Brompton Carbon Seatpost - New for 2023

[@nikos.asproudis]

"sorry box, sorry tree" best quote of the year ;-) 😋

[@brilliantbikes]

Many thanks! And thank you for watching!

[@hikingout2988]

While the weight savings of a seat post might interest some, I would not recommend carbon as a material for seat posts that require frequent adjustments as is often the case with folding bikes. The reason is that carbon fittings are quite fragile and often require a torque wrench to properly tighten the fitting. If it's too loose the post may slip and if too tight, the post may crack. If one wishes to save some weight and ditch the often rusty Brompton stock seat post, I think a better option is to find a quality aluminium or titanium one.

[@napilopez]

Keep in mind that this carbon seatpost has a steel layer on the outside in order to mitigate the usual problems with carbon. There's nothing else like it on the market, as far as I know, so the jury is still out on how it holds up. Still, I've heard of several aftermarket titanium seatposts warping or even breaking, so I rather think you'd be safer with the Brompton-designed seatpost that's actually been tested properly for use with the bike. It is the one that comes with the T line, after all.

[@GrahamAtDesk]

​@@napilopez I'd like to think that "Brompton-designed" would cover it, but I had one of Brompton's own Ti seat posts. I posted a comment elsewhere in this thread, but tl;dr - it eventually snapped, I consider myself lucky to have survived

[@finncarlbomholtsrensen1188]

I have used a Chinese carbon post, which wasn't the same size all along, but presently I use a Chinese, black titanium Post, which are of high quality, even if not a Brand. It is easy to feel the quality as a weight and the thickness of walls! Chinese Brand names also have a reputation to protect and are often of a high quality as well, and less expensive, I suppose, than the originals? Finn. Denmark 😄

[@NoZenith]

😮oh NOOOOOO! I've done enough research since I bought my bike a couple of years ago trying to figure out which seat post I wanted to go for (Standard is just a bit too short for me, so why not upgrade and lose a few lbs at the same time?) I have been following this seat post specifically to see if it suffered from possible fracture and the horror stories online like the aftermarket carbon when it breaks when you don't expect it, the fall or it gets stabbed in your leg or catastrophic failure happens in traffic (I understand it almost always happens on uneven surface, not smooth bike paths 'cause it usually takes a shock to make it collapse). I hope you had no injuries and at least walked away. ​@GrahamAtDesk

[@NoZenith]

​@@finncarlbomholtsrensen1188Specifically which brand did you get? I have done a ton of surface level research and I have heard anecdotal evidence that some brands are too light guage/ thin and fail/ buckle over. Many advertisements don't say anything about the thickness of the pipe wall. I'm trying to find something really good quality cause. I should never have to replace it But I also want it really lightweight and just slightly longer than the original. I'm still considering getting one with the reduced top end, keep the original seat, or whether I should go for something a little more standardized

[@GrahamAtDesk]

I bought one of Brompton's titanium seat posts, back in around 2006. In 2019 it snapped in half while I was riding along a busy main road, and I nearly finished up under a bus. Luckily the driver was paying attention, but I still smashed my cheek bone into the tarmac at quite a lick. That experience made it very apparent to me just how important it is that a Brompton's seat post doesn't fail while you're riding. If a post fails on a diamond frame, you'll drop 6 inches and then the frame will take your weight again. I can imagine that a loss of control and a crash could be averted. With a Brompton, as your weight is thrown back extremely far (and low) you pull an immediate involuntary wheelie, and keel over to one side very very quickly. In other words, you totally lose control. It felt like the frame had snapped in two. So the key thing for me, for a Brompton seat post, is to have a material that will fail slowly and predictably. On inspection, my ti post had clearly cracked across the front half, and then the rear half of the tube failed rapidly, essentially without warning. I think steel would bend more slowly, giving the rider warning. Carbon, I suspect, would fail even more catastrophically than my ti post did (see bustedcarbon.com). Sorry for the downer of a comment (I love your channel), but I think this experience is worth sharing. I asked Brompton to issue a recall on those ti posts, but they refused, saying "in normal use, the risk of titanium fatigue failure is remote, even after many thousands of miles, but the risk of failure increases with use, especially with hard riding or severe loading" and "…this is due to normal wearing and fatigue of the components so, we can't organise a recall". They also said "I understand your concern about the seatpost, we know some riders have experienced the same type of issues with their bikes", so the reason for refusing a recall didn't sit well with me. I feel we can say (in retrospect) that ti was an inappropriate choice for a seat post, and that's a good reason for a recall. They also said "Many components on a bike are highly stressed, and with high mileage, heavy loads or hard riding, will eventually reach the end of their design life; in particular, aluminium, titanium, and alloy have a limited fatigue life." It's a fair point, and it's why I prefer steel for safety-critical components.

[@brilliantbikes]

Many thanks for watching! Titanium seat posts were out a long time ago, I never saw one. I trust Brompton have developed and tested this rigorously.

[@A392Hz]

Because this carbon seatpost comes with 0.3 mm steel on the surface, I am hoping that it will help with rigidity. I've been using this for more than a month and it's been great so far, but I hope this will last.

[@finncarlbomholtsrensen1188]

As a Dane and owning the former, Top 2019 SuperlightM6LXBrompton, I have found the most obvious solution for a lighter seat post, and many other parts from titanium and carbon! Of course: China! My bike with mudguards and a lot of added extra titanium and carbon parts for now weighs 9 kilo (with mudguards and still falling, as I use an original handlebar and haven't changed many parts, which I have ready. Even a set ceramic balls for my stem post!)! I use a Chinese, originally Brompton shaped, Titanium seat post (black) with a very thick sidewall, and it feels very sturdy! They are sold in several length versions, also in between the originals as well as an extra short! And prices are, about the prices for an original post, I suppose? Finn. Denmark 😄

[@matztertaler2777]

Thats why carbon has no place at bikes. All MTB breakings at the trail are carbon frames or seatposts.

[@NoZenith]

​@@finncarlbomholtsrensen1188what brand seatpost did you go for?

[@brightlightdun]

❤ Love the Brompton 🌳 tree . It always did the hardest work 😅

[@brilliantbikes]

It was lovely for the shade the other day! Thanks for watching!

[@ThePensionerAdventurer]

Hello Guy's, Sounds like we are in the same club with standard size legs - lol... As always thanks for making us all aware of what is available for our Brompton's. Take care. Paul,,

[@brilliantbikes]

Many thanks for watching up again 😀

[@finncarlbomholtsrensen1188]

In my home, Denmark, all Brompton are delivered with an extra length post as Standard, as we are generally tall persons. And of course this adds to the load on the post. Finn. Denmark

[@IainM-b5j]

Great simple instructive video, even although I probably won't fit a lighter seatpost, it's good to see how to remove and install 👍

[@brilliantbikes]

Many thanks!

[@meliorknowledge7590]

Loved the out-takes!

[@brilliantbikes]

Thanks for watching!

[@devjon123]

I fitted an aftermarket Titanium seatpost shortly after getting my 2019 chpt3. When the postie handed me the package I thought I'd been ripped of as the box felt empty! Really happy with it, though I did add back some weight by fitting mudguards from the excellent Brommiemods.

[@finncarlbomholtsrensen1188]

As an owner of a 2019 Superlight, with original mudguards (I'm a Rainy Dane) I have also bought Chinese Titanium posts and I admit, I thought they felt heavy, but they weighed as promised from the the seller in China! And of course less than an original post! And they come in several length versions, also in between the original. Finn. Denmark

[@carstennielsen9099]

Please tell your viewers to mark where the saddle was situated to spare them the hassel adjusting afterwards. Regards Carsten And keep up your fine videos.

[@brilliantbikes]

Thanks for the comment and for watching!

[@ssurplus3549]

I like how you are using mtb products like intense and commencal thermal flask 😊🤙

[@brilliantbikes]

You were watching closely! Some of our favourite bike brands! 😀. Thanks for watching!

[@MrRolandMichel]

Hi Hannah! Wondering what your thoughts are on a Carbon handlebar? I've been considering one, but I'm reluctant given the more fragile nature of the material and the need to fold and transport the Brompton in a case when flying internationally. Thanks for your time, and all the wonderfully informative videos.

[@brilliantbikes]

I have carbon handlebars on my mountain bike, but it’s good quality. So I’d be happy with a good quality set. Thanks for watching!

[@lotuselise4432]

The joys of the penta clip when all the bits fall on the floor and you need to put it back together again, a Rubik's Cube can be done faster.......

[@brilliantbikes]

Oh yes they are fun when they ping! Thanks for watching!

[@frankhooper7871]

Even more fun is when you can't find one of the bits (eventually located)

[@john-r-edge]

I always thought that the Pentaclip is a piece of modern art which accidentally escaped from the Gallery.

[@albertmeyer8983]

Ha ha ha ha

[@finncarlbomholtsrensen1188]

@@john-r-edge I took my original Pentaclip apart to replace the original bolt with one from Titanium! I found it - absurdly complicated, and soon ordered a new Clip with a ring and "wedges" for adjustment and less weight! If wanting to sawe extra weight a Titanium post with a built in ring is to be found also. But then without any theft security and being able to be removed from the top! Finn. Denmark

[@anthonylloyd6094]

Another cool video. Sorry for the non related question, but where did you get tha bag that dits in the frame?

[@brilliantbikes]

Many thanks for watching! The bag come with the CHPT3 V4 released earlier this year

[@anthonylloyd6094]

@@brilliantbikes hopefully it'll be available as aftermarket.....

[@NoZenith]

Thank you very much. I was growing for the comments for exactly this question and response! I. Also hope it comes out as an aftermarket. there are plastic ones that are made by third party that pop in and I saw another one that was a zipper bag. But this one looks interesting with that little flap on top... Like maybe you can pivot it out for quick access to dump or get out a phone/ wallet without actually unstrapping it for easy access ​@@anthonylloyd6094

[@Noemanumen]

„I don’t want to damage the box for some reason“ - goes on to throw box off the screen 😂😂❤

[@brilliantbikes]

It’s such a nice box! I just did not want to damage it…. Oh well! The hanks for watching!

[@kentwydell9322]

Thanks for another lovely video. Any idea how much and when it will be available? BTW the 'be seen' light set that was the subject of a recent video has still not appeared on either the Brompton or Brilliant websites

[@brilliantbikes]

They are available already, link as follows: brilliantbikes.co.uk/brompton-handlebars-and-seat-posts/5967-brompton-superlight-seatpost-carbon-standard-length.html

[@devjon123]

@@brilliantbikes Oh my giddy aunt 😮£160 to save 90 grammes. I'd reconciled myself to the fact that Titanium on a Brommie costs about £1 per gramme of weight saved, that's a lot more costly. I've read that Carbon handlebars and stems can take out some of the road buzz, would the thin steel shell covering the carbon negate this?

[@johnlaw3323]

What is the reason for the two O rings? Will the carbon seat post show scratching with the up and down of folding? Great vlogs as always many thanks.

[@brilliantbikes]

We had two prongs on the standard seat post, it give a bit more rubber between the frame and Pentaclip. They are also supplied as packs of two from Brompton

[@cmiller332]

Thanks for the vid. Any plans for a telescopic version?

[@brilliantbikes]

We are aiming to find out! Thanks for watching!

[@Wysiwig99]

Love your vids. Have you done one on transport bags in which you can fit the folded bike? Have a hard time finding a proper one for my brand new C-Line.

[@simkaur1227]

The dimpa bag from Ikea is pretty decent! Saw it in another video by the happy European lady who cycles!

[@Wysiwig99]

@@simkaur1227 Thank you. Will check it ou!

[@brilliantbikes]

Many thanks for watching. We have done some videos on the Transit travel bag from Brompton and the Foldon cases when we did a travelling video.

[@jcblum1507]

😍

[@brilliantbikes]

Many thanks for watching!

[@nicekit]

Hi H ... u didnt show us the extended weight ... :D How does it compare with other after market carbon seatpost? because other after market carbon seatpost require to change to rubber insert on the clamp area

[@brilliantbikes]

The Brompton extended Carson seat post is 310g. Sorry I have not compared to other options Thanks for watching

[@fossil9559]

What is the purpose of the two O rings ?

[@brilliantbikes]

They stop the pentaclip from banging down onto the top of the frame (and potentially chipping the paint)

[@Paul___L]

I'd be interested if it reduced a bit of the flex over the weight saving. When going hard on a brompton the whole things flexs like a slinky.

[@KavanOBrien]

I see you’re branching out today , what’s the reason for two o rings on the post ? I did hear the P -Line have changed the wheels from the ones they started with to ones the use for their other version, is this correct and if so why, I know it’s all about the song = Poster Girl = Zara Larsson.

[@brilliantbikes]

Brompton changed the rim not the hub or spokes. Two O rings it give more height to protect the frame from the Pentaclip. Thanks for watching!

[@KavanOBrien]

@@brilliantbikes why did they change the rim ? Was it not good ? It was also on the T-Line was it not ? So did they also change it on that one ? Sounds like the deerstalker and pipe needs to make an appearance , things are a foot one thinks, elementary my dear Hannah.

[@byronb8711]

Is the outside of the post still steel?

[@brilliantbikes]

Yes it has a thin layer on the outside of the carbon

[@musiqsoundsproductions]

I just got one, but feel a bit scared at its full length going over bumps. And im fairly light with 82kg So I might sell it.

[@brilliantbikes]

Thanks for watching! Sorry far not heard of any failures. So fingers crossed!

[@bobwilliamson5574]

I didn't know there was a carbon seat post , and i went to all the trouble of drilling 3000 holes 6 mm diameter holes in my alloy seat post and it made bugger all difference. Thanks for the info now I'm off to the shop to buy a new carbon post 👍..

[@brilliantbikes]

Lol! Thank you for making us laugh and for watching!

[@oliverpolden]

"For some reason I don't want to damage the box...." hurls it away... "Sorry box."

[@brilliantbikes]

Lol! The box was OK! Thanks for watching!

[@oliverpolden]

@@brilliantbikes phew, so no boxes were harmed in the making of this movie. That’s a relief.

[@HH60gPaveHawk]

Intriguing! I don't think my Archive edition is worth getting this on; it's much to heavy to matter and I'd have to strip the black finish off first. That said, it'd be one of the first upgrades to a P-Line or P-Line electric that I'd get! I'll have to bookmark it for future reference.

[@brilliantbikes]

😀. Thanks for watching!

[@tbear4291]

You are the 'face of Brompton'.Next step face of Loreal!

[@brilliantbikes]

Many thanks for making me smile. Tag line - cycle because you’re worth it!

[@anthonyroach7974]

Brill

[@brilliantbikes]

Thanks for watching!

[@SingaporeUntold]

There’s a 3d print sleeve that works well for cf posts. Helps prevent slippage

[@joaogalante7712]

Have the stl?

[@mynameisntbobbybob]

Urgh days after I get an extended seat post for my p line 😂. Guess you can never have too many seat posts?

[@brilliantbikes]

Lol! 😀

[@effyleven]

I think I'd rather have a titanium one... more bounce, and maybe cost less?

[@brilliantbikes]

Let’s keep our fingers crossed for a future development.

[@christopherhood9241]

after the first 25 secs ..... in the jungle the mighty jungle the Brompton sleeps tonight .........

[@brilliantbikes]

lol! It was so hot! It felt the only way to hide from the heat! Thanks for watching!

[@CowichanMTB]

Do they make a dropper post so you can ride a Bromton in the bc bike race?😂

[@brilliantbikes]

Lol! I’m not sure how long my wheels would last! Thanks for making me giggle!

[@1061shrink1061]

Great vid... my electric 6 speed is a heavy fat b*****d! I wonder how many things I could throw at it to save weight. Maybe you could do a vid on just how far you could take an electric to get some weight off it? I'm thinking seat post, pedals, rear triangle etc etc.

[@brilliantbikes]

Hmmm that sounds like fun! Superlight crankset etc. Thanks for the suggestion!

[@curiouspenguin6887]

I've actually seen aftermarket titanium rear triangles for Brompton. So if you swapped that, you'd be close to having an electric P-line, eh?

[@bredemeijer9648]

I might just cut it to lenght. I'm not that tall. After that I could consider a lighter one and cut that shorter as well.

[@brilliantbikes]

Thanks for watching! I’d never cut a Brompton seat post, the bottom in flared to stop it from being pulled out!

[@titoan31]

product not found Edit : thank you !

[@brilliantbikes]

No worries here it is: Standard: brilliantbikes.co.uk/brompton-handlebars-and-seat-posts/5967-brompton-superlight-seatpost-carbon-standard-length.html Or extended: brilliantbikes.co.uk/brompton-handlebars-and-seat-posts/5969-brompton-superlight-seatpost-carbon-extended-length.html Thanks for watching

[@titoan31]

@@brilliantbikes Thank you, do you know the rider weight limit ?

[@Robert_Thomas832]

For safety I'll stick with steel, for 100g barely worth the risk and I'm not particularly risk averse. Thanks.

[@brilliantbikes]

Thanks for watching!

[@happyhome41]

Hmm, when available in the US ? Contacted my local dealer and he said UK is very slow to provide items to the US, and I may be in for a long wait.

[@brilliantbikes]

So sorry we just don’t know!

[@Raphaele00]

Thank you for your time for such a kind response, Very bad Brompton, its marketing department is terrible hahaha, I bought my first Brompton C Line 2022 thanks to seeing your videos and I was encouraged, I just bought the P Line 2023 thanks to the C Line that I acquired previously because they seem great to me (unfortunately I they stole) but I signed up and was able to buy it just 1 month ago, and I have looked around, there are very few, and I asked myself why Brilliant wouldn't do it, well in summary you are a great influencer in the purchase of this bicycle because you make everything look so easy and intuitive and they are also very fun, my wife doesn't miss one of yours. By the way, do you know if there is a video or if you have heard about whether it is possible to convert the T Line into 6 Speed? Or better yet, 6 speeds and electric with switch kit? or at least 4 speed with this electric kit? Let the success continue and we hope you release more videos soon, they are great and we appreciate that they have subtitles Greetings from Mexico

[@Raphaele00]

Hello, Good day Why DON'T you have a T Line or do you make videos about the T Line? The message you send is that it is not a good option or whatever the reason, thank you

[@brilliantbikes]

Thanks for watching and for the great question We don't have a T line (yet) as Brompton only sell them direct (currently) - as at Sep 2023 We did enter the ballot in the early days but were never successful We have been offered the loan of a T line - but don't want too many questions that we may not know the answer to Hopefully Brompton will sell us one soon - then you can be sure that we will make videos on them - they look great to us

[@Raphaele00]

​@@brilliantbikes

[@davidmorgan881]

Posting a post on YT....Unique Thanks 😁

[@MiataBRG]

2:03 Having removed the pentaclip be sure to throw it in the nearest bin and replace with a standard clamp which is simpler and more effective

[@finncarlbomholtsrensen1188]

As a Dane my 2019 SuperlightM6LXBrompton was delivered here with a 600mm seat post as standard! I have presently a 535mm Titanium, black seat post on mine (With a turned round clamp on top, to below the saddle), which is a little too short for me and my 184cm, but fits my German B&W travel-box (Mine is a black version)! I also have a little longer, Titanium seat post for testing, if it will still fit my box, and give better ride quality? My bike, with mudguards (I'm a Dane!), is presently brought down to

[@AncientYouth64]

I love Bromptons got one......Never ride it 😂

[@lotuselise4432]

I have four nah na nans nah and drive my 3.5l V6.........

[@brilliantbikes]

They are lovely to look at. Thanks for watching!

[@AncientYouth64]

@@brilliantbikes I used to ride it and my 2 other bikes, but when I started playing football again I had to stop cycling as it impacted my ability to run in matches

[@platypushatstand]

So £160 to save a mere 89gms? 😂😂😂 A titanium post would cost more and save more weight vs the steel post, inc the weight of the pentaclip (as it wouldn’t be needed).

[@CarlJeffery-x6t]

point less upgrade

[@deniscompton7308]

Collected my carbon seat post from the Sunningdale shop yesterday, the service was very friendly and informative as usual looking forward to trying out the new post 😊

[@brilliantbikes]

Thanks both for watching and for coming to see us!

[@lotuselise4432]

You need nicer shorts to be honest..............

[@brilliantbikes]

😂 thanks! I’ll go shopping!

[@rattymouse]

@@brilliantbikes No need. You are perfect!

[@musiqsoundsproductions]

I just got one, but feel a bit scared at its full length going over bumps. And im fairly light with 82kg So I might sell it.

[@brilliantbikes]

Thanks for watching! To date we have not heard of any failures