Originally Posted by berlinonaut

So you did not try it. But once more a strong opinion is worth more than evidence, seems to be a trend... You cannot mount the NEW 2017 grips together with the 2017 shifters on the old M-bar. And possibly not with the old shifters as well. Because the new grips are wider than the old ones. As the flat area on the new bars got a little wider (by ~1cm or so) the new ones won't fit. The old grips should probably still be possible. The old grip area served a lot of people well enough, judging from the fact that more than 500.000 Bromptons have been built and sold that way over the years. I would assume that these customers were not exclusively people with very tiny hands....

What will be uncomfy is new shifters, old bars, Ergon grips with bar-ends and stuff like that. The original full sized Ergon GP 1 grips w/o bar ends will possibly not fit as well (as they are wider and clamped at the outside), other grips will. Therefore I would recommend to try it out instead of claiming to know something that you don't know. And if you are not interested in the new shifters there is not even need to do that.