Hi all. One idea to share would be to put the bike in its lowest gear and remove the seat. It's almost impossible to ride off as proven when a riding mate's mountain was a the point of changing it's ownership. We had ducked into a burger to buy a drink and someone tried making off with the bike over to find herself (yes, it's a her) almost falling off the bike before abandoning it by the kerb. Tried and tested I would say though I have not tried it with my foldie.