I managed to do this on my P-Line too with the same rings (17 and 21). On my T-Line I used the 20 teeth ring instead because the 21 did not work. This info may help you.
Thank you for sharing this. I would like to try this with my T-Line. How did you remove the screw or bolt of your 9£ casette to get the rings with 17 and 21 t?
Have you had any issues with the derailleur struggling to change up to the larger 2 cogs (1st & 2nd). I’ve just bought a P-Line myself and agree the gearing isn’t suited to steeper hills. Like you I think factory 3rd & 4th are fine though. So glad I got the P-Line though especially comparing the weight with a C-Line. Thanks
@@NottinghamshireMadness Hi Andrew, I tried the 98 chain link but, It 's too tight and can't shift at the 21t sprocket. I don't know if i did mess up adjusting the gear🤣
@@07Mr.Yoso21 Put the link back in with a quick link, I'm away at the moment but when home I'll count the tanks in my chain but I would think all P lines come the same!
@@NottinghamshireMadness my chain ring is 44 but i can't set the gear properly. I also tried the 40 chainring with 11,13,17,21 94links no luck at all gear is not properly set keep stuck at 21t not sure if my 94 links is too ahort😒
Good video. Did you just change the front the front from 50 to 46 and then change the back ones to the different sizes then? Did you alter the chain length at all when you changed it all?
I started trying a 44T Chainring but it was too low geared in 4th, 46T was good so I then set about lowering 1st and 2nd to increase the range of gear's
@@NottinghamshireMadness Thank you. What size sprockets did you end up with in the back then? Also do you have a link for the 46t chainring? Thanks. Ps - what’s it like on the hills now in the lowest gears?
Just a wider range of gear ratio's. The P-Line is know for not having a range of gears much different from the three speed, I'll be doing a comparison with the three speed soon
@@NottinghamshireMadness thanks for reply , you would of thought Brompton knew this also and after putting together the time into the new P- line with the new design features that they would of put a thought into the gears they even put time into the derailleur, it’s like they have the clock on new things and when the alarm sounds they drop thoughts .
Hi Andrew from a very hilly Somerset! Guess it’s me but I’m confused. The title of your video (excellent by the way as are all the others which I’ve discovered as a recent P-Line owner!) states 11, 13, 17, 21 and yet I think you say during the video you retained the 15? Have I got that wrong? Either way what four sprockets have you ended up with? Regarding the cassette you bought 1) assume it has to be nine spline? 2) will any speed do i.e. 7, 8, 9 etc or does it have to be an 8 speed to achieve the correct sprocket ‘thickness? 3) going to a 21 assume you had to fit a new chain - apologies did you say? 4) guessing the derailleur copes ok with the additional teeth? Once again really enjoy your videos - it was 5 month review of the P-Line which persuaded me! - and apologies if I’m asking things you explain. Cheers. Ian
Hi, I said it wrong in the video, I just used the 8 speed as the 9 had the same sprockets I used 17 and 21. The chain is one link shorter as I use a 46T chainring, there are no problems with the derailleur changing gear , I would like to try a 22T sprocket but it could be too tight with the shifter. The sprockets are 1.9mm thick, I don't know about the 7 speed sprockets Thanks for your comments and watching
Hey there Andrew! I was thinking of doing the same. Any chance you could share the ebay link for the same exact cassette you took apart? Also how did you take the pins out? Thanns in advance!!
They have gone up in price, but still worth it! 8 speed www.ebay.co.uk/itm/125418141230?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=7fDLuT4MSoq&sssrc=2349624&ssuid=4aeeGuHwQ4y&var=426435991313&widget_ver=artemis&media=COPY
Excellent, thank you! I had that same exact one saved, thinking that might be it. Were the screws easy to take out or did you have to take them out with a hammer?
Btw, I like your videos, you inspired me to get a P line. I’ve a C line that I love but I’m finding it too heavy to carry and inherently more difficult for climbs.
Thanks for this, I was considering doing similar. But the default cassette and chain are technically 10 speeds ( just shrunk down ). So I worry that using an 8 speed cassette may give you issues ?
This is why I never bought a brompton. They cant get their gearing right. They think everyone lives in flat places like Holland. I needed a folding bike that could take on any hill. Thats why I got the Tern Verge X11. Its the king of hill climbing for folders.
![Explaining Brompton Gearing - [Including P & T Line]](http://i.ytimg.com/vi/7uVwMx9OZ94/mqdefault.jpg)
![Lp. Сердце Вселенной #60 РОЖДЕНИЕ ЛОЛОЛОШКИ [Финал] • Майнкрафт](http://i.ytimg.com/vi/YoR0pAV9FVQ/mqdefault.jpg)
On older Brompton s some had 2 speed on cranks made by Schlumpfdrive very clever mechanical bit of kit test roden in Exeter up some very shep hills
It would be interesting to see if you could fit the 4 speed cassette to the 3 speed hub gear wheel.
I have thought that but I try to keep things simple with obtaining components.
Thanks for watching and your comment
I managed to do this on my P-Line too with the same rings (17 and 21). On my T-Line I used the 20 teeth ring instead because the 21 did not work. This info may help you.
Thanks for the info
Thank you for sharing this. I would like to try this with my T-Line. How did you remove the screw or bolt of your 9£ casette to get the rings with 17 and 21 t?
Mine had three three point screws, I managed to undo them with a three point screwdriver
@@NottinghamshireMadness Thank you very much for the answer
Have you had any issues with the derailleur struggling to change up to the larger 2 cogs (1st & 2nd). I’ve just bought a P-Line myself and agree the gearing isn’t suited to steeper hills. Like you I think factory 3rd & 4th are fine though. So glad I got the P-Line though especially comparing the weight with a C-Line. Thanks
No the derailleur is good. The P-Line is a cracking bike and az you say much lighter.
Does this configuration help significantly on the Notts hills?
Yes it's very much suited to the Nottinghamshire hills
Hello, just want to asked how many chain link should i used on that set-up please ( 11,13,17,21 Cassette and 46t or the 44t ) Thank you
I took one like out, good for 44 and 46, I found the 44 a bit too low geared at times but I do sometimes take it with me
@@NottinghamshireMadness Hi Andrew, I tried the 98 chain link but, It 's too tight and can't shift at the 21t sprocket. I don't know if i did mess up adjusting the gear🤣
@@07Mr.Yoso21
Is that with the 46T chainring?
@@07Mr.Yoso21
Put the link back in with a quick link, I'm away at the moment but when home I'll count the tanks in my chain but I would think all P lines come the same!
@@NottinghamshireMadness my chain ring is 44 but i can't set the gear properly. I also tried the 40 chainring with 11,13,17,21 94links no luck at all gear is not properly set keep stuck at 21t not sure if my 94 links is too ahort😒
Good video. Did you just change the front the front from 50 to 46 and then change the back ones to the different sizes then? Did you alter the chain length at all when you changed it all?
I started trying a 44T Chainring but it was too low geared in 4th, 46T was good so I then set about lowering 1st and 2nd to increase the range of gear's
@@NottinghamshireMadness Thank you. What size sprockets did you end up with in the back then? Also do you have a link for the 46t chainring? Thanks.
Ps - what’s it like on the hills now in the lowest gears?
11,13,17 and 21. The changing is a Stronglite 46T 130 bcd, I just used Google ebay or amazon as prices vary,
Can I ask what did the original set up not give you in your opinion that changing those bits did give you ?
Just a wider range of gear ratio's. The P-Line is know for not having a range of gears much different from the three speed,
I'll be doing a comparison with the three speed soon
@@NottinghamshireMadness thanks for reply , you would of thought Brompton knew this also and after putting together the time into the new P- line with the new design features that they would of put a thought into the gears they even put time into the derailleur, it’s like they have the clock on new things and when the alarm sounds they drop thoughts .
@@KavanOBrien
Possibly but as with all top end bikes one hat doesn't fit all!
@@NottinghamshireMadness Maybe if they had a fez it would of happened just like that.
@@KavanOBrien
Thanks for the ☺
Hi Andrew from a very hilly Somerset! Guess it’s me but I’m confused. The title of your video (excellent by the way as are all the others which I’ve discovered as a recent P-Line owner!) states 11, 13, 17, 21 and yet I think you say during the video you retained the 15? Have I got that wrong? Either way what four sprockets have you ended up with? Regarding the cassette you bought 1) assume it has to be nine spline? 2) will any speed do i.e. 7, 8, 9 etc or does it have to be an 8 speed to achieve the correct sprocket ‘thickness? 3) going to a 21 assume you had to fit a new chain - apologies did you say? 4) guessing the derailleur copes ok with the additional teeth? Once again really enjoy your videos - it was 5 month review of the P-Line which persuaded me! - and apologies if I’m asking things you explain. Cheers. Ian
Hi, I said it wrong in the video, I just used the 8 speed as the 9 had the same sprockets I used 17 and 21. The chain is one link shorter as I use a 46T chainring, there are no problems with the derailleur changing gear , I would like to try a 22T sprocket but it could be too tight with the shifter.
The sprockets are 1.9mm thick, I don't know about the 7 speed sprockets
Thanks for your comments and watching
Many thanks for the reply.
Would it be possible to go up to 23t for the largest sprocket?
I don't think it will, what chainring do you have?
@@NottinghamshireMadness I have the stock 50T chainring. I'm constantly spinning out on the flats though, so getting a smaller one would be an issue.
@@marcc.8185
I guess you could a 23t, I did try on the 2 speed but it wouldn't clear the chanstay and I didn't want to grind it down until it cleared
Do i need to change the chain if i upgrade my pline chainring from 50t to 54t?
I took out one link, keep it with two spare quick links for if ever you have a chain problem
Hey there Andrew! I was thinking of doing the same. Any chance you could share the ebay link for the same exact cassette you took apart? Also how did you take the pins out? Thanns in advance!!
They have gone up in price, but still worth it!
8 speed
www.ebay.co.uk/itm/125418141230?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=7fDLuT4MSoq&sssrc=2349624&ssuid=4aeeGuHwQ4y&var=426435991313&widget_ver=artemis&media=COPY
Excellent, thank you! I had that same exact one saved, thinking that might be it.
Were the screws easy to take out or did you have to take them out with a hammer?
Btw, I like your videos, you inspired me to get a P line. I’ve a C line that I love but I’m finding it too heavy to carry and inherently more difficult for climbs.
@@alexandersommer6764
They screw out easily, they have a funny shape head but were not tight.
@@NottinghamshireMadness thanks Andrew! Already ordered, I’ll be looking to pair it with a 58t chainring. ;)
Thanks for this, I was considering doing similar. But the default cassette and chain are technically 10 speeds ( just shrunk down ). So I worry that using an 8 speed cassette may give you issues ?
I don't know the difference, these are 1.9mm same as the Brompton
This is why I never bought a brompton. They cant get their gearing right. They think everyone lives in flat places like Holland. I needed a folding bike that could take on any hill. Thats why I got the Tern Verge X11. Its the king of hill climbing for folders.
But it isn’t a Brompton. I love the tinker factor and it’s great British Engineering
No its better.