Originally Posted by
cyccommute
All of my racks have built in locks. The fork mounts have lock cores that lock onto the fork and the hitch rack I have has a hasp mechanism that covers over the top tube and locks in place.
That said, a cable can be pretty effective. It worked well enough for these 4 bikes that fell off the back of an RV near Devil's Tower
image by
Stuart Black, on Flickr
I couldn't get the bike loose or I'd taken them for what parts I could salvage.
That's quite a bit of rust on those bikes on parts that theoretically shouldn't be rusting... I actually have that same rack as in the picture. I use a cable lock through the two loops on the bottom to lock it to the receiver and a combination of cable + u-lock to secure the bikes to the rack. I only trust that solution for a short period of time in non-seedy places.