Originally Posted by
DropBarFan
I had the idea, last week, of aluminum U-lock. Useless, of course, vs someone with portable power tool but steel not much better that way either. Once took heavy U-lock on mountain tour & could feel the weight.
They've been commercially available for quite some time:
Robot Check
Not very secure if someone actually takes a hacksaw or even a Swiss Army Knife to it, but I presume the idea is that most thieves will avoid bikes with U-locks and instead go for the ones secured with cables. Don't know how many bike thieves take the time to check the make and material in each U-lock.