when front braking, i'm getting a noise like something tapping the alu frame. not had it before, i initially thought it was related to the fact that the brake block pads are in need of replacing, but i can't see any reason why. with the image fresh in my mind of the chap on the club run who had a nasty crash due to a snapped steerer tube, i'm a bit wary now. the noise has only been noticeable since i put new tyres on it the other day. ta in advance.