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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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
47 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
225 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
257 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
  • 1,006
3 votes
1 answer
124 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
61 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
  • 4,111
8 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
  • 213
4 votes
3 answers
996 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
373 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
  • 1,234
4 votes
2 answers
634 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
138 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
569 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
1k 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
56 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
135 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
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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
12 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
3 votes
2 answers
285 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
512 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
252 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
  • 29.2k
3 votes
2 answers
361 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
  • 29.2k
6 votes
2 answers
481 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 ...
Renaud's user avatar
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1 vote
1 answer
104 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
  • 233
1 vote
2 answers
654 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 ...
user0123456789's user avatar
3 votes
2 answers
715 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
151 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
367 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
149 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
247 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
3k 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
765 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
426 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
787 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
994 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
1k 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
0 votes
1 answer
112 views

seat post bolts won't fasten + spares?

got into a slight accident at home and my saddle has slid off my seat post. It looks like the rear bolt is now bent out of shape and the front bolt won't tighten at all into the nut. I wasn't sure ...
Anonymous Scientist's user avatar
2 votes
1 answer
629 views

How do you tighten a Hope seat post quick release?

I have a couple of these Hope seat post quick release, but I realised I don't know how to tighten it. I am referring to the adjustment on the bolt (not the qr lever).
Andrew Welch's user avatar
  • 2,964
6 votes
4 answers
884 views

Will grooves on seatpost cause rusting inside frame?

My bike has grooves in the seatpost as shown in the picture. The grooves do stop slightly further down the post, but the best saddle height for me is when the grooves partially go down into the seat ...
thosphor's user avatar
  • 511
4 votes
1 answer
395 views

Skipping bolts on seatpost , please help?

Couple weeks back I bought this aluminium single-bolt seatpost . Now, just 20 days later, the nut that tightens the the mechanism to fasten the saddle rails to the seatpost is skipping around and not ...
An Ant's user avatar
  • 322
9 votes
4 answers
2k views

How to make old bike's seatpost slide smoothly when it needs adjustment again?

I've several old bikes with a common problem, the seatpost is a bit too much hard to slide just to adjust the height (sometimes the frame scratch the seatpost), which might be ok on a road bike, but ...
Marras93's user avatar
  • 480
4 votes
2 answers
457 views

How do I fix the comfort of my bike?

On a folding ebike with no suspension what’s the best addition to help with uneven roads bumpy surfaces etc? Whats the best/valued part I could add for comfort please?
kim's user avatar
  • 96

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