Originally Posted by
berlinonaut
You STILL didn't get it: You do not have to do that. The OLD grips (original width) will fit (but tight). WIDER grips (like the 2017 Brompton ones or Ergons with full width) won't (on the old pre 2017 M-bars). LESS WIDE Ergons will fit, even with bar-ends, but with bar ends probably your hands will feel a bit cramped.
And the only reason I am posting this is because you do FALSE CLAIMS over and over again, oubviously out of pure ignorance and thus lead people to wrong assumptions. And in opposite to what you say I have mounted them on the old M-bars testwise out of curiosity. But I ride other combinations of bars and levers on my Brompton in daily life.
So if you do not want to be annoyed stop posting false claims - should be pretty easy.
Make up your mind, will you have less space for the old shorty grips, or will they fit? Based on your original assessment I surmised that my small hands would be on a grip trimmed a bit to make room for a new-style shifter, and I'm telling you that's not enough grip left to make the ride enjoyable. So pick a damn position and stick with it, smart guy.