I just received my cogs and will install them after I purchase the tools necessary to remove them, ie chain whip and free wheel socket. I decided to keep the 50T OEM chainring on my T-Line and change the rear cogs to 11-14-17-21. The length of my chain currently is 50 main links plus the master link making a total of 51 links. Wish me luck. I hope it changes gears as smooth as yours does.

Thanks for your videos - very helpful. Just bought a P Line electric and 1st gear was driving me mad - killing me on all my local steep hills that I can glide up on my Swytch Brompton 6 speed. Bought a suitable SunRace cassette on Amazon and, like you, substituted 1st and 2nd gears with 21 and 17 tooth sprockets. Great result - thanks again!

Very interesting gear choices. I have been contemplating something similar, I am glad to see it is possible!

It's the stock gearing that's delayed me committing to buying a P-Line, I live in North Wales, my current 6 speed Brompton is great, but would love to modernise to the P-line. I'm thinking what you have achieved with your's could be ideal for me. Thanks very much for sharing your knowledge.

Hello Andrew, Very well explained... I am sure this will help many people in the future... Cheers. Paul,,

Couldn’t be any clearer than that Andrew, great video

Not lucky enough to have a P _line as yet lotteries fault or mine for buying the tickets , but at least got this video one if I get one and two if I change the gearing, so keep the videos coming please , it’s like having my own personal in-house mechanic, thanks again , one of your many greatest fans, take care.

Thanks so much for this! I'm getting my new P-Line in a few weeks. I'll be watching your videos!

Very well explained Andrew....Great stuff 👍#properchap

I like try to ride, and how feel the difference with normal p line. Cheers

Deserved more likes and subscriber one from me👍. Well explained Andrew, I will try to do it again to my P line. Thank you so much👏 Take care.

Thanks for the video! I'm looking at a similar solution. May I ask where you got the 17T sprocket? Thank you!

Thank you for sharing this Andrew. Using parts of an 8 gear cassette as I think you said you have, what are your highest and lowest gear inches?

Have used 22t on the rear 46 crank. Changed the derailleur to a 8t. Now have 48t crank 21t cassette 9t derailleur. Have not shortened chain or lengthened it. Think if you change derailleur wheel it solves problem. Did try 23t but it touched derailleur slightly.

Big fan! South London here. Any chance of some steady cam processing? Find it a bit tricky watching for too long with the camera shake!