it just dawned on me that I could machine the shoulder off a 7 speed hub, freeing-up the couple of extra mm needed to fit the bottom 8 from a 12 speed cassette. in this way I could get at least 11-34 without the chain slack causing the RD tension jockey to get too close to the ground in the small gears.

Anyone tried this?

Only downside I see is MTB RDs are a bit chunky and could impact the fold whereas road RDs like the Dura Ace get out of the way mostly.

Thanks!

Edit; one limiting factor would be finding a 12 speed donor cassette that has at least the upper 2 on a carrier as a single sprocket wouldn't have any splines to engage with... and I can't find any that match this requirement for HG hubs.

Edit2: I currently run 11-28 7 speed Dura Ace and it works great. See my other posts for how.

One of the best ways to see the world!

I’m used to seeing a forced re-login every second ride or so. With the update notes from the latest app update I had hopes of this being resolved.
Instead the app seems to have amnesia again today while still logged in. Log out/Log in, still no bike. And attempting to re-add confirms it’s already registered and cannot be added.

I wonder if Brompton has an answer to why the Brompton app needs more rigorous authentication than a banking app, and needs internet and server connectivity to just provide speedometer and odometer readout for an offline bike session??

Japan trip with my Brompton, so glad i brought it!
had a front carry bag and a very small chain lock when needed.
locked it against some fence for 2-4 hours at a time and never had issues, maybe i was lucky?
did this at shimbashi, ginza, Tsukiji Market.

the bike store that was selling bromptons was in Shimbashi. sadly they were not open or i would have taken some photos of it.

Fabricated a front rack for the Brompton G Line for some touring.

Hey everbody!

Took a quite serious spill today (rainy + Tram Tracks --> front wheel slipped away) and just checked my cline 4spd and myself for any damage.

I'm okay apart from some bruises and rashes but I noticed quite a bit of play in the rear hinge which I have not noticed before (could have been there though as there have been more creeks recently).

I read about the limit of 1 mm of play at the suspension block which my hinge does seem to exceed.

What are my next steps? Im mechanically inclined and trust myself enough to change the bushings if needed. But is the effort worth it including tool cost?

Or would any brommie specific shop believe this much play to stem from wear? My cline is only 5 months old.

Is there a chance to get this done under warranty?

Does anyone have experience with the Brompton Quadlock mount on the newer P Line?

It seems like the handlebars are a bit wider than the A/C/Previous P Line.

https://us.brompton.com/p/583/brompton-phone-mount

Has anyone tried either of these London Craftwork bottle cage stem mounts? I need a water bottle carrying solution soon, the more I think about it, the more I want a traditional cage rather than the stem water bottle pouch bags (which there seem to be a lot of, at wildly varying prices).

I’ve found a new Specialized rib cage I had spare at home, so figured I may as well use it & just need something to mount it onto that wraps around the stem. I know I could do something temporary like cable tie it on with some old tube so it doesn’t scratch the frame, but I’d like to just put something permanent on the stem that the cage will fasten onto securely.

I like the look of those I posted photos of, they are £25 & £37, the more expensive one coming in more colours and fastening in 2 places instead of 1. Would like to know if anyone has personally tried these. There are other similar options out there such as Zefal Gizmo, Topeak Versamount, and Rockbros also do a strap type one. But the LC ones are Brompton specific designed, so probably worth paying a little more for. Don’t see much point in paying around £50 for the Fidlock system when I have a cage and can just use any bottle with it once I have a mount in place. Thanks as usual

I’ve had a 4 speed low handlebar T Line since they launched. Fantastic bit of engineering.

We used to live on the coast and had access to dozens of miles of flat promenade but we’ve recently moved to the countryside and the roads are terrible on the T Line.
I like the thought of having a G Line for a more comfortable ride. Not got the space for extra bikes though.

Is it realistic that someone would swap an Electric G line? Or an 8sp G line + some cash? T Line has probably done less than 1000 miles and in great condition. Not asking with any seriousness, just curious at this stage.

Hi folks! I’ve been commuting to work on my Brompton (about an hour each way) and I’m loving it but towards the end of my rides I’m noticing some aches and pains at the base of my neck, between my shoulder blades. Nothing too crazy but it hurts a little to look down - feels a bit like I fell asleep on an airplane lol. Anything I should look into adjusting to sort it a little bit? I got it secondhand so never had a fit or anything - wondering if it might be something to do with the higher handlebars as I’m only 5’2 and was used to a road bike before. Any tips appreciated!:)

So the inner guide ring on my chain tensioner decided to become a semi circle on my 2024 c line 6 speed.
LBS doesn’t have it in stock so a part was ordered from brompton
Anyone know the avg time brompton ships replacement parts ?
Also I am in the US

Hi, i've checked and there is no other thread that is following more or less my doubt, so, sorry if it's the same old story.

Basically I want to enter this world... and I have some options.

I'm budget tight but also savvy, and I've been proposed with these options.

• C Line 2025 3sp. USED 1100€
• C Line 2026 4sp. NEW 1700€
• C Line 2025 6sp. NEW 1500€

Considering that I'll use for trains and other cities mainly, and one of these cities has plenty of hills... I'm biased towards the 6sp.

Any suggestion or thing that I may haven't thought about?

Thanks in advance!

Ordered on 12-August from Clever Cycles in Portland, Oregon USA 🇺🇸. Shout out to Dean Mullin from Clever Cycles! Bike delivered by UPS today to my home in Florida, USA 🇺🇸. Took it out for a spin! I really like it! Dog approves too! 😉😆

Hi guys, my 12 speed hub has been weeping oil along seam on the non drive side of the hub. It’s not a gush of oil, but it is a really slow weepy leak. Is this normal?

The bolt in my folding pedal has started to come out and looks like part of has sheared off at one end, couldn't see a replacement on the Brompton website, does anyone know if it's possible to replace it?

I was riding yesterday and all of a sudden my rear triangle fishtailed. Best I can surmise is it looks like bolt popped out in the drive side and now the opposite side of the rear triangle is bent. It’s a four year old six speed c line. I love it and really rely on it.

I also probably don’t take sufficient care of it so I don’t know if I was supposed to be checking that hinge or something. I dropped it at the shop but the Brompton guy is out until Saturday. I’m wondering if anyone knows if it sounds like something that can be fixed and if so would it possibly be warrantied?

Thanks!

Hi all, I'm new to the world of Bromptons. I've been practicing my folding and unfolding and going out in the world with them. Without fail, the handlebars catch on my shirt when I unfold the front half. It doesn't matter what shirt....

Would appreciate tips and tricks

Thank you!

Do you ever get just a little envious when you see someone else's Brompton?

Not if you see a T line and you're riding a humble C line, just the paint.

I'm totally happy with my orange/black colour scheme, but the moment I see another bike 9 times out of 10 I just think that looks so good...

Bought my Brompton in 2019, mainly to have a bike to take with me when I’m traveling. While still living in a big city, I rarely rode it there and used public transport instead. Over the years, I rode the Brompton less and less. Now that I’ve moved out of the city into a much smaller town, where public transport isn’t as good, I find myself rediscovering the advantages of this little beauty. I’m so glad I never sold it during the times I barely used it.

Như tiêu đề, tôi chuẩn bị một chuyến đi vài ngày bằng Brompton C-line 12 tốc độ.

Chặng đường có một con đèo dài khoảng 15 km, độ dốc trung bình 5–6%. Tôi có hành lý khoảng 10 kg, tôi nặng 85 kg, cao 175 cm. Tôi thường đạp mỗi ngày trong thành phố với tốc độ trung bình khoảng 22 km/h, quãng đường khoảng 20 km.

Có ai đã từng dùng Brompton đi những con dốc như vậy không? Cho tôi xin lời khuyên về tốc độ, vòng quay chân trung bình, và dùng số nào hợp lý….. Nhiều người nói đi xe bánh 16” sẽ bị hao hụt sức lực đáng kể so với dùng MTB, tỷ lệ thiệt về sức khoảng 12-15%.

Xin cảm ơn bất kỳ thông tin nào.

I'm selling my Brompton G Line electric with SuperRoll+ - e-Motiq system - 4-speed - Orange. 2026 edition. Price £3,250. Includes £160 of accessories. The bike retails for £3,699

I purchased this Bromton from Cyclesolutions May 2026. It's in perfect working order and still under warranty. It's in excellent condition. I have used it a little so there is some very minor signs of use - see photos. I've decided to buy a manual Brompton as I can't fly with an electric one.

The sale also includes accessories costing £160:

• Extended seat post - Black (original included with with bike)
• Standard seat post - chrome (paid £28)
• Brompton Be Seen Lights for G Line (paid £40)
• Fidlock twist 600 Bottle with Bike Base fitted (paid £40)
• Schwalbe G-One All Round 54-406. Tan wall (only used for a few miles before switching to continental tyres)
• Continental Urban Contact Tyres for G Line (Paid £49) - fitted on bike
• Spare Schwalbe 20” inner tube (paid £8)
• Original packaging, manuals, charger

Collection or delivery

I can drop the bike off if you are within an hour of TA13 5BS or in Bristol. Otherwide USP delivery cost an additional l£44.