Aluminum 403+ mm Bicycle Seatposts
Seatpost length is measured in millimeters. It is typically measured from the bottom of the post to the center of the rail mount.
Contact Modern Bike via email, telephone, or showroom visit.
learn more
You may check the order status of a recent purchase to learn if it has been delayed, when it may ship, or if it has already been shipped.
check order status
Your Shopping Cart contains 0 products. View your cart to change product quantities, apply deal codes, or checkout.
Sort
Showing 55 products:
Thomson Elite Set Back Seatposts - Black - 31.6 x 410 mm
BuyPART NUM 786360
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
popular
In Store
Ships Freeyour price $114.95 + ships free
BuyPART NUM 786360 
Thomson Elite Set Back Seatposts - Black - 27.2 x 410 mm BuyPART NUM 404104
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 … read more
your price $114.95 + ships free
BuyPART NUM 404104 
Thomson Covert Dropper Seatpost, 150mm, 31.6 x 450mm, Black BuyPART NUM 646771
Applying four decades of expertise, Thomson has set the bar with the Covert dropper Custom made Norglide bearing bushings and Trelleborg … read more
your price $479.95 + ships free
BuyPART NUM 646771 
Thomson Elite Seatpost Black 27.2 mm x 410 mm
4.5 of 5
( 4 )
4.5 of 5 stars average
( 4 reviews )
BuyPART NUM 752601
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 752601 
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 
Crank Brothers Highline 3 Dropper Seatpost - 27.2, 125mm, Black BuyPART NUM 994764
The all-new Highline delivers infinite adjustment, smooth feel, and easy installation for any bike. Remote sold separately. Shorter insertion … read more
$24 offretail $249.00 your price $224.10 + ships free
BuyPART NUM 994764 
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 Silver - 27.2 mm x 410 mm
4.5 of 5
( 4 )
4.5 of 5 stars average
( 4 reviews )
BuyPART NUM 551459
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 551459 
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
$17 offretail $185.00 your price $168.00 + ships free
BuyPART NUM 576550 
Cirrus Kinekt Suspension Seatpost - Aluminum, 31.6, 420mm, XR- 180-320lb Rider, Black BuyPART NUM 906594
The Kinekt Active XR Aluminum Suspension Seatpost is sleek and versatile, providing 35mm travel with pre-load capability to effectively isolate your body … read more
your price $269.95 + ships free
BuyPART NUM 906594 
Thomson Elite Set Back Seatposts - Silver 
Choose
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
Silver180 g, 220 g, 265 g27.2 mm Diameter, 30.9 mm Diameter250 mm Length, 330 mm Length, 410 mm Length16 mm OffsetAluminumRigidStandard
your price $114.95 + ships free
Choose 
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 
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 Seatpost Black 27.0 mm x 410 mm
4.5 of 5
( 4 )
4.5 of 5 stars average
( 4 reviews )
BuyPART NUM 467218
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 467218 
Thomson Elite Seatpost Black 31.6 mm x 410 mm
4.5 of 5
( 4 )
4.5 of 5 stars average
( 4 reviews )
BuyPART NUM 113940
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 113940 
Tranz-X Kitsuma LT Dropper Seatost, 150mm, 31.6 x 464mm, Black BuyPART NUM 721508
Interal cable routing Low maintenance sealed hydraulic cartridge and coil spring 7075 alloy construction and hard anodized 26mm stanchion … read more
your price $159.00 + ships free
BuyPART NUM 721508 
Thomson Elite Seatpost Silver - 31.6 mm x 410 mm
4.5 of 5
( 4 )
4.5 of 5 stars average
( 4 reviews )
BuyPART NUM 833755
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 833755 
RaceFace Aeffect R Dropper Seatpost - 31.6 x 425mm, 150mm, Black BuyPART NUM 446041
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 446041 
Redshift Sports ShockStop Suspension Seatpost, 31.6 X 450 Black BuyPART NUM 992840
Ultra responsive suspension seatpost provides 35mm of bump eating comfort Minimal, subtle design blends seamlessly with the aesthetic of … read more
your price $229.99 + ships free
BuyPART NUM 992840 
Redshift Sports ShockStop Suspension Seatpost, 30.9 X 450 Black BuyPART NUM 540571
Ultra responsive suspension seatpost provides 35mm of bump eating comfort Minimal, subtle design blends seamlessly with the aesthetic of … read more
your price $229.99 + ships free
BuyPART NUM 540571 
Thomson is leading with innovative design for two primary markets - aerospace and cycling.
"We move forward with a desire to deliver the best possible components to our customers and a determined spirit of competition."
"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."
We define color as the main color of the item. It may have accents or highlights in other colors.
Weight
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
Rigid seatposts are the most common type of seatpost with no suspension or dropping capability.
Seatpost Clamp Style
On a dropper post, this is the distance that the post will drop.
Dropper posts have the ability to change heights. This has become a choice for mountain bike riders that prefer multiple riding positions.
Our Lowest Price - This product is ineligible for additional discounts or rebates.
Suspension seatposts are designed with comfort in mind.
Seatpost length is measured in millimeters. It is typically measured from the bottom of the post to the center of the rail mount.
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.