Hi all, I had a CatEye HR-10 which worked fine until it went mad and started giving me a resting heart rate of 200. Replacement supplied. I set up the replacement with the same correct profile perameters (age, height, honest weight) as before. Now, I have been riding the same route since January, to begin with the Petersfield Road hill was a bit of a sod and would put me above the optimum zone, now I fly up it. I've knocked my time down and generally don't have to work too hard except for one hill... But the new HRM insists that I am way above the optimum zone, and working too hard. I have no idea why this should be unless the first one was always wrong, or I have another faulty unit. I thought the optimum zone was fairly easy to ride in, so why does my gentle pootle come out as though I've been climbing Alps? I have tried upping the exercise schedule setting in case this was because I had got a little fitter, but no difference. Me puzzled.