Store manager Tess posted this alert to bike owners on Facebook today:
My best suggestion is to use the smallest lock available that still allows you to lock your bike. Between your bike and the post, there shouldn’t be much room left inside the lock; the less room, the less chance someone has of jamming a pry bar into the U and attempting to force it open, damaging your bike in the process.
Heavy-duty chain locks are also a good suggestion, but definitely weighty and more expensive, plus they’re more awkward to carry and use. But Kryptonite makes a number of high-quality, case-hardened steel chain locks, and the flexible nature of the chain makes it nearly impossible to use it as leverage against itself.