Originally Posted by tsl
Sorry, dumb idea.
Beyond the possibility it could damage expensive bits, one could still walk it away quite easily. And it does nothing to prevent a lift-and-carry theft.
Besides, give me a minute and a chain tool and I'll ride your nice Bianchi away leaving your silly little "Dear Diary" lock behind.
Edit: Oh, wait a minute. SRAM rear dérailleur on your Bianchi. Betcha it even has a PowerLink on that chain. No tools required to defeat your lock.
I think you're being a little harsh, the OP was suggesting it as a "slow down the thief because I'm standing somewhere nearby" not "going into the office for 8 hours" lock.
However I am 100% certain that if I used that method I would one day forget it was there, hop on, and inflict some expensive drivetrain damage on my own bike
.