I wonder if anyone could advise on this please. I have a 4 month old Giant Defy and have ridden about 800 miles on it. It feels good to ride and the brakes and gears work well. A while ago I noticed a clicking that sounded like a double click every second revolution of the pedals, but it went away after a few miles. I recently had the bike serviced and told the mechanic about this. When he returned my bike he said he thought the clicking was probably my foot knocking a cable end, which had lost its cap and become frayed, and knocking it against the mech. He tidied this up and put a new cap on. However, I have since ridden it 3 or 4 times and the clicking is now worse, it is now like a constant rattle, but again disappears after about 3 miles, it is as though it is like a car that sounds rough until the engine gets warm then runs smoothly. It happens when pedalling and freewheeling, but seems to reduce when I use the rear brake. I thought it might be the spokes, but the mechanic should have tightened them when he trued the wheels (which he said he did), and when I have checked them there are no loose ones. I suspect it might still be something to do with the spokes though. The wheels are Giant PR2s, which have had some mixed reviews, such as those in the link below. I don't want to go through the inconvenience of taking the bike / wheels to different LBSs or mechanics if I can avoid it by getting more of an idea, as it might not be the spokes, and for the same reason, I don't want to go to the expense of just changing the wheels. http://forums.roadbikereview.com/giant/giant-road-wheelsets-info-weights-263876.html Any help / advice gratefully received, thanks.