Originally Posted by
simsles
A bit late now I admit, but one of the many advantages of a folding bike is that you can generally fold it up and take it with you into a building.
The thing is, generally, you can't with most folding bikes. That's why I've been locking my Downtube outside and why I'd like to sell it.
The Brompton, the Strida, the A-bike, and the Carryme are really the only folding bikes you can generally take with you everywhere, and even at that the Brompton and the Strida are pushing it.
Originally Posted by
simsles
Taking off any easily removed parts such as seatpost, lights, computer and pedals (if MKS Q/D pedals) is the next best option. Otherwise perhaps, fold it up before locking it to something solid with the best lock you can afford.
I think the next best option is taking the subway or maybe even driving. Taking the whole bike apart just to go inside for an hour or two is the last thing I want to do.
And how will the best lock I can afford do? No matter how it's locked with some basic tools any amateur bike mechanic should be able to strip a locked up bike of everything except the wheels and whatever part of the frame is contiguous to the rear triangle (basically everything that isn't a loop or welded to a loop).