

Hero image 0 of Upanbike Bike Seat Post Diameter 25.4/27.2/28.6/30.4/30.9/31.6mm Extra Long 17.7inch Aluminum Alloy Bicycle Seatpost (Φ30.4mm), 0 of 3
Upanbike Bike Seat Post Diameter 25.4/27.2/28.6/30.4/30.9/31.6mm Extra Long 17.7inch Aluminum Alloy Bicycle Seatpost (Φ30.4mm)
Upanbike Bike Seat Post Diameter 25.4/27.2/28.6/30.4/30.9/31.6mm Extra Long 17.7inch Aluminum Alloy Bicycle Seatpost (Φ30.4mm)Upanbike Bike Seat Post Diameter 25 4 27 2 28 6 30 4 30 9 31 6mm Extra Long 17 7inch Aluminum Alloy Bicycle Seatpost 30 4mmUpanbike Bike Seat Post Diameter 25 4 27 2 28 6 30 4 30 9 31 6mm Extra Long 17 7inch Aluminum Alloy Bicycle Seatpost 28 6mmUpanbike Bike Seat Post Diameter 25 4 27 2 28 6 30 4 30 9 31 6mm Extra Long 17 7inch Aluminum Alloy Bicycle Seatpost 27 2mmUpanbike Bike Seat Post Diameter 25 4 27 2 28 6 30 4 30 9 31 6mm Extra Long 17 7inch Aluminum Alloy Bicycle Seatpost 25 4mmUpanbike Bike Seat Post Diameter 25 4 27 2 28 6 30 4 30 9 31 6mm Extra Long 17 7inch Aluminum Alloy Bicycle Seatpost 31 6mmUpanbike Bike Seat Post Diameter 25 4 27 2 28 6 30 4 30 9 31 6mm Extra Long 17 7inch Aluminum Alloy Bicycle Seatpost 30 9mm
Size:450*30.4mm
Key item features
- Frame Compatibility: To fit frame seatpost hole: 30.4mm.
- Material & Weight: Made from 6061 T6 Aluminum alloy, weighing approximately 380g.
- Extra Length: Extra-long 17.7 inches (450mm) helps tall riders avoid bending too much forward.
- Adjustable Clamp: Clamp is adjustable for the saddle tilt angle.
- Diameter Options: Available in diameters 25.4/27.2/28.6/30.4/30.9/31.6mm.
- Installation Tip: Insert the post into the bike frame hole and lock the seatpost clamp before turning the fixing bolt with a hexagon screwdriver.
- Weight Limit: Not recommended to exceed 220 lbs (100kg) on this seatpost.
- Measurement Guide: Measure the exact post diameter needed for your bike to ensure proper fit.
Generated by AI
Specs
- Diameter30.4
- Bicycle seatpost typeBicycle Seatpost
- MaterialAluminum alloy
- ColorBlack
- Weight1 lb
- Bicycle typeMountain Bikes
Current price is USD$16.99
Price when purchased online
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Columbus, 43215
Arrives by Sat, Jan 31
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Sold by Abuyamoy|Pro Seller
Fulfilled by Walmart
4.32015306122449 stars out of 5, based on 784 seller reviews(4.3)784 seller reviews
Free 90-day returns
About this item
Product details
Extra-long seatpost, length 17.7inch (450mm)
helps to increase the height of the saddle
so that tall riders don’t have to bend too much forward.
Material: Aluminum alloy
Diameter Choice: 25.4/27.2/28.6/30.4/30.9/31.6mm
Micro-adjust clamp:Adjust the tilt of the saddle
Free hexagon wrench attached
helps to increase the height of the saddle
so that tall riders don’t have to bend too much forward.
Material: Aluminum alloy
Diameter Choice: 25.4/27.2/28.6/30.4/30.9/31.6mm
Micro-adjust clamp:Adjust the tilt of the saddle
Free hexagon wrench attached
UPANBIKE Bike Seat Post Aluminum Alloy Extra Long 17.7inch(450mm) Replacement Bicycle Seatpost
- To fit frame seatpost hole:30.4mm.
- Important note: real measure of the seatpost diameter is a little smaller than the number marks on it. e.g.:25.4mm one may measures about 25.0~25.2mm only.
- Replacement seatpost for most bike, mountain bike, road bike, universal bikes.
- Clamp is adjustable for the saddle tilt angle.
Installation Tips:
If you find it hard to turn the fixing bolt at first time, please insert the post into bike frame hole and lock the seatpost clamp, then you can turn the bolt easily with a hexagon screwdriver. After the bolt is moved at first time, it can be moved easily afterwards.
Specifications
Material:6061 T6 Aluminum alloy
Color:black
Weight:about 380g
Length:450mm
Tube thickness:2.5mm,high strength.
Tube Outter diameter:25.4mm,27.2mm,28.6mm,30.4mm,30.9mm,31.6mm.
Extra Length:Help to raise height of saddle,
so that tall rider do not have to bent much forward.
Features:
Clamp is adjustable for the saddle tilt angle
Package includes:
1 X Bike Seatpost
Pay attention:
normally it's not supposed to put over 220 lbs(100kg) on this seatpost.
How to measure and confirm the diameter that you need
Please do measure and confirm the exact post diameter that you need for your bike. Otherwise you may find it too small or too large for your bike frame seat post hole, then you'll have to spend more time to return it. Thank you for your support.
There are two ways to confirm the diameter that you exactly need.
1. Check the diameter mark on your old seat post, normally there's a size mark on your old seat post. For example, if there's a mark " Φ25.4"on your old seat post, then you can buy a new 25.4mm seat post.
2. If you have a vernier caliper, measure your old seatpost diameter, or measure the inner diameter of the seatpost hole, then buy a similar size new seat post. For example, if the measurement is about 27.1mm, then select a 27.2mm seat post will do.
3. If you don't have a vernier caliper, use a small stick to measure the inner diameter of the seat post hole (see the picture showing)
info:
We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it.
Specifications
Diameter
30.4
Bicycle seatpost type
Bicycle Seatpost
Material
Aluminum alloy
Brand
upanbike
Warranty
Warranty information
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| Bicycle seatpost type | Bicycle SeatpostUpanbike Bike Seat Post Diameter 25.4/27.2/28.6/30.4/30.9/31.6mm Extra Long 17.7inch Aluminum Alloy Bicycle Seatpost (Φ30.4mm) | Bicycle Seatpost25.4x300mm Seatposts Aluminum Alloy Lengthened Tube Rod Road Bike Accessories Bicycle Seat Post | -UPANBIKE Aluminum Alloy Bike Seat Post Length 350mm Black for Mountain Bike Fixed Gear Bike Seatpost(?25.4mm) | Bicycle Seatpost28.6x300mm Seatposts Aluminum Alloy Lengthened Tube Rod Road Bike Accessories Bicycle Seat Post | Bicycle SeatpostKALLORY Black Aluminum Alloy Adjustable Dropper Seat Post for Mountain Bikes Cycling Accessories | Bicycle SeatpostYSNOOWE Road Bike Seatpost 1Pcs Black Aluminum Alloy for 30.8mm | -Bicycle Seatpost 300mm Mountain Bike Seat Tube Aluminum Alloy Integrate Seatpost 25.4 27.2 28.6 30.4 30.8 31.6mm MTB Saddle Post | Bicycle SeatpostKCAHPAN Bicycles Seatpost Steel 25.4mm Extender Length for Seats Post Great Performances |
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| Material | Aluminum alloyUpanbike Bike Seat Post Diameter 25.4/27.2/28.6/30.4/30.9/31.6mm Extra Long 17.7inch Aluminum Alloy Bicycle Seatpost (Φ30.4mm) | Aluminum Alloy25.4x300mm Seatposts Aluminum Alloy Lengthened Tube Rod Road Bike Accessories Bicycle Seat Post | Aluminum alloyUPANBIKE Aluminum Alloy Bike Seat Post Length 350mm Black for Mountain Bike Fixed Gear Bike Seatpost(?25.4mm) | Aluminum Alloy28.6x300mm Seatposts Aluminum Alloy Lengthened Tube Rod Road Bike Accessories Bicycle Seat Post | aluminum alloyKALLORY Black Aluminum Alloy Adjustable Dropper Seat Post for Mountain Bikes Cycling Accessories | carbon fiberYSNOOWE Road Bike Seatpost 1Pcs Black Aluminum Alloy for 30.8mm | Plastic, metalBicycle Seatpost 300mm Mountain Bike Seat Tube Aluminum Alloy Integrate Seatpost 25.4 27.2 28.6 30.4 30.8 31.6mm MTB Saddle Post | 钢KCAHPAN Bicycles Seatpost Steel 25.4mm Extender Length for Seats Post Great Performances |
| Color | BlackUpanbike Bike Seat Post Diameter 25.4/27.2/28.6/30.4/30.9/31.6mm Extra Long 17.7inch Aluminum Alloy Bicycle Seatpost (Φ30.4mm) | Black25.4x300mm Seatposts Aluminum Alloy Lengthened Tube Rod Road Bike Accessories Bicycle Seat Post | Black 25.4 x 350mmUPANBIKE Aluminum Alloy Bike Seat Post Length 350mm Black for Mountain Bike Fixed Gear Bike Seatpost(?25.4mm) | Black28.6x300mm Seatposts Aluminum Alloy Lengthened Tube Rod Road Bike Accessories Bicycle Seat Post | BlackKALLORY Black Aluminum Alloy Adjustable Dropper Seat Post for Mountain Bikes Cycling Accessories | BlackYSNOOWE Road Bike Seatpost 1Pcs Black Aluminum Alloy for 30.8mm | 25.4*300Bicycle Seatpost 300mm Mountain Bike Seat Tube Aluminum Alloy Integrate Seatpost 25.4 27.2 28.6 30.4 30.8 31.6mm MTB Saddle Post | BlackKCAHPAN Bicycles Seatpost Steel 25.4mm Extender Length for Seats Post Great Performances |
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Customer ratings & reviews
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Showing 1-3 of 10 reviews
Aug 8, 2025
anonymous
Item details
Sold byAbuyamoyDelivered byWalmartSize: 450*30.8mm
5 out of 5 stars review
Verified Purchase
Good post for MTB
Make sure you order the correct size, that's the most important. Quality was very good for the price, maybe it wasn't the quality of the original post, but I'm sure that one cost a lot more. This product was well worth the price, it fit perfect and installing the seat on this new post was easy (make sure it's tight) and works perfectly. Totally replaced the original but much longer like I needed.
Helpful?3TTMG51TB4DY886448899
Apr 12, 2025
CMM
Top Reviewer
Item details
Sold byAbuyamoyDelivered byWalmartSize: 450*27.2mm
5 out of 5 stars review
Verified Purchase
It fit my bike
be sure to measure your diameter of your old one because I end up with the wrong one and had to order this one
Helpful?3TTMG51TB4DY886448899
Oct 15, 2024
rita
Item details
Sold byAbuyamoyDelivered byWalmartSize: 450*25.4mm
5 out of 5 stars review
Verified Purchase
quality post
this is a solid seatpost. i really don't have any negatives. bought a second for another bike. factory posts too short and heavy
Incentivized Review
Helpful?3TTMG51TB4DY886448899
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