Um. This guy is looking for, I gather, a significant upgrade from his Speed and Boardwalk experience. To enable adjustable handlebars, we're looking at the P8. Which is just is just as flexy, just as squirrely (rather little trail), has the same low-speed fold, and is just as squeaky joint-wise. And I think the Mu rolls poorly. I don't think it's a good pick.

Truth is, there's no good choice for these requirements.

- The Tikit's 16" and may be too flexy.

- The Mu's got issues listed above.

- The Birdy may be too heavy and folds too slowly.

- The Brompton's too squirrely and has almost no non-company customization options.

- The NWT folds too slowly.

If we're talking flex, weight, and customizability, I think the NWT is the best pick here.