Originally Posted by
berlinonaut
If you have a M-Brompton made before 2017 and you want to use the handlebars that are supplied for the M from 2017 on you can simply use them on your existing stem but will end up with the grips being a couple of cms lower than before. If you want to achieve the same height as before you would have to change the stem to the newer version, too.
This is what I thought as well, curious on why someone informed me that I had to change the stem as well. Ideally, I would like to have the height as I find my hands/wrists hurt after a long ride. Though I'm hoping that ergo grips might alleviate that.