I would use a mini lock that can fit on the triangle and through the wheel of the bike. Then take a cable to the front wheel threaded through the U-lock. For extra security, your can also use locking skewer for the front wheel.
Originally Posted by
Adroitly
Will the mini U-lock be able to lock the frame and the rear wheel at least?
That will depend on your bike. I was able to get a mini u-lock through the frame and the wheel only if I rotate the wheel into the perfect position to do so.