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
34 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 ...
2
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1answer
57 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 ...
2
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4answers
96 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, ...
1
vote
1answer
45 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 ...
6
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2answers
127 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 ...
1
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1answer
111 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 '...
14
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4answers
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 ...
6
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3answers
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 ...
4
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2answers
281 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 ...
0
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1answer
59 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 ...
2
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1answer
67 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).
6
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4answers
743 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 ...
4
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1answer
246 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 ...
9
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4answers
1k 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 ...
4
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2answers
443 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?
0
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1answer
62 views

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 ...
5
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1answer
656 views

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 ...
7
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2answers
486 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 ...
0
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1answer
190 views

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 ...
5
votes
2answers
274 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 ...
1
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0answers
49 views

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 ...
5
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2answers
1k 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?
3
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4answers
376 views

What's the better option to buy? [closed]

I am about to get myself a hybrid bike, but being tight on budget (~ 200USD). I didn't really have many options to choose from. I'd initially thought of buying this particular bike, Mach City Munich ...
5
votes
1answer
198 views

Saddle Position

I am a newbie to biking. I got my bike fitted in a local bike shop. I feel comfortable riding it. However, I feel (by looking at it) that the saddle is fitted way too back. It looks as if the back ...
5
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2answers
481 views

Are bike saddles always removable from the saddle post?

I want to buy a mountain bike soon and I’ve been doing a bunch or research. I noticed that some bike saddles can detach from the top of the saddle post, while others get removed with the whole post. ...
2
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1answer
1k views

Is my dropper post too long?

I got a bicycle with a dropper post. As you know, there is currently a bicycle shortage, which is why I ended up getting it online instead of in a local shop (none of which had in stock what I was ...
-1
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1answer
1k views

Canyon Endurace CF SL Disc: 7.0 vs 8.0 [closed]

Mission: On the market for a new road bicycle. Since May 2020 I stepped up my cycling and will probably at least triple the yearly kilometres (3k?). So I want to treat myself and I decided to invest a ...
5
votes
3answers
241 views

Reversible but not symmetrical lower plate in seatpost

I have an old seatpost that was removed from its original bike quite some time ago, now I want to use it in another bike, but I don't know if the lower plate should be positioned so it extends behind ...
4
votes
2answers
1k views

Compatible seatpost for Brooks C13 saddle with 7x9 oval carbon rails?

I just purchased a Brooks C13 saddle (7x9 oval carbon rails, the more recent version with no tape) and was hoping it would fit on my existing post (2016 Jamis Coda Sport - it's a top/bottom clamp with ...
6
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4answers
1k 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 ...
3
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0answers
70 views

Need help understanding the components of a carbon fiber seat tube to properly unseize it

I recently picked up my first carbon fiber bike which has a carbon fiber seat post that seized to the frame due to rust. I did not initially think that was possible but after looking at it, I believe ...
3
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1answer
82 views

Direction of saddle clamps on seatpost

I have a seatpost from a Canyon Dndurace AL 7.0 from 2016. The seatpost has a saddle clamp consisting of two parts. The lower part has one long end and a shorter one. I can rotate both parts of the ...
2
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1answer
114 views

Magura Vyron dropper seatpost internal shaft can be easily twisted

I had a very light crash (in fact just rode into a bush) after which I noticed I twisted magura vyron seat post. Apparently my seat post clamp was too tight.. Now it can be twisted when some force is ...
1
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1answer
319 views

Increasing length of seatpost on a foldable bike

One of my bike is this little Dohiker 14" electric bike, but I actually pedal a lot when riding it, and the seatpost is a bit too short. It is about 50cm long, and I would need a few more centimeters. ...
5
votes
1answer
243 views

Seat rail clamp spins in the seat post

When I last got on my Specialized Stumpjumper the seat wanted to spin freely. The seat post was firmly clamped in the frame. With further inspection the seat is spinning where the seat clamp goes into ...
2
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3answers
179 views

How do I put a lower seat clamp on my Alinker walking aid?

I have a walking aid called an Alinker http://www.thealinker.com/ It looks like a bicycle but it has no pedals and any bike shop can service it. My issue is the seat it's a older style so has 2 ...
1
vote
1answer
185 views

Can I use Danco waterproof grease sold for plumbing and faucets to lube seat posts and pedal threads?

I have this tube of lube lying around, which is good for plumbing fixtures. If this is good enough, I don't have to go out to hunt for bike grease during shelter in place.
3
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0answers
2k views

3 bolt exercise bike saddle adapter in the UK

The saddle currently fitted to my exercise bike is attached to a fixed plate with 3 bolts on it, I can't find any adapters to fit more traditional saddles (rails/posts) that are available in the UK. ...
1
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4answers
539 views

badass-stuck seatpost [duplicate]

I've recently found a nice bike with a steel frame. Well I noticed the aluminium seatpost was stuck but had no idea how heavily. To be honest I never had a similar problem and underestimated that ...
0
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2answers
592 views

What to use on saddle clamp?

I'm purchasing a new seat-post as my saddle refused to stay at the same angle with my current one; it was a second hand bike (B'Twin Triban 500) with a single bolt clamp. I'm going to switch to a two ...
3
votes
1answer
429 views

Very confused about the seatpost clamp

I can't figure the seatpost clamp on my bicycle (maybe it's stuck?). I've had it for a few months, it's quite old. I hit a bump in the street and the force lowered the seat but now I can't figure out ...
2
votes
2answers
1k views

Titanium seatpost in steel seat tube, good idea?

I want to use a titanium seatpost in a frame with a steel seat tube (Columbus Spirit tubes). Is it a good solution? I want to understand if the metals play well from a structural point of view, and I ...
4
votes
1answer
139 views

Seat post shims

I have 3 bikes (2 mtb 1road) all with different seat post diameters. Has anyone used shims. I have 1 favorite saddle. I can buy 2 shims for the fraction of the cost of new saddles. Just switch seat ...
1
vote
0answers
65 views

Thudbuster ST versus Gel-Padded Saddle

I just upgraded from a hybrid to a gravel bicycle (Fuji Jari 2.3). My hybrid (a 2000 Giant Cyprus) had a hydraulic suspension seat post and a generously-padded comfort gel saddle. I have a weakened ...
10
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7answers
3k 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 ...
0
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2answers
390 views

Seat clamp keeps unscrewing, what is the preferred solution?

To prevent stealing of the seat, I replaced my "fast lock" seat clamp with a model using a regular screw: The problem is that the screw keeps unscrewing, and I'm already tightening quite strong. I ...
4
votes
1answer
675 views

Suggestions for protecting jeans from saddle clamp bolt

I’ve got a bike whose seat post uses the traditional style saddle clamp. It works! The saddle is firmly attached to the bike. Hooray. However. This bike is sort of a “café racer” - I mainly pootle ...
4
votes
1answer
553 views

Bolt holding saddle to seatpost broke

I have a saddle somewhat similar to this one. One bolt holding saddle clamp to the seatpost. Some half a year ago I was riding with no hands and leaned back a bit. Suddenly, I fell down the bike on ...
1
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1answer
158 views

Does a seatpost affect the rigidity of the frame?

Is it possible to use a zero offset seatpost to make the bike frame more rigid? I consider the Crank Brothers Cobalt 1 Straight Seatpost.
0
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1answer
62 views

which suspension seatpost for a granny who wants a comfortable ride while cruising the neighborhood [closed]

It is so hard to find info for the granny who just wants some general info for a comfortable ride. I don't need a professional mountainbike seatpost and not worried about if it is carbon or not, don'...