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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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24 votes
5 answers
65k views

How do I keep my seat from tilting back?

When I first got this bike, I got the saddle adjusted almost perfectly. Recently it slipped back (so that the nose sticks up). I loosened the bolt under the saddle, tilted the saddle back into the ...
freiheit's user avatar
  • 19k
22 votes
5 answers
76k views

What makes grease appropriate for bikes?

I'd like to grease my seatpost, and in front of me I've got a tube of "CMD Extreme Pressure Lube #3" that claims to be good for "ball bearings, roller bearings, deep drawing, rivet spinning" and a ...
Thalecress's user avatar
19 votes
3 answers
36k views

Should I oil my seat post?

In a previous question I asked how to remove rust from my seat tube/post. In the comments of one answer somebody said I should be oiling my seat post to prevent it from rusting into my seat tube, but ...
user229044's user avatar
  • 3,606
16 votes
10 answers
14k views

Removing Seat Post rusted into downtube

I have an old steel frame (Columbus Number 2 I think) that has the seat post (Suntour Superbe Pro - see, I said it was old!) rusted in. I have tried lots of WD-40 but it will not budge. Any tips on ...
Anthony K's user avatar
  • 6,233
16 votes
6 answers
44k views

Should I grease a carbon fiber seat post?

I was reading a recent question when I saw this answer: You should absolutely grease your seatpost (unless it is carbon fiber). Why should I NOT grease a carbon fiber seat post?
Anthony K's user avatar
  • 6,233
15 votes
3 answers
4k views

Why do some triathlon seatposts go straight up and down instead of at an angle?

Why is it that some triathlon bikes have a seat post that adjusts straight up and down instead of the more standard axis that aims at the bottom bracket? This means that if you raise (or lower) the ...
PositiveK's user avatar
  • 1,111
15 votes
5 answers
87k views

Is it worth getting a suspension seat post as a cheap alternative to full suspension bike?

I'm planning a ride from Birmingham to London on the Grand Union Canal (UK), which will be quite bumpy for most of the 145 mile distance. I have a front suspension bike and can't afford a new full ...
Mick Sear's user avatar
  • 479
14 votes
8 answers
3k 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
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
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
  • 587
14 votes
2 answers
16k views

How to adjust seat saddle and saddle position for knee pain?

I understand that a seat too high can cause: hips rocking trying to extend to pedals pain in the back of the knee And that a seat too low can cause: can't fully extend legs pain in front of the ...
mark's user avatar
  • 357
13 votes
2 answers
6k views

What are the differences between a seatpost-mounted and frame-mounted rear rack

I am in the market for a rear rack. I noticed that there are two categories of rear racks: Seatpost-mounted rear racks, such as this one: And frame-mounted rear racks, such as this one: I'm ...
Cave Johnson's user avatar
13 votes
3 answers
19k views

Safely cutting down a seatpost

I want to shorten my seatpost it fouls the non-OEM kickstand on my folding bike when lowered. What is the best way to cut a (33.9mm alu) seatpost? Can I just use a rotary plumbing pipe cutter? The ...
RoboKaren's user avatar
  • 29.2k
13 votes
7 answers
18k views

Which way should a seat post clamp be oriented?

I heard somewhere (I don't remember where) once that a seat post clamp should be oriented with the gap at the front of the seat tube, opposite of the gap in the top of the seat tube. The logic behind ...
jimchristie's user avatar
  • 11.8k
13 votes
4 answers
17k views

Metal seat post with carbon fiber frame?

Is using a metal seat post on a carbon fiber frame advisable or not? I want to use a seat post mounted rack on my road bike (no regular rack mount points are on this bike), but I have been told that ...
rsecca's user avatar
  • 373
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
  • 3,991
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
11 votes
3 answers
18k views

Benefits and drawbacks of Dropper posts?

From what I've seen, the last couple of years saw a new product type come into light, and since its inception it has started to appear on bikes (such as this one, this one, or this one) as a stock ...
Saxman's user avatar
  • 708
11 votes
2 answers
3k views

Is a seat post with an integrated pump a good idea?

I saw this http://www.premiumbikegear.com/biologic/convenience/postpump-seatpost.html and thought it seemed like a cool idea. But if it was really such a great idea, I would have expected to see more ...
Rob Donnelly's user avatar
10 votes
7 answers
4k views

How to stabilise the bicycle seatpost and saddle when it is all the way up?

It is a standard column bicycle seat and I realised maybe I should have it raised to top (I can still stand the bicycle up using my toes) but the saddle rocks as there is no column to stop it moving ...
user2617804's user avatar
10 votes
5 answers
2k views

Is there more than one ideal seat post height based on type of riding?

Assuming one has the correct frame size for one's height, can there be more than one perfect seat post height for the type of riding? I usually ride only in the city with traffic and less than 3 miles ...
nolawi's user avatar
  • 1,290
10 votes
3 answers
1k views

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 ...
user1757436's user avatar
9 votes
4 answers
3k 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
9 votes
2 answers
33k views

Is it possible to compensate a short sized frame by adjusting seatpost and stem?

Could you achieve the same position you would have on a bigger frame by raising seatpost and stem? And how could I adjust those to "simulate" a bigger sized frame?
Vital V's user avatar
  • 357
9 votes
3 answers
2k views

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?
MaplePanda's user avatar
  • 15.6k
9 votes
4 answers
7k views

How do I remove rust from my seat tube?

I just pulled my seat out as the first step of breaking my bike down for winter storage, and found that rust has formed between my seat tube and my seat post. The rust starts maybe 3" down the tube ...
user229044's user avatar
  • 3,606
8 votes
12 answers
28k views

Aluminum seatpost stuck to a steel frame

I'm trying to free my aluminum seatpost corroded to a CrMo frame. One of the methods is to heat the aluminum seatpost and then to let it cool. In theory, the aluminum will expand twice as fast as ...
Jacob's user avatar
  • 349
8 votes
7 answers
16k views

Problems with a slipping seatpost

I got a Cannondale Quick1 2010, with the seatpost made with aluminium carbon-wrapped. The problem is that the seatpost tends to slide downwards, even if I squeeze a lot the snap ring; if the ground ...
Sam Qasbah's user avatar
8 votes
1 answer
596 views

How to judge comfort when buying a new saddle

I bought a Motobecane Mirage S recently from bikesdirect.com I took the following advice from a bikes forum: Plan on changing the seat, pedals, and possibly the tires. The seat will make your ...
maxwell's user avatar
  • 283
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
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
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
  • 21.6k
7 votes
6 answers
5k views

Remove lubricant from seat tube and seat post

I recently bought a second hand bike. It rides pretty well, the only nuisance I have is that the previous owner has spread some lubricant on the seat post. I am pretty sure of this because I see on ...
L.Dutch's user avatar
  • 7,131
7 votes
1 answer
2k views

Cracked seat post

Just been cleaning my Canondale CAAD8 and noticed these cracks in the seat post - they look like cracks in some kind of outer covering and wondering if someone can tell me how much of a problem they ...
Mr_Thyroid's user avatar
7 votes
2 answers
894 views

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 ...
Jeremy Boden's user avatar
7 votes
3 answers
4k views

Does anyone make a split seat clamp?

I built an 'Urban Mountain Bike' and I sometimes like to take it off drops. Accordingly, I cut the 'nub' that sticks up above the top tube so that the seat can be removed without a scary open pipe ...
Ehryk's user avatar
  • 3,973
7 votes
3 answers
2k views

Should I worry about rain getting inside my frame?

I commute to work every day and lock my bike on the street. I have a nice saddle so I remove my seat post and take it into work with me. This obviously leaves a hole open to the inside of the ...
Ben's user avatar
  • 663
6 votes
4 answers
910 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
  • 510
6 votes
1 answer
3k views

Bike comes with frame integrated bolt seatpost clamp - can I cut it off and use QR?

I've got a Marin Pine Mountain 1 2016 - it comes with a frame integrated bolt seatpost clamp. Is it possible to cut this off and use a QR seatpost clamp instead? Bike : Seat Clamp :
Andrew Welch's user avatar
  • 2,954
6 votes
2 answers
876 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
  • 20.6k
6 votes
4 answers
8k views

Does seat post suspension reduce efficiency?

I have a hybrid bike with front and seat post suspension. It's easy to see how front suspension reduces pedaling efficiency by using some of the power for compressing the shocks, so I keep it locked ...
Imre's user avatar
  • 275
6 votes
5 answers
39k views

What type of grease to prevent seat post sticking?

What type of grease should I buy specifically to prevent the seat post from getting stuck in the seat tube? I believe its aluminum. Is there all-purpose grease that I can use for other parts of the ...
Rosalie Molloy's user avatar
6 votes
3 answers
9k views

What are the benefits of a carbon seatpost?

As the title states, what are the benefits of a carbon seatpost like this one from MEC? My research indicates there may be the following pros and cons: Pros Lighter Supposedly smoother ride Cons ...
Soo Wei Tan's user avatar
6 votes
4 answers
21k views

Getting the right cockpit position. Sliding forward. What should I adjust to keep my sit bones on the seat?

I am experienced rider and I'm looking for some advice on how to adjust my cockpit position. I am a daily commuter, and do regular 40-50k rides on the weekends, and with the warmer weather will work ...
Doug D.'s user avatar
  • 86
6 votes
4 answers
5k views

What do I need to change to avoid 'bouncing' in my bike seat at high RPM?

I've noticed while cycling on my road bike that, when I try to pedal very quickly, I start to 'bounce' a little in my seat. As in I'm lifting off the seat a little with each pedal, so feel I'm not ...
Eleanor Sims's user avatar
6 votes
1 answer
183 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
6 votes
1 answer
578 views

'Micro adjust' saddle clamp not allowing fine enough adjustment (on SP12 suspension seatpost)

I have an Suntour SP12 seatpost, and the saddle is held on by two clamps on either side. The clamps are splined, but these splines only allow adjustment of around 6-8 degrees which is far too much ...
Tom's user avatar
  • 61
6 votes
3 answers
937 views

Seatpost of a folding bike is always dirty, filed down by frame?

I fold and unfold my Dahon Speed D7 at least four times a day, and each time its seatpost is being pulled up or pushed down the frame tube. Problem is that the seatpost becomes dirty really quickly ...
Yuriy's user avatar
  • 791
6 votes
2 answers
1k 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
6 votes
2 answers
8k views

Is there a gadget that will let me slide my seat forward more than my post allows?

So I'm I'm trying to dial in the fit on my road bike to be more tri-bike like, and in doing so, I'd like to move my seat forward, well, more than I currently can. I have the Redshift seatpost, and I ...
CJ F's user avatar
  • 233

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