Brompton 2 / 6 speed Derailleur - how does it work?
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- Опубликовано: 28 окт 2024
- The original Brompton derailleur system is used on 2 speed and 6 speed Brompton folding bicycles (not to be confused with the 4 speed derailleur introduced with the P Line and used on the T Line and 2023 C Line Electric)
This short video gives a basic description of how it works and some simple troubleshooting tips
Clue: Most trouble is dirt related
If you would like more technical detail - let us know, and we can make a more detailed version
The video shows (in summary)
How the chain pusher / derailleur changes gear
Removal of the chain tensioner
Quick clean of the chain tensioner
Removal (in place) and clean of the chain pusher
Limit screw adjustment
“Please ask permission from your significant other when cleaning bike parts in the sink” - this could be the single most important tip from the video LOL
Haha indeed
Thank you! I was sooo stuck! I couldn't figure out why my bike wasn't changing gears.... Just watching your explainer made it all clear. I recently fixed a flat tire, and seem to have over-tightened the bolt. So tight in fact that the jockey wheel had no room to move. It was just a matter of un-tightening it. Not what you mentioned here, but without watching your video I wouldn't have figured it out. Thank you from Mexico.
So glad it helped and thanks for watching!!
Thank you so much for your videos. Today I changed the back tyre of my brompton. Without your instructions I am afraid I wouldn’t have succeeded. ❤🙏🙏🙏🙏🙏🙏🙏
So so glad it helped! It was also a game changer for me knowing how to change my inner tubes and set up my bike 😀. Thanks for watching
Thank you very much for your videos! They are absolutely great and helpful ! 👋 from Zürich 🇨🇭
Thank you for watching!
Your videos are easily the best there are for maintaining a Brompton. I am a complete bike novice, but you always explain things so well that I feel confident trying to adjust/mend things myself! Thank you.
As usual - yours are the Go To Videos for maintaining the Brompton - THANK YOU!
Thank you so much!
I really appreciate that you've made the effort to come back and amend the description on this older video to indicate it doesn't apply to the new 4 spd :)
You're very welcome! we don’t want people getting confused
It might be an idea to mention the barrel adjuster. I didn't try adjusting it until after owning a second bike. Tightening the tension in the cable seems to have fixed the poor shifting issue that I had for years. Maybe it's more common knowledge for people that own more conventional bikes, but I wish I knew to adjust it and what it does.
Thanks for watching! Next video coming up!
Am totally new to trifolds. This one brilliant educational video had me figure out how a shifter that had no -/+ indicator window changes gears from high to low by just observing the pull of the chain, movement of the derailleur and the sprocket it jumps onto. Thanks a million and please keep it coming! God bless.
Many thanks for your nice comment, so glad it helped! Hope you enjoy your Brompton. Thank you for watching.
Had an issue with the gear changer/derailleur and your video hit upon all the things you could do to make it right. It worked. Thank you!
So so glad it helped! Thank you for watching!
Very helpful. I suspect I will need to watch this many times.
So glad it helped. Once you have adjusted it once it gets much easier.
Best Brompton’s Knowledgeable channel on RUclips!!!!
Wow, thanks! We really appreciate you taking the time to watch and your kind comment
I tend to agree with you there - the quality , sense of humour and content make it a good Brompton resource.
Can you do a dedicated video on replacing the shifter cable and tuning the rear derailleur for the external 2-speed? How to tune the length of the cable with the barrel nut to match the shift points.Thanks
Please make a video about replacement of gear and brake cables! How does the new gear shifters differ from the pre 2017 shifters wrt cables replacement?
I really appreciate your videos. Have used your online shop a few times now and will continue to, great that you do so much for Bromptons and Brompton owners. Thank you.
Thank you so much!!
Don't own a Brommie, but I didn't realize that the 2spd versions had actual derailleurs instead of internal hubs! Pretty neat miniaturization of the bigger derailleur systems
It’s really cool and works so well with the hub gears
Thanks for watching!
Thank you for this video. It is the only detailed video on how to set up the chain pusher that I have found. You saved me a trip to my local bike shop.
Thank you so much for watching! Glad it sorted it.
Brilliant video. Thanks so much for making it.
Thank you! And thank you for watching!
I ❤your posts. You saved my day again! Will continue to shop from you in return. Thanks a lot.
So glad it helped and thank you!
Thank you! Chain fell off my daughter’s Brompton and didn’t know how to get it back on the derailleur. Watched your video and got it back on easily🙂👍
When I had bougth my new Brompton (H6LX) in 2019 I took it in my cellar and gave it an autopolish all over, to protect its paint. By that I saw that - even after only two folds, the "small clear tape" from the Factory had been worn through to the paint, So I immediately ordered a set of carbon plates for all the known week spots on a Brompton. So today I haven't got any "Brompton Scratches" on my frame, as to clearly be seen here! 😄
Great idea! Thanks!!
Really useful video. Being more accustomed to traditional bikes, and not having had time to take my Brompton to bits, I always assumed it changed gear by witchcraft. Interesting to see how the unconventional derailleur works, thank you.
Thank you so much for watching our witchcraft 😊.
Thank you so much for this - whenever I have problems with the derailleur I can never remember/figure out which way to adjust the screws to get the desired effect. I’ll be referring back to this next time!
Thanks for watching - we really hope it is of some use
The way I remember is this:
1. The Allen screw further away from the rear wheel axle is for the higher gear (high=far)
2. The Allen screw nearer to the rear wheel axle is for the lower gear (low=near)
3. Loosen screw to close gap between wing and idler wheel (the wing that's supposed to be almost touching), tighten to widen gap
(I have this last point noted in my Brompton Manual as it is the easiest one to forget)
One tip: if you could zoom in on the parts as you adjust - I couldn’t see the daylight you referred to…. Great video, 👍I’m familiar with other types of gears but Bromptons is different.
Many thanks! Will do!
I could listen this your lovely accent all day☺️
Thank you so much. And thank you for watching!
Thank you very much for this video.
I have had my Brompton for over two years--but how to adjust the gear-cable-indicator chain has never really sunk in. Your clear explanation saved the day. It saved me from going to the Brompton shop (quite far away) and spending money for something I could do myself--thanks to your mentoring. Thanks again!
So glad it helped! Thanks for letting us know and for watching
again, thank you very much for sharing all these knowledge with us.
your channel is extremely helpful, I was traveling alone earlier this month, and your videos helped me to perform self maintenance when my Brompton malfunctioned!
Again, thank you for watching
And thanks for the kind comments
We are really happy that we were of some help - letting us know that really made our day
My chain-pusher wasn't properly functioning as I needed to loosen the 2.5mm bolt fitted to the 'dogleg'. Many thanks for the video and hints.
So glad it helped.
Thank you for watching!
@@brilliantbikes I didn't know what I didn't know, ie that the 'dogleg' could be adjusted! I also don't know why it became tight? A good lesson learned for this fan and rider of Bromptons.
Thank you so much! I’ve just had troubles with selecting the low gear and by no means could figure out how to adjust it.
Thank you for watching and for your comment.
Really glad if it’s helped.
This video is gold! You saved me from having to be the doofus that has to go to the bike shop, where they'll charge me $50 just to adjust a couple screws. 😊
I just put a new chain on the Brompton ... the bike has done about 3,500 miles. Did not change the rear sprockets. BIG MISTAKE. The new chain kept pinging off the smaller of the rear sprockets; I couldn't do anything about it. Had to refit the old chain, in the end. Have now ordered new sprockets from you. Live and learn.
Thanks for the great feedback
It would be our number one tip - if changing the sprocket change the chain, if changing the chain change the sprocket
We often describe them like a comfortable married old couple - they get used to the way each other work!
@@brilliantbikes The spares arrived promptly ... and the new sprockets have completely cured all the problems I was experiencing with the gear-change.
The included nitrile gloves were a nice touch, and very 'handy'. Thanks.
Brompton should pay you for these videos❤
Thank you for watching!
@brilliDoes that mean they already do pay you?antbikes
Really useful, I have had brompton’s for 10 years and as far as the derailleur is concerned cleanliness is all important. My daily route includes 3 miles of old railway track each way and in winter weather I have to clean this regularly, the brompton videos can be useful to. Today replaced my chain and sprockets after 6 months all supplied by Brilliant ~Bikes who I have shopped with for 10 years.
Thanks for watching
Thank you for your kind feedback too
Finally - thanks for the great info for other users. It’s our number one tip - keep it clean :-)
Thanks so much for the clear explanation. Excellent!
So glad it was helpful! Thank you for waiting and for your comment
Very nicely done! Very clear and pleasant presentation of what can be a complicated mechanism. 😀
Many thanks, so glad it was clear.
Thank you for watching!
Again a lot of knowledge delivered in an easy to follow way. Thx so much for your videos!
Thank you so much for watching and the kind comment
fantastic teacher, fantastic information.
Thank you so much for the informative instructions👍🏻👍🏻👍🏻
Thank you so much for watching!
Thank you! That just saved me lots of time and frustration.
really nice guide ) informative and helped me to fix gear issue on my 6 speed
So glad it helped 😀.
We really appreciate you watching and commenting.
Excellent! Thank you for posting.
Thank you for watching, glad it was useful 😊
“Please ask permission from your significant other when cleaning bike parts in the sink” Wonderful. Not an issue for me though, since I live alone and make sure I don’t do this type of thing when the kids are visiting.
Great Video interesting. You quickly sorted the problem
Thank you! It can just be a little fiddly sometimes!
Thanks for this, I am buying a used Brompton and want to do a whole clean up before using it. No need to pay anyone anymore.
Thank you!!! Your videos are so useful and you have a nice way to explain how to do the job.
Thank you
For watching and for the kind comment
We try and make them useful and interesting
Any suggestions are welcome
Thank you so much, had the same problem with my Brompton and could not get the spare parts ( chain pusher and spring, cable) from my local Brompton dealer (tried to get them from Evans but they out of stock plus they sold me a wrong size cable 😳), ordered those parts from brilliant bikes and got free delivered really quick. Excellent customer service!
Thanks you, very helpful. I am particularly impressed you don't wear gloves.
Many thanks for watching! Glad it is helpful! Ah I sometimes where gloves! When I remember…..
Spent a good 20 mins trying to adjust mine with no luck. Then noticed the housing for the bar/spring was moving about, maybe weakend or something. Anyway, cable tied it to the chainstay and it works fine now. British engineering at its best, no wonder we don't have a car industry now.
Did the small nut fall out?
Excellent video once again 👍
Thank you for watching!
Great video, thanks! Will be running through this as the Brompton derailleur seems to have stopped working.
Thanks for watching and the kind comment
Good luck with your derailleur fixing
Really, really useful and took the mystery out of the Brompton derailleur. Thank you.
Thank you for the excellent video - helped sort out the sticking derailleur on my M2L (2018 UK)
Thank you watch and for your comment. Thank you that’s made our day.
Thank you! This is gonna be so handy for the rebuild. Glad I didn't lose that little washer.
Great Video, I have a Brompton Electric.
I have just had this problem and couldn’t work out how to adjust the derailleur thanks for the detailed maintenance I have just subscribed
Ur video is perfect as always! I still couldn’t figure out the issue with my derailleur adjustment .. it’s stuck in the large sprocket ... will try again and see if I can get it right
Really helpful video. I had similar issue, followed all of the steps but it didn’t improve. Eventually I changed the chain pusher for a new one, there was some wear on the inner channel which I suspect was contributing to the issue. Resolved straight away. I wouldn’t have had the confidence to tackle this job without your video. Thanks.
I just purchased the 6 speed version and I was wondering if the rear wheel suppose to be perfectly centered on the frame? Looking at mine it isn't hitting anything but the wheel isn't perfectly centered. Thanks to your informative video, my gears are now shifting perfectly.
Thanks for watching! Nope it’s not perfectly centered as the frame is not symmetrical
@@brilliantbikes Thank you for the answer Sir and It is very helpful!
This was great. Thanks for the tutorial.
Hi. Always awesome. Q: My brompton chain makes a little clicker clack as the earlier part of your video your chain made. I notice in the post posher adjustment your chain no longer makes that sound. I’d like to seat my chain on the sprockets so that it doesn’t make the sound. It used to not. Started after I swapped tires and tubes with shealbe marathon plus. I was thinking many it’s my gear change chain in the 3 speed hub. TIA 🙏🏻
It sounds like you you need to adjust the derailleur needs adjustment!
Thanks very much, new chain, new sprockets and my +- gears work better.
So glad it helped! Thank you for watching!
Great video. Very helpful. I've only done the first one and a half steps so far (which is normally weekly regime anyway) as was going to be too late for work, but reckon cleaning more winter crap out is going to get it going for me. I've been a bit negligent the last couple weeks. But really well reasoned steps to sorting, before starting to try and adjust, but thanks for explaining that too. Reckon I wont need after doing the next half step! ;-)
Thanks for watching and for the kind feedback
Keeping it clean is the best tip - but easier said than done this time of year
Acabo de encontrar tu canal, es muy interesante y muy útil para mi porque tengo una Brompton de 6 velocidades, estoy emocionado de tener una bici de este tipo.
Eres una linda mujer.
Saludos desde Puebla, México.
Ciao
Great video ! Learned quite a bit. Bonus she is sooooooooooo adorable
Thanks for watching and the kind feedback
Hi, thanks for all the information shared, I manage to clean the jockey and and adjust the limit screw . it works better now and my better half okay with the sink usage. lol . great video
Thank you my Dear for the video.
And thank you, for watching
thanks for putting this out there. really helped me, as a novice, to install a new shifter and anchorage and then get it adjusted. cheers, chris
Thank you! Saved me some headaches!
So glad it helped! Thanks for watching!
Hi…. Absolutely great video and it really encouraged me to try and do a proper job sorting my gears out the first time round rather than trying to do a quick bodge!
HOWEVER! Amy gears still don't work properly….. I can change from high to low gear but I get no click that holds my gear shift in place….it just pushes right the way back to high gear again… any idea what could be going wrong!
Very helpfull!
Thanks for watching and I’m so glad it was helpful!
This video is amazing! Thank you for posting
Awesome video, very thorough and helpful. thank you.
Glad it was helpful!
Thanks for watching and the kind comment
My jockey wheels wore out so I bought a whole new chain tensioner. Very easy to install and inexpensive.
Thanks for watching / commenting again
Yes - they are tough nylon, but do wear out (especially when dirty as it makes a nice grinding paste)
Maybe we should make a "how to change your jockey wheels" - a nice easy one (as you said)
brilliantbikes you’re welcome and thank you for the great videos. And I think that making a video on how to change it would be great!
Thank you for sharing your videos and skills
Her presentation style reminds of Watch with Mother when I was a kid in the 60s. I'm expecting Bill and Ben to turn up any minute.
😂 thanks I think!
Very helpful thank you
Thank you for watching!
Tensioner cleaned (in the part washer, not the sink!) chain pusher removed, cleaned, lubed and replaced, and dog leg bolt loosened a little to promote movement... and it's still struggling. I wondered if it was struggling because it's been stored with it in '-' position, causing the spring to loose some of it's strength? Ever heard of that happening?
Thank you. This is really helpful and so well explained and presented. My wife has a new sparkly Purple Brommie which she has named " Jennifer ". There were intermittent problems with the derailleur. When we took it in to the LBS for its post sale 3 Month check up the technician found out that the gear shifter mechanism on the handlebars was binding internally from time to time. Apparently it is not uncommon with the new style shifters.
A bit of wet and dry and some lubrication and it is working as it should.
As an aside, I'm finding this series of Video's extremely helpful and informative. From the feedback I can see that I'm one of many so I wondered if you have considered running a Brompton specific maintenance workshop day/ weekend? There may well be an unmet demand, especially if a Pub was involved at some stage :-)
Thanks for watching
We hope that your wife enjoys her adventures with Jennifer
Next Friday - 6th Dec 2019 - we have our village Christmas ‘extravaganza’
Based on your feedback we are going to try a workshop for wheel removal / installation on a Brompton to see how that works out (even if no - one attends, as a practice at least)
If you are able to get to CHOBHAM - come and say hello - we have good local village pubs!
Thank you. This video is really helpful!
Excellentes Videos,très didactiques.Thank you very much
Another useful and great video.
Brilliant, as your Channel name👍🏼
Thank you so much, and thank you for watching!
Excellent film. Thanks. Are you planning on doing a film on various pedals?
Thank you for watching and the kind comment
We can cover pedals - what would you like to see?
Could you explain how attach the spring and cable area together? I know a person who’s gears aren’t changing. Thanks for the useful videos!
Helpful video. Brilliant Bikes is a very good retailer. I buy all my Brompton parts from them.
Could you make a tutorial video how to setup and replace the achorage, please 🙏🏼
Thank you ❤
And thank you for watching!
Cleaning bike parts in a nice kitchen sink with a natural degreaser actually cleans the sink very well.
Great video as always :) However after following the steps, my issue actually turned out to be cable tension.
very comprehensive video! Do you have any video on the types of crank n BB that fits Bmt?
plis give a clear picture or video about connection and instalation of Cable Anchorage and Chain Pusher, i wanna assembly but i dont know how the wiring and connection. because this part is fully disassembly from the market. tks a lot!!
Hope that I can buy that bike someday !!! That's my dream bike! If I have that just like I have a mini copper in the house
We agree they are such lovely bikes, they always make us smile when we ride them, or when they are sat in the siting room 😀
Thank you for watching
Brilliant!
Thank you.
one other issue i have found is that the housing for the shifter (new style) on the handlebar can create issues if its casing screws are done up too tight. It seems to limit the free movement of the shift lever, so if still stuck, i recommend trying just ever so slightly loosening those to see if it helps?
Thanks. Need to try those, bur was wondering if prob could be spring losing tension over time? My Brompt is 15+ yrs old and its still the original springs assembly. Worth a try?
Got me out of jam today thanks
Phew! Glad it helped! Thanks for watching
Good video
Thank you so much for watching 😀
Thanks you so much!
Thank YOU so much for watching and your kind comment
Hi ! Thanks for you explanations. Didnt you inverted low gear and high gear in your explanations ? When you "Switch to low Gear" according to you AT 5:51 we see the chain tensioner goes down, wich mean more tension, therefore bigger gear and then HIGH gear right ?
I tend to find chain pusher issues are normally cable tension and that is adjusted at handlebar. If it isn't that then this is very useful. Still prefer my 1964 Moulton F Frame though 😜
Do you have a video showing how to remove/replace the gear cable to the Derailleur?