fitted a bb7 and rotor on the front of my genesis day one 20 ,never been happy with the promax that it came with for stopping power,the rear is fine.Rode round and round the empty sports centre car park to test and settle it in .WHAT'S THAT DOUBLE CLICKY NOISE ! !?? well after all I could think of to find it ,seating of caliper ? bearings?pad space?watch the park tool vid again ,more tea ,fag on doorstep...you know when a tyre has been moulded and there are tiny little thin stalks of rubber left sticking out of the tread from the injection process........they are just long enough to tap a mudguard and do your head in...nipped back with nail scissors in 2 min ...The brakes are fine,and sunday dinner tastes better