I got the onguard u lock today but it seems too short to secure the front wheel (it does secure the front wheen on it's own, just) and be secured to a post as well. I will only be using it when it's accompanied with the chain on the frame and rear wheel but I doubt amazon will take it back now all the packaging is ripped.

Is it worth getting a larger u lock to secure around a post while using the chain as well?