30.9- mm Aluminum 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 73 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
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Cane Creek SP6A309
Ships Freeyour price $199.99 + ships free
BuyPART NUM 705891 
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 
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 
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 
Thomson Elite Seatpost Black 30.9 mm x 410 mm
4.5 of 5
( 4 )
4.5 of 5 stars average
( 4 reviews )
BuyPART NUM 972863
Over 40% stronger on ultimate strength test than the strongest production seatposts on the market. Over double the fatigue life of any other production … read more
4.5 of 5
( 4 )
4.5 of 5 stars average
( 4 reviews )
your price $114.95 + ships free
BuyPART NUM 972863 
Dimension Two-Bolt Seatpost 30.9 x 350 Matte Black
BuyPART NUM 546168
Dimension Two-Bolt Seatposts provide a sturdy and durable saddle perch for cross country and all-mountain riding in three diameters, rigorously tested … read more
your price $28.00
BuyPART NUM 546168 
RaceFace Ride XC Seatpost 30.9 x 375mm Black BuyPART NUM 283474
RaceFace Ride XC Seatposts made of forged AL-6061. 2-bolt head holds saddle securely while retaining easy adjustability Forged, anodized and shot … read more
your price $34.99
BuyPART NUM 283474 
Gusset Lofty XXL Seatpost, 30.9 X 450mm - Black BuyPART NUM 150263
Extra long forged 6061 aluminum post allowing maximum height adjustment 2-bolt micro-adjust clamp. 345g (27.2mm) Item Specifications … read more
your price $39.95 + ships free
BuyPART NUM 150263 
Thomson Elite Set Back Seatposts - Black - 30.9 x 410 mm BuyPART NUM 112698
The Elite Set Back Thomson Seatpost has a post and cradle which are machined from one piece of 7000 aluminum. Post and cradle are machined from one … read more
your price $114.95 + ships free
BuyPART NUM 112698 
Thomson Elite Seatpost Black 30.9 mm x 367 mm
4.6 of 5
( 5 )
4.6 of 5 stars average
( 5 reviews )
BuyPART NUM 503967
Over 40% stronger on ultimate strength test than the strongest production seatposts on the market. Over double the fatigue life of any other production … read more
4.6 of 5
( 5 )
4.6 of 5 stars average
( 5 reviews )
your price $114.95 + ships free
BuyPART NUM 503967 
Tranz-X Kitsuma Air Dropper Seatpost, 150mm, 30.9 x 455mm, Black BuyPART NUM 576550
Internal routing Lightweight alloy air cartridge adds rebound adjustment 7075 aluminum construction Upgraded internal bushings … read more
your price $185.00 + ships free
BuyPART NUM 576550 
Thomson Elite Set Back Seatposts - Black - 30.9 x 367 mm BuyPART NUM 304886
The Elite Set Back Thomson Seatpost has a post and cradle which are machined from one piece of 7000 aluminum. Post and cradle are machined from one … read more
your price $114.95 + ships free
BuyPART NUM 304886 
Whisky No.7 Alloy Seatpost 30.9 x 400mm 0mm Offset Matte Black
BuyPART NUM 789608
The No.7 Alloy seatposts are made to be durable, lightweight and comfortable. Whether you're remounting during the cross race, or abusing them on the … read more
Lowest Price10% offretail $70.00 Ends 12/10! $63.00 + ships free
BuyPART NUM 789608 
Ritchey Classic 2-Bolt Post, 30.9x350 - Silver
BuyPART NUM 616664
3D forged 2014 aluminum shaft, 2-bolt adjustable 2014 aluminum head 38mm rail clamping area. 245g (27.2x350mm) Item Specifications … read more
your price $69.95
BuyPART NUM 616664 
Thomson Masterpiece Seatposts Black 
Choose
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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Whisky No.7 Alloy Seatpost 30.9 x 400mm 18mm Offset Matte Black BuyPART NUM 224035
The No.7 Alloy seatposts are made to be durable, lightweight and comfortable. Whether you're remounting during the cross race, or abusing them on the … read more
Two remaining at this priceyour price $70.00 + ships free
BuyPART NUM 224035 
Salsa Guide Seatpost 30.9 x 400mm 0mm Offset Black
BuyPART NUM 986241
The Guide Seatpost features a highly adjustable two-bolt head design, built to be strong, reliable, and supportive when you need it most. Non-Offset … read more
your price $50.00 + ships free
BuyPART NUM 986241 
Race Face Turbine Seatpost, 30.9 x 400mm Black BuyPART NUM 433226
The Turbine seatpost sets a new standard for a performance aluminum post, featuring our new innovative Hunter head design that presents a rider with … read more
your price $89.99
BuyPART NUM 433226 
Salsa Guide Seatpost 30.9 x 400mm 18mm Offset Black BuyPART NUM 821024
The Guide Seatpost features a highly adjustable two-bolt head design, built to be strong, reliable, and supportive when you need it most. Offset … read more
10% offretail $50.00 Ends 12/10! $45.00 + ships free
BuyPART NUM 821024 
RaceFace Aeffect R Dropper Seatpost - 30.9 x 465mm, 170mm, Black BuyPART NUM 234584
Introducing the Aeffect R Dropper Post. Yes it's budget friendly and a rock solid option for riders wanting a simple, trouble-free dropper post - but … read more
your price $214.99 + ships free
BuyPART NUM 234584 
"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.
"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!"
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.
"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."
"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.'
"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.
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These products are one of our best sellers.
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.
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