Anyone tried 2 speed to 3 speed conversion on Brompton

[Fastpedaller]

I understand that in order to fit 3 sprockets and 2 spacers where 2 sprockets and one spacer were previously requires 11 speed components - will 10 speed fit ok, or do i need 11 speed sprockets and spacers with a 10 speed chain?

 

[berlinonaut]

I understand that in order to fit 3 sprockets and 2 spacers where 2 sprockets and one spacer were previously requires 11 speed components - will 10 speed fit ok, or do i need 11 speed sprockets and spacers with a 10 speed chain?

As I said before: I did use a 10 speed cassette and a 10 speed chain. Absolutely no issue. See https://www.bikeforums.net/20170010-post8.html

Also Duncan, who invented this hack initially back in 2014, did use 10 speed sprockets. I did mention and link a post with his documentation also earlier in this thread: https://www.evernote.com/shard/s3/sh/4bae9f26-2252-4be9-8229-314d0a13c754/3118242aa4dcc174f4c493cf5828165e/res/133a58c6-bd38-46f2-8a6a-ec61dcdaafe7/2 to 3 Speed.pdf

So no idea where you get the 11-speed thingy from.

 

[Fastpedaller]

So no idea where you get the 11-speed thingy from.

Neither do I I maybe need more sleep?

 

[Fastpedaller]

Update...... I chatted with a friend yesterday who is about to remove his 11 speed cassette and is donating it to my experiment.

 

[TheDoctor]

That's when you use 11 soeed kit for tinkering. When it's free!
10 speed chains and cassettes are cheaper than 11 speed.

 

[Fastpedaller]

Yes indeed. I've measured the chainring teeth width 2.5mm! so no chance even a 10 speed chain will fit. For one extra sprocket I'll have to wait until the chainset wears out (it's a 2007 model) before I pay out for a new chainset, chainring etc, so unless I win the lottery I'll probably give an update in about 10 years.