Sadly, Magura black pads are best used for throwing at people in the cinema! As a brake pad, they are about as much use as using a strawberry lace as a cable for an avid BB7. Unless of course your name is Rowan Johns, and you missed the bit where we were all told 'you need GOOD back brakes' Really though, they dont work overly well. You get a load of modulation with them, and they can be OK for a front brake, but generally, Id advise you keep clear of them! If you must use them, avoid using them on a grind, they just turn to dust! They will be OK with copious amounts of tar, although any pad will work with tar really! Al