I changed mine to a 39t and it transformed the bike. Brompton should offer this as an option 😊

Changing to 44T was the best mod I’ve ever done. Didn’t realise a 40 and 39 were available too. Many thanks for this informative video. 👍👍

I recently switched to an H&H 40T (and made a video about it too!). Like you I started with the standard 50T on my M6R, found that a bit too long and swapped it out for a 44T which worked fine for most things but left me struggling on the occasional steeper inclines. The 40T is definitely better and still gives me a long enough top gear for my leisurely riding style.

Spa Cycles of Harrogate sell Stronglight T55 chainsets for £30 in all sizes from 38T to 50T. I fit whatever I need for the area 38T in hometown Bradford! All you need is a cheap puller.

It really should come with the 44t as standard. I changed mine to 44t and I could actually use all the gears!

Both my wife and I changed to the smallest front chainring available from Brompton. I think the default gearing is just too high for the majority of users.

I went from 52 or 54 (whatever the stock was when I bought my 3 speed) to a 44. Haven’t taken the plunge yet on a 39 as I’m a bit worried about not having the guard. Expect its not a problem in reality?

Another beautifully produced and very interesting video (yes...Brompton owner!) - M A N Y Thanks for taking the time to share... I definitely have P handlebar envy too!

Had a mad moment about buying an electric Brompton. We get a big cash back from our local government here in Montpellier for the purchase of an e-bike. Just seems like the Brompton hasn’t got much range ? And even plenty of issues on reliability ?

Good work. I live in a hilly area and use a 44 tooth chain ring and would like to try a 39 or 40. Question: is there a chain guard that fits your setup?

Fascinating! I'm about to take the plunge on a Brompton C-Line Explore, that will become an "adventure bike" to take on trips and holidays. It's just too much faff to take either of my full-size bikes on trains, and impossible on buses, and inconvenient in the car. My adventures always involve lots of climbing, often on long, steep ascents, so low gears are critical (and having several gears is important - hence the choice of the 6-speed C-Line).

Awesome effort, Paul. And your English weather just puts me in mind of what a hardy bunch of cyclists you have to be, while here in Calif. I wouldn't think of riding in the wet!

What a wonderful workshop so organised brilliant

I did exactly the same thing a couple of weeks ago, and couldn't be happier with that setup.

I did the same work on my M6R... now it's perfect for touring... 👍🏼

I fitted a 39T Shimano Ultegra chain ring to my Brompton that I had lying around unused but not before, I had gone through the hassle of buying two TA ones, but wasn’t impressed with the poor quality, lots of rough edges on the casting of the teeth so sent them back, twice.

Thanks so much, I just got a Brompton 6 speed here in the US. I THINK I'd rather get the H&H with the chain guard - but I really don't know the pros and cons of a chain guard.

My 2019 "SuperlightM6LXBrompton" has 6 gears and when I had bought it (During High Covid19, for the vacation money saved), I at first I wondered for which use I had the low gears, till I met a very steep Danish Serpentine Road (On the Danish Island of Bornholm), and had to walk on top, to go up! I have seen double chainwheels for the front, but I can't - imagine for which conditions I would ever need a gear which was further down than mine (I'm able to walk faster than that). My bike has been much modified down to now 8,75 kilo, and still with its mudguards (I think about the same as a T-line with 4 gears, and mudguards?) As a Rainy Dane I never leave Home without them! I expect to reach 8,5 kilo with a little further changes and work! Finn. Denmark

Hello Paul,

Nice video....I'd like to know if it's possible to replace only the sprockets with 17 and 14 and keeping the 44t chainring. Regards from Turin (Italy).