I'm currently on the lookout for some nice square taper cranks (not for a Brommy) and these look pretty good, can't see that there's anything that actually makes them Brompton specific.
Fitting a pair on a project bike as we speak, light, no doubt, but not for me. 10nm and the crank bolt sheared, so currently got to get that drilled out... superlight stuff is fancy, but it’s certainly no where on the level with Brompton stuff that’s generally suitable to last the distance
Has anyone tried these 'Brompton' cranks from China via ebay, https://www.ebay.co.uk/itm/Bicycle-square-Crank-for-Road-Brompton-Folding-bike-BCD-130mm-CNC-Made/263842745284?hash=item3d6e40cbc4:m:mmTkUmYoAg15DUfRHu8DvrQ ??
I'm currently on the lookout for some nice square taper cranks (not for a Brommy) and these look pretty good, can't see that there's anything that actually makes them Brompton specific.