MenuMenuModern Bike

25.4- mm 350+ 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.

Seatpost length is measured in millimeters. It is typically measured from the bottom of the post to the center of the rail mount.

SortSort

Showing 42 products:

Origin8 Pro-Fit Seatpost, 25.4 x 400mm, Silver
Origin8 Pro-Fit Seatpost, 25.4 x 400mm, Silver

Forged AL6061-T6 alloy construction Micro-adjust 2-bolt hinged clamp design Extra-long 400mm post 0mm setback Outer Diameter: … read more

13% offretail $34.39 your price $29.99

BuyBuyPART NUM 218549
FSA SL-K Carbon Post, (SB0) 25.4 X 350mm
FSA SL-K Carbon Post, (SB0) 25.4 X 350mmFull Speed Ahead

Carbon fiber mast bonded to 6061 aluminum clamp/head SB0: zero clamp offset, head is inline with post, and features a Minimal Top Clamp to … read more

your price $102.80 + ships free

BuyBuyPART NUM 490641
FSA SL-K Carbon Post, (SB20) 25.4 X 350mm SBS
FSA SL-K Carbon Post, (SB20) 25.4 X 350mm SBSFull Speed Ahead

Carbon fiber mast bonded to 6061 aluminum clamp/head SB20: 20mm clamp offset features an alloy two bolt Side-By-Side (SBS) head for added … read more

your price $102.80 + ships free

BuyBuyPART NUM 295613
Sunlite Adjustable Suspension Seatpost, 25.4mm x 350mm, Silver
Sunlite Adjustable Suspension Seatpost, 25.4mm x 350mm, SilverSunlite

Adjustable pre-load design Coil spring provides plush suspension Micro adjust seat clamp Outer Diameter: 25.4mm Length: … read more

StarStarStarStarStar 5 of 5 ( 1 ) 5 of 5 stars ( 1 review )

your price $32.99

BuyBuyPART NUM 114147
Sunlite Adjustable Suspension Seatpost, 25.4mm x 350mm, Black
Sunlite Adjustable Suspension Seatpost, 25.4mm x 350mm, BlackSunlite

Adjustable pre-load design Coil spring provides plush suspension Micro adjust seat clamp Outer Diameter: 25.4mm Length: … read more

StarStarStarStarStar 5 of 5 ( 1 ) 5 of 5 stars ( 1 review )

your price $31.99

BuyBuyPART NUM 391465
Sunlite Alloy Seatpost, 25.4, 350mm, Silver
Sunlite Alloy Seatpost, 25.4, 350mm, SilverSunlite

Forged alloy construction Integrated index adjust seat clamp Weight: 325g Outer Diameter: 25.4mm Length: 350mm Color: … read more

your price $19.99

BuyBuyPART NUM 836569
Kalloy Uno 602 Seatpost 25.4 x 350mm Silver
Kalloy Uno 602 Seatpost 25.4 x 350mm Silver

Item Specifications Clamp Style: Standard Rails Color: Silver … read more

your price $18.99

BuyBuyPART NUM 914898
Zipp Speed Weaponry Service Course SL Seatpost, 20mm Setback, 25.4mm Diameter, 400mm Length, Matte Black, C2
Zipp Speed Weaponry Service Course SL Seatpost, 20mm Setback, 25.4mm Diameter, 400mm Length, Matte Black, C2

Matching Zipp Service Course SL bars and stems in both form and function. Dual bolt, low profile micro adjust cradle Machined internal shaft … read more

your price $172.00 + ships free

BuyBuyPART NUM 492725
Kalloy SP-265 UNO Seatpost, 20mm, 25.4 x 350mm, Sandblast Silver
Kalloy SP-265 UNO Seatpost, 20mm, 25.4 x 350mm, Sandblast Silver

Heat treated 6061 sandblast aluminum (matte finish) 2D forged 1-bolt head 30mm rail clamping area 270g (27.2mm) Item Specifications … read more

your price $19.99

BuyBuyPART NUM 203204
Sunlite Alloy Seatpost, 25.4, 350mm, Black
Sunlite Alloy Seatpost, 25.4, 350mm, BlackSunlite

Forged alloy construction Integrated index adjust seat clamp Weight: 325g Outer Diameter: 25.4mm Length: 350mm Color: … read more

your price $19.99

BuyBuyPART NUM 505282
Zipp Speed Weaponry Service Course SL Seatpost, 0mm Setback, 25.4mm Diameter, 400mm Length, Matte Black, C2
Zipp Speed Weaponry Service Course SL Seatpost, 0mm Setback, 25.4mm Diameter, 400mm Length, Matte Black, C2

Matching Zipp Service Course SL bars and stems in both form and function. Dual bolt, low profile micro adjust cradle Machined internal shaft … read more

your price $172.00 + ships free

BuyBuyPART NUM 870373
Kalloy SP-265 UNO Seatpost, 25.4 x 350mm, Sandblast Black
Kalloy SP-265 UNO Seatpost, 25.4 x 350mm, Sandblast Black

Heat treated 6061 sandblast aluminum (matte finish) 2D forged 1-bolt head 30mm rail clamping area 270g (27.2mm) Item Specifications … read more

your price $19.99

BuyBuyPART NUM 699915
Sunlite Unicycle Seatpost, 25.4, 400mm, Chrome
Sunlite Unicycle Seatpost, 25.4, 400mm, ChromeSunlite

Desription: 4-Bolt Post Outer Diameter: 25.4mm Length: 400mm Color: Chrome Material: Steel Setback: 0mm … read more

your price $17.99

BuyBuyPART NUM 383740
Sunlite Pillar Suspension Post, 25.4mm x 350mm, Silver, No Clamp
Sunlite Pillar Suspension Post, 25.4mm x 350mm, Silver, No ClampSunlite

Adjustable pre-load design Coil spring suspension Collar adjustment for play removal Outer Diameter: 25.4mm Length: 350mm … read more

your price $28.00

BuyBuyPART NUM 998701
Pure Cycles Seat Post, 25.4mm x 350mm, Silver Seatpost
Pure Cycles Seat Post, 25.4mm x 350mm, Silver Seatpost

The Pure Cycles seatpost is a no frills no nonsense seatpost perfect for a basic replacement Clamp Size: 25.4mm Length: 350mm Color: Silver Material: … read more

your price $25.99

BuyBuyPART NUM 239655
Kalloy SP-200 Seatpost, 25.4 X 350mm Silver
Kalloy SP-200 Seatpost, 25.4 X 350mm Silver

Straight post for saddles with built-in clamp Machined 2014 anodized aluminum Item Specifications diameter: 25.4mm length: 350mm … read more

StarStarStarStarStar 5 of 5 ( 2 ) 5 of 5 stars average ( 2 reviews )

your price $7.99

BuyBuyPART NUM 665582
Sunlite Alloy Pillar Seatpost, 25.4, 350mm, Silver, No Clamp
Sunlite Alloy Pillar Seatpost, 25.4, 350mm, Silver, No ClampSunlite

Forged alloy construction Pillar style design Outer Diameter: 25.4mm Length: 350mm Color: Silver Material: Alloy … read more

your price $13.99

BuyBuyPART NUM 681929
Sunlite Alloy Pillar Seatpost, 25.4, 350mm, Black, No Clamp
Sunlite Alloy Pillar Seatpost, 25.4, 350mm, Black, No ClampSunlite

Forged alloy construction Pillar style design Outer Diameter: 25.4mm Length: 350mm Color: Black Material: Alloy … read more

your price $15.99

BuyBuyPART NUM 539790
Full Speed Ahead

"We move forward with a desire to deliver the best possible components to our customers and a determined spirit of competition."

See all Full Speed Ahead

Sunlite

"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!"

See all Sunlite

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

Rigid seatposts are the most common type of seatpost with no suspension or dropping capability.

Seatpost Clamp Style

Our Lowest Price - This product is ineligible for additional discounts or rebates.

These products are one of our best sellers.

On a dropper post, this is the distance that the post will drop.

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.