Originally Posted by
djetelina
The ABUS granit x-plus is a pretty tough u-lock for sure. To help explain the shearing action of a bolt cutter as related to the shape of the target (chain, shackle, u-lock, cable) I would like to submit the following two (2) images:
Yes, the trapazoidal target has a very large surface contacting the cutter blade. Making it more difficult to initiate the "shearing" action, which a bolt cutter depends on to make its cut. When it comes to mechanical stuff, the Germans and Austrians are some pretty crafty engineers...
Thanks mate! Now I have a better understanding.
It seems that the polygonal approach will give a higher likelihood for the slippage of the bolt cutters if it were already locked onto the vertex of the shackle...