Actuated Post 100mm drop, 30.9x385mm, Remote Sold Separately. BuyPART NUM 689943
Cable-Actuated, Remote Sold separately Alloy mast Black hard anodized stanchion Forged head with 20mm offset Black laser … read more
5% offretail $105.00 your price $100.00 + ships free
BuyPART NUM 689943 
Sunlite Alloy Seatpost, 30.9, 350mm, Black
BuyPART NUM 167908
Forged alloy construction Integrated index adjust seat clamp Weight: 325g Outer Diameter: 30.9mm Length: 350mm Color: … read more
your price $19.99
BuyPART NUM 167908 
KS LEV Post without Remote, 80mm, 30.9 x 295mm, Black BuyPART NUM 527961
External cable routing with adjustable rotational orientation (This feature is not the same as earlier generation LEV models Precision machined … read more
$30 offretail $309.00 your price $278.10 + ships free
BuyPART NUM 527961 
Cane Creek G4 Thudbuster-LT Seatpost, 30.9 X 420mm
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
BuyPART NUM 636243
90mm of travel for XC, Gravel or Comfort use Patented 4-pivot parallel linkage with PTFE bushings Pedal to saddle distance remains … read more
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
your price $199.99 + ships free
BuyPART NUM 636243 
"The world's best choose Cane Creek. A key element of Cane Creek's mission is to support the sport of cycling, including racing, charitable activities and cycling advocacy. Cane Creek believes strongly in the power of bicycles and their potential to effect positive change in our society. To that end, Cane Creek supports athletes and teams whose purpose encompasses more than competitive racing, such as getting more people on bikes, improving or promoting a healthy lifestyle, and making our world better through the use of a bike."
Thomson is leading with innovative design for two primary markets - aerospace and cycling.
Driven by the vision of becoming a worldwide known manufacturer of bicycle components, DT Swiss expanded its product range over the years. Today DT Swiss has established itself as a leading manufacturer of spokes, nipples, hubs, rims, complete wheels as well as suspension systems.
"Ritchey bicycle components have been raced to victory in some of the biggest cycling competitions in the world including the UCI World Championships, the Tour de France and the Olympics and it all began in a simple garage in Menlo Park, California with Tom Ritchey.'
"Every year bikes change, styles and trends evolve, old bikes are in need of repairs and new bikes are waiting for that personal touch. We provide the means to keep your bike on the road and fun to ride!"
"Whisky Parts Co. makes high quality carbon components designed with unique features that help you do more with your bike and stand out from the rest. We believe that our work can help every rider find a new level of confidence and performance with our sturdy and lightweight forks, bars, rims and more. So whether you are building a new bike or upgrading one you already have, you'll find an uncommon attention to detail in every product we offer."
Dimension makes quality components to repair or custom-fit the vast majority of bikes being ridden today, and provide the accessories that make them fun to ride.
"At Salsa, we believe a sense of adventure makes life better. The bicycle can be so much more than just a bike; it's a path to new places, new people, and amazing experiences."
"We move forward with a desire to deliver the best possible components to our customers and a determined spirit of competition."
We define color as the main color of the item. It may have accents or highlights in other colors.
Weight
In Store products are available to view in our showroom. In Store orders usually ship the same or next business day.
These models are available for online purchasing and can be shipped directly to you.
The seatpost diameter must match to the seat tube diamater of your frame. If replacing a seatpost, you can usually find this measurement etched near the bottom of your current post.
Seatpost length is measured in millimeters. It is typically measured from the bottom of the post to the center of the rail mount.
Offset is often referred to as setback. This is the distance in mm that the clamp is offset from the center of the seatpost.
Seatpost Material
On a dropper post, this is the distance that the post will drop.
Suspension seatposts are designed with comfort in mind.
Seatpost Clamp Style
This is the part number or identifier for this item from the manufacturer
Dropper posts have the ability to change heights. This has become a choice for mountain bike riders that prefer multiple riding positions.
Rigid seatposts are the most common type of seatpost with no suspension or dropping capability.
Clearance items can save you big.
Weight
Buy this product and your entire order ships for free.
Some orders are inelligible for delivery discounts. See offer details for disqualifying products and destinations.