I seem to be going through mine pretty quickly - I've had the bike almost 3 months, already had one set replaced after about six weeks, and now I seem to have lost all braking power on my rear brakes, so I'm assuming those are worn through now as well*... Is this normal? * to be fair I haven't had a really good look at the back brakes yet - they look fairly worn down, but I couldn't tell in the light of the office garage whether they had hit 'the line' yet. I adjusted the cable so that the brakes don't hit the rim when the lever is not pulled (the rear wheel spins freely), but hit the rim quite quickly when I pull the brake lever. Problem is, I can then pull the lever hard, and it still doesn't provide much stopping power. I know rear brakes don't stop as well as front brakes, but it used to be better than this, and it's actually quite difficult to get it to slow me down enough when I'm signalling to turn right, for instance.