I've just been over all my wheel nuts (bolts) to check that I can undo them after having four new tyres fitted. It took me standing on a 2ft breaker bar to shift most of them. I re-torqued up to 160Nm (Peugeot recommended?). What is the thinking on putting copper-slip on the bolt shoulders (not the thread). The bolts came free with a load crack when I finally managed to loosen them. Standard steel wheels.