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Just replaced the entire drivetrain on my Brompton - the first time I have changed the chainring in 6 years. Oops.
Unsurprisingly one of the chainring bolts had fused/rusted together and had to be drilled out.
I finally managed to sort out an annoying creak on the front end - some water had ingressed into the stem hinge. Some GT85 and moving the hinge open and closed managed to extract a lot of rusty brown liquid. Seems fine for now, though the hinge bolts must need replacing eventually.
Finally I stuck some Joseph Kuosac risers on, they are great fun!
Not in overhead locker...unless you've got the cheekiness (and if brazen) to try.
Brompton: 58.5 x 56.5 x 27
Typically, carriers will let you stow a bag up to 55cm tall, 40 cm wide and 20 centimetres deep.