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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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0answers
74 views

Seat clamp slid the seat down as I was riding, hurt my knees

So I was riding a community shared bicycle that many city's have that you can ride around for a small fee. While I was riding it, the seat clamp must have been loose and the seat was sliding down ...
4
votes
2answers
321 views

How to access seat-post lever on the handlebar?

I would like to change the position of my seat-post lever but in order to do so, I have to untighten its screw. The problem is that I can't manage to access the screw, due to the presence of the hard ...
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0answers
43 views

Any 36.4mm Dropper Seatposts?

I've a diameter of 36.4mm, are there any dropper seat posts that make the size diameter for my bike?
1
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1answer
64 views

Is there a non-proprietary standard for oval seat-tube/post?

I see Pinarello Dogma and Gan S frames have a proprietary seatpost/seattube combination, which don't have a circular section. An advantage of that design in my opinion is that it's impossible to have ...
2
votes
1answer
118 views

How do I lower the saddle on a Scirocco bicycle?

I've acquired a second-hand ladies' Scirocco Elegance 21 speed bicycle. I need to lower the saddle but can't quite see how it can be done.
1
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0answers
46 views

upgrade traditional saddle clamp (not seat tube clamp)?

I'm currently restoring my folding bike and it has a large diameter (34 mm/1.34 in) seatpost that tapers to the standard 22 mm/0.87 in diameter at the end. The bike currently uses that traditional ...
2
votes
1answer
74 views

Fitting a saddle with non-round rails to a Stevens Arcalis

What options are there to change the saddle mount on an aero seatpost of an Stevens Arcalis 2017 to mount a saddle with non-round carbon rails? Below you can see the saddle mount that is designed to ...
3
votes
2answers
403 views

Suitable bicycle grease for aluminium and steel materials?

I hope you enjoy your day. A few days after of using my bike I have some troubling feeling about it. I can hear a cracking sound or something similar, and on the internet I found out the cause. I ...
3
votes
1answer
128 views

Can I remove dropper seatpost of the Lapierre Edge 327 plus?

I recently bought a Lapierre Edge 327 plus mountain bike, that has a dropper seatpost that can be adjusted from the left handlebar. I want to remove the seatpost when I park the bike in "unsure" ...
4
votes
1answer
380 views

Is it possible and safe to attach this type of seat to suspension seatpost?

I have a Merida Crossway 20 bike, and want to change its saddle. Now after buying a new one I am not sure it is even possible to mount it. I had forgotten I have a suspension seatpost, but the new ...
9
votes
2answers
891 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 ...
2
votes
1answer
660 views

How to change the seat clamp on a dropper post?

While trying to tighten the screws on the seat clamp on my wife's bike, I overtightened one of the screws, damaging both the screw and the seat clamp. (I had used a torque wrench and had set it to the ...
7
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1answer
2k 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 :
2
votes
2answers
305 views

Increase saddle height

I tried the Xiaomi qicycle electric folding bike and I really liked it. The only problem is its size. I already know how to raise the handlebar, but I'm not sure how to raise the seat. It should be ...
3
votes
2answers
155 views

How to repair / create a CF seat post clamp interface?

I have a carbon Trek Madone 4.7 road frame with a nonexistent clamp interface. At the top of the seat tube, there should be a smaller-radius section of notched aluminum on which to place a clamp. That ...
5
votes
2answers
107 views

Pannier rack for larger diameter seat post

I have recently purchased an old, second-hand folding (or at least collapsable) bike, a Daewoo shuttle to be precise. In order to use it for commuting, I would like to fit a pannier rack onto it. It ...
0
votes
1answer
188 views

How to remove alu seat post from carbon frame?

My aluminium seat post is seized into my carbon frame. To make matters worse the seat post is snapped at the seat post collar - nasty crash. Anyone have a way to get it out? Or is it time for the ...
2
votes
1answer
2k views

Oval carbon saddle rails compatibility

I have a new saddle and I want to buy a compatible seatpost. The saddle rails is CARBON 7x9 as specified by the manifacturer. I want to understand better the compatibility of this kind of oval rails. ...
8
votes
6answers
2k 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 ...
2
votes
1answer
71 views

“261E” seat tube on an old bike frame

I've bought an old second hand bike frame and I'm trying to build it up into a road bike. Things have been going quite well, but I've got a bit confused by the seat tube. At the top of the seat tube ...
2
votes
2answers
132 views

Seat Post Binder - Fuji CF1 - circa 2008

I'm looking for a replacement seat binder for a 2008 Fuji Aloha CF1 - The one I had cracked and will no longer work. I have contacted Fuji but they politely laughed at us! Most shops looked through ...
1
vote
1answer
69 views

Titanium fork in a chromoly frame

I have heard there can be issues when dissimilar metals are in prolonged contact. Would that apply to titanium and chromoly? Ive got may eye on a new titanium fork for my old chromoly frame bike.
6
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3answers
1k views

Seat post slipping down

It looks like my saddle/seatpost is slowly sliding down into the frame, so every 2–3 months I have to move it up by 1–2cm. Yet I tighten the clamp pretty tight, so I can't move the saddle ...
1
vote
1answer
1k views

How do I figure out the right size seat post for my bicycle?

I found a discarded Mongoose Alta frame with no seat post or seat that I want to refurbish. How do I find out what size or type of seat post and seat I should get as suitable replacements?
1
vote
2answers
859 views

Is my 2017 Trek Fuel EX 5 Stealth internally routed dropper seatpost compatible?

I have got a 2017 Trek Fuel EX 5. After Christmas I may be upgrading it with a dropper seatpost. I would like to know if it is compatible with an internally routed dropper seatpost.
2
votes
2answers
334 views

Will 0.5mm gap/play in a seatpost shim work without cracking the seatpost tube?

I have a Day 6 ebike; it's a large frame--the Samson model. The seat post (the frame member) is 31.4325mm or 1.2375 inches (I.D.) at the clamp collar. The seatpost (the seat support post) is likewise ...
2
votes
1answer
85 views

Baby seat for stoker's seat post on tandem

My wife and I used to both commute by bike, and now that our child is old enough to go on a bike, we'd like to do so again. She has already installed a front-mounted baby seat on her dutch-style bike, ...
1
vote
1answer
218 views

seat tube deformed, is it dangerous?

I just bought a 2nd hand salsa El Mariachi frame, that I will start to build this week. Unfortunately when I received it I realized that the previous owner probably has ridden it with the seatpost too ...
0
votes
3answers
184 views

Brake hanger causing seatpost slippage?

I have an aluminum seatpost in a steel seat tube and I have been noticing some slippage lately. The size of the seatpost and of the seat collar match perfectly the size of the frame. I inspected the ...
0
votes
2answers
1k views

Clicking/cracking noise while seated

My initial suspicion was that the clicking/cracking noise my bike makes was coming from my bottom bracket. But today, I noticed that when applying full power while standing up, no clicks are present. ...
2
votes
2answers
2k views

Advantages with longer seatpost in the seat tube?

I am about to buy a new seatpost and I am wondering what's the ideal length. The one I have now is 33cm long, even though it only sticks out of 10cm from the frame (measured from the seat collar to ...
3
votes
1answer
2k views

What's this torque specification on the seatpost for?

I read 12Nm torque on my seatpost (a Cinelli Vai seatpost). What does this torque refer to? I would assume it's for the two bolts above that tie the saddle rail to the seatpost, but at the same ...
0
votes
1answer
229 views

Require seatpost size of Dahon Vitesse D7

I have a Dahon Vitesse D7.. Have lost the seat post. Can you let me know what is the size of the seatpost will fit to the mentioned model
5
votes
5answers
4k 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 ...
3
votes
3answers
188 views

Getting the right seat post

I'm currently rebuilding an old steel frame. After measuring it I was sure it'd take a 27.2mm seat post (see picture) so that's what i bought. Sadly it doesn't fit (despite some "encouragement" with a ...
7
votes
1answer
799 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 ...
5
votes
3answers
2k views

Saddle height for toddler's balance bike

My toddler (two and a half years old) has just started scooting around on her balance bike. I'd like to ensure that the saddle is at the best height for her to learn to balance. I know the rules of ...
5
votes
1answer
2k views

Are seatpost shims safe to use - for the frame, seatpost, and the rider?

Are seatpost shims safe to use from the perspective of the frame, seatpost, and the rider? My concern is that seatpost shims only support the seatpost for a few centimeters - while a properly ...
0
votes
1answer
178 views

Why do we sit on saddles that rest on seatposts? (and not on seats that rest on saddleposts)

Why do we call bicycle seats saddles and why is it a seatpost not a saddlepost? Asking for a friend.
3
votes
2answers
350 views

19 inch frame MTB Issues for a guy standing 6 feet 3 inches tall

maybe a noob question. I bought a 19 inch frame Hardtail MTB. I mostly ride for fitness and leisure. Have done some commutes as well. I faced some issues while riding long. I started having pains in ...
12
votes
3answers
5k 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 ...
0
votes
1answer
425 views

Replacement parts for Trek 7.3

My bicycle was stripped of parts (both wheels, seat post and saddle) outside my house and I'd like to replace them myself as the shop is looking for a huge sum of money to do it. This isn't the ...
5
votes
2answers
1k views

carbon seat post to carbon seat tube - necessary to loosen periodically to prevent seizing in place?

I recently (about 4 months ago) purchased a bike with a carbon frame (i.e. carbon seat tube) and a carbon seat post. I've read some nightmare stories about having to replace an entire carbon frame in ...
2
votes
1answer
172 views

Correct sitting posture for my bicycle

I recently bought the below bicycle 26 inch https://www.trackandtrail.in/cycles/mach-city/ibike-7-speed/ My Height is 5:11, after riding for one week i started feeling pain at upper back below ...
1
vote
1answer
382 views

Using 27.2 seatpost in 26.8 frame

I'm building a bicycle for myself on a steel road frame using primarily used and salvaged parts. I measured the inner diameter of the seat tube to be 26.8mm but I only have on hand a 27.2 seat post. ...
0
votes
2answers
1k views

Seatpost clamp sizing issues?

I have a carbon bike frame that has a seat post with diameter of 31.6mm and i got a clamp that said 34.9mm but it doesn't fit on the frame (too small). There is no manufacturer details outside of the ...
4
votes
4answers
948 views

Single bolt seat clamp slipping

I've got a Kindshock Dropzone seatpost with a single bolt clamp. Even if I screw the bolt in hard the saddle will always slide to the back. Any way to prevent it? It's pretty annoying.
1
vote
2answers
491 views

Seat shim dimensions for Brompton

I have seen a great seatpost online that i would like to fit to my brompton. The only trouble is that the OD is 31.6mm instead of 31.8mm. The Brompton seat mechanism uses a plastic shim to help the ...
0
votes
1answer
291 views

Can I use a seat-post clamp/collar on the seat-post itself to prevent slipping?

I have a Cannondale Synapse (2015 model), and have swapped the stock Cannondale seat-post for a Thomson Elite inline seat-post. However, I am experiencing problems with the seatpost slipping, even ...
2
votes
2answers
688 views

Dual water bottle brackets on a single frame mount?

I'm looking for a way to mount two water bottle cages on the seat tube. Is there any way to make this hold two water bottle cages on one bracket / mount point?