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Great vid. We're refurbing our Bromptons for touring and one of the FIRST upgrades will be to switch to a waxed chain, making handling the bike and chain a lot less dirty.

Thank you.

I came back here after a long time for Accent!

Great video as ever, thank you. Is there a particular reason why you selected the chain that you did, rather than the standard Brompton PC10?

😀

I've just binge watched some of your technical videos regarding Bromptons, and I must say I'm baffled by the quality of your explanation as much as your production value, which very much go hand in hand. Thank you for putting out quality content, it goes a long way

I just got my rental¹ Brompton with the telescopic seatpost and M-Type handlebar. My inseam is 85 cm, but I'm did the testride most comfortably with the telescopic post fully extended to it's maximum. The good thing is that this position also is most closely to the position I had on the Tern Joe C21 that needs replacing², which I rode somewhere between trekking and racing positions. ¹ Rental to try it a year before purchasing one, or not. ² The aluminium frame broke right at the seatpost insert above the top framebar.

Thanks for this video…very informative indeed. ❤

Riding a bike and understanding it in detail was really a new concept. If the second hand market here were popular or less unregulated, I would probably consider seriously too. It's excellent for storage and portability.

It's a nice comparison from a design perspective with technical approach. Accidentally that helped me choosing wheel size between 16" and 20" with gear already near the ground (< 4"). It's just amazing how much knowledge there was. (I've been riding bikes just 40 years but just knowing how to replacing tires.) Your systematic way and articulation were enhancing.

This was greatly handful on my buying it (40th anniversary ver) a month ago. It showed what to consider from a science approach and experience. Thanks a lot.

This was really educational on gear inches and leverage. It's been helpful from your other videos combined. I checked the single speed line was 50T on its formal website. For the last part on a 4.5% slope (equal to 22:1), how hard could that be for an average-fit person close to 60? Thanks.

Very informative video, thanks👍

Would you happen to know if this can be used with an electric Brompton? Thanks for all your videos! They’ve been really informative ❤

Great video, thanks. The comments here are also really helpful, much better than the Brompton groups I used to be a member of, one of which I left when some bloke had his frame gold plated.

My wife Linda (now 69yr) and I (73yr), first bought our Brompton (M6R with a 44 T chain ring) in 2019. It was an indulgence in a way, as we saw it as an easy bike to transfer and ride for holidays in Europe. Our first overseas trip to Europe was soon after purchase, and included a ride over Col du Tourmalet with all our luggage, then some rides in the Dolomites near Bormio (including Stelvio, and a ride up to Passo di Gavia - in June 2019) Returning home it has become our everyday bikes, and my Brompton has done over 38,000 km in 5 years. Looking to the future (we’re not getting younger) we are looking at the Titanium 12 Speed bike, a much lighter bike at 9.2kg (including a rear rack) However this bike has a 50T chain ring. That means that riding on the flat at a cadence of 90RPM, your top speed will be 49.4km/hr. That is ridiculous gear to have; only an elite pro -cyclist could achieve that speed on a flat smooth road (without riding in a peloton) On steep hills, assuming a ‘grind’ cadence of 40RPM my speed on a 12 speed Titanium in the lowest gear would be 5.5km/hr. (which is the same as my current Brompton M6R with a 44T chain ring - determined from www.sheldonbrown.com/gear-calc.html) ie the 12 speed Titanium currently offers NO benefit other than a lower weight. Brompton currently doesn’t offer a 44T Chainwheel on their Titanium bikes. The 44T chainwheel is a MUST for me in riding around the hillier parts of Melbourne and in our mountains; and I’m sure for many in other cities around the world. For my hills, a 12sp Titanium with a 44T chainring it would mean less grind (perhaps an RPM near 48) at a speed of 5.4km/hr, and keep me riding to 80! Why doesn’t Brompton add a 44T option to the 12sp Titanium range and provide a 12 sp Titanium that meets the need for a lot more potential Brompton bike riders. It’s a no-brainer; Brompton, it’s time to come to the party!! (Will Butler - Adams, I’m happy to buy you the first drink)

I upgraded my c line to 12 speed using a minimids kit with lower gear range 11-13-17-21 cogs

I can whole heartedly recommend these tyres as well. I've used them for almost a year on my hybrid, size 29" and they have never ever had a puncture. plus they roll so well and silent. in both winter and summer weather just amazing tech. ridden on 30, 40 and 50 mile rides. 100% recommended.

Great video, as usual! I am thinking of ordering the dual chainring but I am nit sure which one should I select. What are the advantages of the 54T/33T over 50T/33T? Will it give more speed while riding on flat terrain? Would I lose some of the gears in between? Thank you

Hi, Pam! I really love your and Gilbert's channel. Such great information about bikes, tours, accommodations, etc. By the way, do you come from a scientific/technology background? You seem to cover a lot of wonderful technical details about bikes, bike performance, etc. You may have seen this UA-cam video, but one gentleman installed a front derailleur on his Brompton to toggle between his small and large chain rings, and it seemed to work flawlessly. As a cyclist who has ridden both of these bikes extensively, do you think that the Mariner D8 is significantly disadvantaged compared to the Brompton for the flight to/from, getting around by rail, being able to store your bike in hotel rooms, etc. on the Four Rivers Ride? I absolutely love my Dahon Mariner D8, but I'm wondering if I should just bite the bullet and buy a Brompton C line, 6-speed to get around more easily during this trip? Thank you for your thoughts on this!

I really don't understand why brompton is too stubborn to just use a dual chainring. That 12 speed T-line makes no sense at all, putting a super heavy hub on a lightweight bike. They should've just used this system instead!

Nosed saddles are absolutely horrible. Stopped cycling for 10 years because of it. I got a cheap noseless wide bum seat which is still too small for my fat ass lmao. But it worked on my beach cruiser. I plan to save up some dosh for one of these since it looks like it would solve the problems both nosed saddles and my current noseless saddle are causing me.

Hi, thanks for your video. Did you have to remove the seatpost when fitting the Brompton into the Samsonite Epsilon 29in ?

Which mini pump are you using? I have Wotancraft bags on my Brampton now too thanks to this video. Thanks for taking the time to share!

I use 54/33T chainring on my brompton, and like you i found when touring i just leave it on 33T is very convenient when carrying all the stuff. 54T reduces the overlap between the gearing and increases the range further. I did few tours on it so far - and find it great. I got my local bike shop to install it, and only quoted me £70 for installation, which considering I don't have the tools for bottom bracket removal is worth it. I would also say as the chain ring is actually lighter than the original chainring, it's one of the few mods that increase the range of gears AND you lose few grams, rather than gaining.

You guys are always educational !!! Clear and concise. Thank you. I was thinking about getting a 4-speed Brompton to be used as an urban bike in NYC. Very little hill climbing would be needed. I would like to use a single tooth chainring upfront. What size chainring would you recommend so I could comfortably pedal at 20 mph in 4th gear? The lowest gear doesn't need to go so low. For that rare steep hill, I don't mind getting off the bike and walking. Top speed is more important. Thank you.

Amazing video as usual. I just bought a 6 speed c-line. Is the 12-speed coming out soon?

i would heavily suggest traing out Chain Wax instad of Oil .

Thanks for the update and quick explanations, this kind of real world testing is very valuable.

Thanks for this great video, as always @2Bikes4Adventure. I went for the 50-33T upgrade based on our review. It generally works well, but there is a clicking sound when I use 1+, 2+, and 3+ on the 33t chainring. The 1-, 2-, and 3- work well, without the clicking sound. Do you get the same issue? If not, what do you think it could be due to? Thanks!

A generic derailleur like the duraace

No one can imitate Brompton's ingenious folding design. Even 2nd best will be much to be desired for folding design and it's simplicity. However, after owning several Brompton over the years, it does have some drawback. Biggest one is the weight. The standard Brompton weighs around 28lbs. It makes a huge difference when you travel with it, especially mass transit. Second is the maintenance. The standard use Sturmey Archer integrated hub design. It is very fragile and requires periodic maintenance. It's definitely old school. So you will likely need to bring it to a Brompton dealer for service regularly to maintain its proper operation. Otherwise, you will start to notice shifting issues. Third is, you will need to wipe off any water if it gets wet. It rusts very quickly if you don't - especially if you live in humid or live where inclimate weather is frequent.

very good video

I have a Dahon vector x27h 20inch folding bike. Is this suitable for long distance touring? Folding size is bigger than brompton. Can i travel by plane with my bike for luggage?

I've been a lifelong road bike rider, primarily on bikes with 700c tires. I bought a Brompton about 6 months ago due to 1) desire to travel by air and bring my bike with me, and 2) many years of arthritis in my hands has finally convinced me to move to a less painful riding position of the Brompton, which requires less weight on my hands. I love my Brompton more each time I ride it, due in part to so much less hand pain but also because I just find it quirky and also find that I'm riding a bit slower and just enjoying the slower more deliberate pace and the curious looks of the people I pass. I've wondered what the actual differences were in speed and performance compared to my very fast carbon road bikes, and this video has answered those questions with remarkable accuracy. Thanks so much for making these great videos.

I bought the bag and a smaller mount (same width as bag) and fitted the bag vertically instead so it’s easier to access the contents without taking it off. Love these bags so got two and they are my new go to Bikepacking kit.

I want fluo.

Well done overview, since 5 years with 28,24 and 20 inch old foldings maybe its now time for a quality made 16 type.until last year i didn't know that in the netherlands busses its forbidden to take a bike; exeption a folding type ;-)

Smashing ideas with beautiful sizilian views.On a test ride ride i take my bis discgolf bag in front and fixed it at the steering by the breast belt..these bags are often cheap avaiable , i prefer those with hard bottom and comfortable straps.

Great review and Hope you are still lucky with IT. Just looking for a used one i saw one with 24 Gears but remember He GRIP Shift in my old montague that was Not so fine Like antrigger.qasi understand IT richt the P 8 Mu IS the new model with a more modern Look.

Which is best for guys 6’3

Thanks for the video. I had a Brompton for 20+ years but got a new 6 speed a year ago. Default 50 chainring way too high for me, so replaced with a 44-28 double (new BB needed). In 28 chain *just* clears the chainstay. V low gears but that’s what I like - not had to walk anything yet. Top gear not high but enough for me. Like you a 4 gear overlap so don’t have to do the manual change too often. A front changer would be good, but I agree it’s still a v good setup as is.

I can’t find a samsonite Epsilon on eBay or locally. Do you have another hard case recommendation?

No good for uk roads with all the potholes if it can’t read shaky camera footage

On Strava Andrew’s power for that climb is 434W

Are there other folding bikes that can be pushed around after being folded like the brompton? Preferably 20"?

I've always wondered why Brompton kept the dual derailleur-cum-hub contraption instead of using an all-in-the-hub system. Less hassle, less grease, they could also move from chain to belt at the same time.

I had a poor experience dealing with the owner Jeff. Long story but let’s just say I didn’t get the seat. Most bizarre experience I’ve ever had with a sales person. I wonder how this guy can run a business with a personality that was so self righteous and condescending. My advice would be for him to stop lecturing people about the seat and just answer some simple questions, take the money and mail out the seat. This guy can’t get out of his own way. That was my experience anyway.

on long trips i only carry patchkit, tube, spare tyre, spare valve, 3 levers, 3-4-5 mm allen, and a 15 mm wrench. i never remove the pedals and don't carry braking pads and of course this doesn't prepare me for chain problems but i can live with that. i'd just get off and push the bike until i reach a shop if i ever break a chain somehow. i'll consider adding an 8 mm wrench because of this video. never thought about it but this could have come in handy last time the stranded water froze into the brake cable housing right at the caliper where it's going upwards.

Seems like a Tern Link or Dahon MU SL might slot right inbetween these two and address some concerns.