What is the top dimension of the 25.4mm post.

The top part (the narrower part) for holding the clamp, it's diameter is about 22.15mm.

Help! 25.4mm is too thin that it falls into the frame and I can’t tighten around the seat post any tighter. What should I do?

If you're set on keeping this post, you could always purchase shims

My seat clamp says 25.4-28.6. What does that mean and will this post fit with seat clamp?

The post that i ordered was 27.2 so your clamp can fit into when you tighten it

If you are asking will a 30mm seakt post fit a 31.8 mm ophening in frame- no.

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UPANBIKE Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose

UPANBIKE Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose

Product ID: 259984093

Details

Brand
UPANBIKE
Colour
Black
Manufacturer
UPANTECH
Material
Aluminum
UPC
767452332928

📏350mm length - optimal height range

🔩4 diameter sizes - perfect fit guaranteed

⚙️6061 aluminum alloy - ultra durable

$31.41

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Details

Brand
UPANBIKE
Colour
Black
Manufacturer
UPANTECH

Description

🚴‍♂️ Elevate your ride, dominate every trail.

EFFORTLESS UPGRADE - Simple installation compatible with most saddles (clamp sold separately) for a quick performance boost.
PRECISION SAFETY MARK - Integrated safe line ensures secure installation and peace of mind on every ride.
ENGINEERED FOR ENDURANCE - Crafted from high-strength 6061 aluminum alloy for lasting performance and lightweight agility.
STREAMLINED RIDING POSTURE - 350mm length enables an aerodynamic forward-leaning position to reduce drag and boost speed.
TAILORED FIT ZERO GUESSWORK - Available in four precise diameters (25.4mm, 27.2mm, 28.6mm, 31.6mm) to seamlessly match your bike frame.

The UPANBIKE Aluminum Alloy Bike Seat Post is a robust, lightweight 350mm seatpost made from premium 6061 aluminum alloy. Designed for mountain and fixed gear bikes, it offers four diameter options to ensure a perfect fit. Featuring a safety insertion line and compatibility with most saddles, it enhances riding posture by enabling a forward-leaning position that reduces drag. Ideal for riders seeking durability, precision, and performance upgrades.

Specifications

ASIN	B0789GQ412
Bike Type	Mountain Bike
Brand	UPANBIKE
Brand Name	UPANBIKE
Color	Black
Colour	Black
Customer Reviews	4.5 out of 5 stars 2,500 Reviews
Manufacturer	UPANTECH
Manufacturer Part Number	50-188-N
Material	Aluminum
Material Type	Aluminum
Model Number	50-188-N
UPC	767452332928

Reviews

A**R

Excellent size and quality

Perfect size and excellent quality

3.04.2021

D**8

Excellent

As described and fast delivery.

18.08.2020

A**E

Good post at a great price!

I ordered this as I replaced an angled seat with another one that required a straight post. It fit perfectly and attached easily to the seat.

20.03.2026

B**S

Fits perfectly

Great product fits the e bike perfectly

2.09.2023

E**D

It's all good as described now using on my bike

Got sent the wrong size but they replaced it with correct one.

11.10.2020

R**R

Be sure of post diameter.

Classic seat post.. Perfect fit , nice finish, compliments the frame quite well. Easy installation.

17.03.2025

貧**ー

かっこいい

最初はキツいかなと思いましたが、無事に自転車本体の接続完了付けてみてカッコイイと思いました。気分転換にもお勧めです

15.07.2022

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$31.41

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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