Questions tagged [seatpost]
Questions referring to the part of a bike that extends upward from the seat tube on the frame to the saddle.
227
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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 ...
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13
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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 "...
- 209
4
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3
answers
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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 ...
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2
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3
answers
136
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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 ...
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4
votes
2
answers
620
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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 ...
- 41
6
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1
answer
83
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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 ...
- 161
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2
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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 ...
- 161
3
votes
2
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280
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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 ...
- 155
3
votes
1
answer
53
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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 ...
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3
votes
1
answer
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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 ...
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6
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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 ...
- 3,528
2
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1
answer
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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 ...
- 121
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5
answers
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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 ...
- 340
3
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2
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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 ...
- 514
2
votes
1
answer
291
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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 ...
- 53
2
votes
2
answers
228
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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 ...
- 27k
3
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2
answers
173
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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,...
- 27k
6
votes
2
answers
285
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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 ...
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1
answer
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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 ...
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2
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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 ...
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3
answers
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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 ...
- 491
2
votes
1
answer
430
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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 ...
- 157
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2
answers
614
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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&...
- 39
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0
answers
124
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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 ...
- 11
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vote
1
answer
175
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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 ...
- 11
3
votes
3
answers
1k
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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 ...
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5
votes
1
answer
776
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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 ...
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4
votes
1
answer
127
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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 ...
- 41
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0
answers
197
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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 ...
- 11
2
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1
answer
2k
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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 ...
- 1,783
2
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4
answers
387
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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, ...
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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 ...
- 27
6
votes
2
answers
418
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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 ...
- 61
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1
answer
458
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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 '...
14
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4
answers
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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 ...
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3
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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 ...
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votes
2
answers
854
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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 ...
- 2,203
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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 ...
2
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1
answer
430
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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).
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4
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846
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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 ...
- 511
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1
answer
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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 ...
- 322
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4
answers
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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 ...
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2
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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?
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25.4-27.2mm seat post shim on a seat tube with 26.8mm inner diameter
From where I live (Philippines) , there seems to be no stock for 26.8mm seat posts. All other sizes are available except for 26.8mm; they don't even sell shims for that size. Currently I am forced to ...
- 113
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1
answer
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Bike seat tube is messed up
I was testing my seat and as I was sitting on the bike on the highest level of the seat post.
My seat post came off and bent my seat post, so I ordered another, but now my seat tube doesn't allow my ...
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7
votes
2
answers
660
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Before re-inserting a stuck seat post what should I do to the steel/alloy surfaces?
After several days and great effort I've succeeded in removing a stuck seat post (alloy post in a steel frame). It's actually in a reusable condition.
Before trying to re-insert it, what should I do ...
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1
answer
470
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Seatpost clamp arrow and too wide saddle rails
I have two questions in one: :)
The first would be what direction does this arrow on the seatpost's top clamp indicate? Is it towards the front or rear of the bike?
Second would be what should I do if ...
- 241
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votes
3
answers
869
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Seat post bolt sheared off - twice
I use a BMC TM02 on CycleOps Magnus. The seat bolt has sheared off twice while riding on the trainer.
The seat is attached to the post by a single stainless steel bolt. KSFC 12.9 appears on the head ...
- 215
1
vote
0
answers
158
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Size of clamp for Fizik Vento Argo R1 saddle on Specialized CG-R seat post
I have a 2015 Specialized Roubaix SL4 Disc with a CG-R seatpost, and recently bought a Fizik Vento Argo R1 short-nose saddle for it.
Knowing it has ovalised carbon rails and not the standard 7 mm ...
- 143
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3
answers
2k
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Why the small difference between common sizes of handlebars (31.8mm) and MTB seatposts (31.6mm)?
Many handlebars have a 31.8mm clamp section, and a common MTB seatpost size is 31.6mm.
I know these are both around 1 1/4 inches. Why the 0.2mm difference though?
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