Questions tagged [seatpost]

Questions referring to the part of a bike that extends upward from the seat tube on the frame to the saddle.

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Dropper Post on Marlin 7 Gen 2 (2021)

I am looking to install a dropper post on my Trek Marlin 7 Gen 2 (2021) size XL. I am thinking I want to get a PNW Cascade 150mm. When I went to measure the seatpost to make sure, it stopped before ...
Thumbdrive's user avatar
0 votes
0 answers
43 views

Carbon seatpost stuck due to damaged grub screw

I have an Orbea Orca 2024 with Di2 and the grub screw for adjusting seat height has potential thread damage and it won't come out. The bike mechanic explained that the reason the grub screw went so ...
Lalit Chilka's user avatar
7 votes
2 answers
2k views

Copper pipe seatpost?

I have a 12 inch wheel girls bike with no seatpost. It turns out a 1 inch diameter copper water pipe fits. I know I could take some time and find a steel post but in this case does it matter? The seat ...
David D's user avatar
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2 votes
1 answer
46 views

Clicking/popping sound supposedly coming from the seat tube area

I have a recurring issue with an annoying sound that seems to come from the seat tube/post area. Upon riding on bumpy or rough roads, I can hear a clicking sound whose rhythm seems to follow the ...
silent bike's user avatar
0 votes
0 answers
25 views

Giant Revolt 1 2022 seatpost replacement

I am looking to get Giant Revolt 1. I saw there is a possibility of replacing seatpost to 30.9. I saw there is a shim on the front to tighten the seatposst. How does it work when you insert 30.9 ...
Toniq's user avatar
  • 121
0 votes
3 answers
115 views

What kind of seatpost this is?

Saw this seatpost in my spare box, any idea what kind of seatpost this is?
Clayde's user avatar
  • 79
-4 votes
1 answer
99 views

Is it possible to prove that applied forces to a top tube are worse than a seatpost when using a repair stand clamp?

This stems from the idea that you should use a bike stand clamp on a seatpost, if you can, for carbon fiber (CF) bike frames. Hopefully, this would avoid the cracking of a CF bike frame. In order to ...
cocobutters's user avatar
1 vote
1 answer
57 views

Avanti barrel/cylinder nut replacement?

I’m pretty sure I’ve stripped the barrel/cylinder nut on my Avanti bike’s seatpost clamp. The bolt goes in but just keeps spinning around. Is it possible to remove the nut from inside the frame? Or ...
Hekyeh's user avatar
  • 11
3 votes
4 answers
1k views

How do I unstuck this seat post? Materials unknown

I have a road bike and the seat post needs some height adjustments but for the love of me I can't get it unstuck. I have tried heating it a bit, I have tried bending it open as well as adding some ...
SirHawrk's user avatar
  • 161
0 votes
2 answers
352 views

How do I fix, repair, or replaace a bent seat post?

Awhile back, the seat post on my bicycle bent over. The seat post is a hollow metal tube located just underneathe the bike seat or bicycle saddle. How do you fix this problem?
Samuel Muldoon's user avatar
1 vote
0 answers
411 views

How to mount dropper post to Scott Scale without removing BB?

Do you know an easy way to install a dropper to Scott Scale 920 without removing bottom bracket? The frame looks like this: https://www.scott-sports.com/dk/en/product/scott-scale-920-bike And the ...
Politechniczny's user avatar
14 votes
7 answers
2k views

How to mark seatpost position?

Is there an effective, non-destructive way to mark the seatpost position? We share some bikes within the household, meaning that the saddle height is adjusted often. When I had an affordable Decathlon ...
Szabolcs's user avatar
  • 996
3 votes
1 answer
142 views

Diagnosing and fixing a noisy seatpost

I am having problems understanding the source of a noise. I would describe the noise as a intermittent crack or click that seems to come from where the seatpost encounters the frame. It stops when I ...
larsen's user avatar
  • 145
2 votes
0 answers
63 views

Should the seatpost clamp be installed backward for a carbon seatpost in an aluminum frame? [duplicate]

Is it true that the seatpost clamp must be installed backward (i.e. its slot facing the handlebars) or at least with a slight offset to avoid aligning its slot with the aluminum seat tube slot when ...
olliebulle's user avatar
  • 4,109
7 votes
13 answers
2k views

Aluminum seatpost broken into a steel frame

Similar to Aluminum seatpost stuck to a steel frame but worse, since the seatpost is broken exactly at the end of the seat tube. Image below. Below is a suggested fix using a quill stem as a "...
pippo1980's user avatar
  • 203
3 votes
3 answers
1k views

Trying to match up a new seat for my bicycle and having difficulty finding one that will work

Could someone please help me identify this bicycle? I cant find anything that looks like this on the internet. The reason I'm asking is because it needs a new seat, as the plastic has broken off from ...
TheShady97's user avatar
2 votes
3 answers
463 views

Repair damage to my seatpost clamp?

I am not sure I have the right terms, but here goes. I stopped in a bike shop to look around. It specialized in racing bikes. I asked the owner about why my glutes were always hurting after a bike ...
fixit7's user avatar
  • 1,232
4 votes
2 answers
645 views

Having discomfort from saddle, not sure if it from saddle height or wrong seating position

I recently got a second hand bike and on paper everything looks fine. It is a frame size S which says fits 160-175cm. I'm around the 169-170 range so I am right in the middle of the range so it should ...
Snox's user avatar
  • 41
6 votes
1 answer
172 views

Misaligned Carbon Rails on Brooks C13 Saddle not aligning to Seat Post Clamp

I have a [VNT Elements Seat Post] (https://shop.vannicholas.com/en/products/vnt-elements-accessories/VNT-Seatpost-Alloy-16-7mm-Setback/11326). This saddle has two bolts at the back and clamps onto the ...
Chasing Lakshmi's user avatar
1 vote
2 answers
695 views

Torque Specification for Brooks C13 Saddle with Carbon Rails

I wanted to know what the torque specification for this saddle (Brooks C13) would be. There is no torque spec/limit information on the Brooks website for this saddle. The concern is that the rails are ...
Chasing Lakshmi's user avatar
3 votes
2 answers
2k views

How to measure seatpost length

What are the standard measurement points for seatpost length? I am buying a new seatpost, and need to compare my old post to the "marketed" length of possible replacement posts to make sure ...
Chris Keefe's user avatar
3 votes
1 answer
57 views

Trimmed seatpost gets stuck without bottoming out

I have a new-to-me bike that I can comfortably standover, but I just cannot get the seat down as low as I need. Thinking I'd just need to trim the seatpost, I took it to my bike shop and they did it ...
wfc0003's user avatar
  • 31
3 votes
1 answer
185 views

Giant TCR advanced ( 2016 ) Carbon Seatpost

I have been considering making a foray into road bikes and ended up picking up a pretty pristine Giant TCR advanced 2016 bike for a bargain. I bought a size M and ended up figuring out that I actually ...
Swayam Siddha's user avatar
12 votes
6 answers
4k views

Is it safe to drill a cable exit hole in a seatpost?

I want to route a dynamo light wire internally from the front of the frame to the rear light. The wire enters the frame at the top of the down tube, runs around the bottom bracket, and up the seat ...
Will Vousden's user avatar
  • 3,981
2 votes
1 answer
3k views

Can a dropper post be added to a Giant bicycle with D-Fuse?

I just bought a Giant Revolt that comes with a D-Fuse seat post. I really hate this mechanism, I have to remove the seat frequently to store the bike. I was wondering if it's possible to change to a ...
Gonzalo Garcia's user avatar
11 votes
5 answers
5k views

Is it unsafe to have a seatpost "slammed"?

On my hardtail I have my seat post inserted as far as it can go, which is limited by bottle cage bolts. On my full suspension it's a slight bend in the seat tube that limits it. I'm concerned that I ...
bitmaker's user avatar
  • 138
3 votes
2 answers
328 views

How to calculate how strong is seat post?

Is 27.2mm seat post stronger than 25.4mm because it has bigger diameter? How to mathematically calculate how much 27.2mm stronger than 25.4mm provided both seat posts have same length, wall thickness ...
LilBro's user avatar
  • 564
2 votes
1 answer
605 views

Is there a way to add offset to Rockshox Reverb AXS dropper seatpost?

Does anyone have any suggestions on how to add offset to a Rockshox Reverb AXS seatpost? I saw a company called FAIR Bicycle that developed hardware to add offset (+ or -) to a Reverb, but it's not ...
PatrickL's user avatar
2 votes
2 answers
257 views

Cutting back seatpost binder slot

I've got a tandem with brazed on seatpost binder ears. The slot between them is so narrow that I can't clamp the seatpost with sufficient force: with the two sides bottomed out, the stoker can apply ...
Adam Rice's user avatar
  • 30k
3 votes
2 answers
447 views

Loosening up an over-tightened seatpost clamp

I recently purchased a used tandem. The stoker's seatpost is 27.2 mm diameter, and I'm not having any trouble with that. The captain's seatpost is a weird suspension seatpost that is less than 27.2 mm,...
Adam Rice's user avatar
  • 30k
6 votes
2 answers
764 views

Seatpost/saddle moving down when riding

I noticed that that my saddle started moving down when riding (maybe 1cm/hour). When cleaning the inside of the seattube I noticed that the part at the height of the clamp became smooth, compared to ...
Rеnаud's user avatar
  • 20k
1 vote
1 answer
112 views

Seat Post Compatibility

I have a Kona Stinkey Deluxe and someone recently stole the seat post. I remember the seat post and it was called the RaceFace Evolve DH. Was wondering if there were any other types of seat posts that ...
Keyin Liu's user avatar
  • 231
1 vote
2 answers
754 views

Dropper Seat Post Compatibility - Kona Mahuna 2021

I have a medium Kona Mahuna 2021 (Seat tube length 420mm and seat post diameter 31.6mm) which I would like to fit a dropper post on. The bike is 'dropper ready' with internal routing. I've never had a ...
mapface's user avatar
  • 197
14 votes
3 answers
7k views

Why are all road bike frames now squashed parallelograms?

I am currently shopping for a road bike and have questions about current frame designs. My height is 6'3" and decade(s) ago I always liked frame designs for which the top of the seatstays joined ...
wjktrs's user avatar
  • 545
3 votes
2 answers
912 views

Adjusting the saddle angle on a single bolt saddle clamp without grooves

I am about to buy a new seat post on the Internet. Looking at the pictures, the saddle clamp has a single bolt, but I can not understand how it could adjust the saddle angle. The seat post I ...
fabda01's user avatar
  • 209
2 votes
2 answers
1k views

Has anyone experience in using a Thomson Elite Setback Seatpost in the forward position?

Background: 54cm Cervelo R5 2013 with original UO Carbon seatpost. Seat is set as forward as possible and I'm using a shorter handle stem. Problem: Bike fitter stated I've got the body of someone 5'4&...
user59162's user avatar
1 vote
0 answers
152 views

How to remove loose seat post stuck down inside tube, without saddle to grip? [closed]

I was reading this forum the other day to see how I could get the seat post out of the frame. I was putting a new bike together and had never done so before. I messed up and let the post go into the ...
Jean's user avatar
  • 11
1 vote
1 answer
440 views

Trying to tighten a saddle clamp but nothing seems to give

I'm first trying to remove a stuck seat post through brute force. I've removed the wheels, fork, and chain so that it can more easily be worked with upside down. I began to turn the frame in a ...
m_antis's user avatar
  • 11
3 votes
4 answers
2k views

How to install a saddle on a seatpost with a top facing bolt

I recently purchased a new bike and I am trying to swap the original saddle for my own. On my previous bike both bolts holding the seat clamp together are down facing, i.e. accessible from below the ...
Alex Rose's user avatar
5 votes
1 answer
1k views

Seat post clamp bracket failure - how to repair?

I have a Jamis TAXI beach cruiser needing repair. Part of the bracket that is welded for holding the seat post clamp in place has come loose. The frame says T6 6061 aluminum. I am having trouble ...
Old Grouch's user avatar
4 votes
1 answer
166 views

Saddle / Seat slowly creeps backwards

So, over the course of several months, I notice that my saddle has been creeping backwards on the seat post. Road bike. Fizik seat post (two screws, one manual, one hex head.) Ti rail saddle. I tend ...
Mark Wistrom's user avatar
1 vote
0 answers
267 views

Specialized Roubaix Seat Post Rubber Seal Loose

On my Specialized Roubaix Comp, the rubber seal where the seat post enters the frame works loose and slides up the seat post a little. The seat post itself is not loose and stays put, the issue is ...
PatL's user avatar
  • 11
2 votes
1 answer
4k views

Torque of the rails or torque of the post?

I am building a bike and I am using a saddle with carbon rails on an alloy seatpost. I read that it's not an issue as long as the shape of the clamps is compatible with the shape of the rails, and in ...
Alessandro Cosentino's user avatar
2 votes
4 answers
980 views

Can I attach a rear cargo rack directly to the seat clamp?

I'd like to install a rear cargo rack on a bike that doesn't have eyelets for the top attachment. Would it be a bad idea to attach the rear rack stays to this seat clamp that's welded onto the frame, ...
chpatrick's user avatar
  • 121
1 vote
1 answer
448 views

Can I run an internal dropper post on a small size 2014 Giant XTC Advanced 2 (2014)?

The specific bike model is this one: https://www.giant-bicycles.com/au/xtc-advanced-27dot5-2-2014 The dropper post I am looking at is this one: Brand-X Ascend CX Dropper 105mm I was thinking I could ...
Kieran's user avatar
  • 27
6 votes
2 answers
939 views

I'd like to fit a suspension seatpost but have only 9 cm between saddle and frame - is this enough?

I'm 5'3" tall and ride an XS size gravel bike. I have only 9 cm of seatpost between the saddle and the frame, and you can see there's no possibility of extending that! I find the aluminium frame ...
Fiona's user avatar
  • 61
1 vote
1 answer
1k views

How to determine my bike's seat post clamp size?

My mountain bike came with a quick release clamp that reads '34' on its side (embossed or debossed, am forgetting. Reading online there are about 3 sizes for seat post clamps I went with i believe '...
slackexchange's user avatar
14 votes
4 answers
3k views

How to stop bike renters overextending seatposts?

A friend and I have been operating a bike rental shop for about a year, and just recently we've started to notice more and more customers extending the seatpost well beyond the maximum line. So far we ...
user49173's user avatar
  • 159
7 votes
3 answers
2k views

How do I place the seat back 20 cm with a full suspension bike?

Here are 2 ideas for a makeshift design. The first one is no not that good. The second idea seems more doable using 2 heavy duty seatpost attached luggage racks. The seatpost is 33mm diameter, dunno ...
Eric Huelin's user avatar
4 votes
2 answers
2k views

Seat post nominal and actual size

If seatpost has nominal size of lets say 27.2, what is its actual size? Or other way around, if frame nominally accepts post of 27.2 what is the actual size of the bore in the frame? Obviously both ...
Davorin Ruševljan's user avatar

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