Here's the latest addition to the bike. A Polar CS200 CAD trip computer. I bought this one as it is one of the few that can measure the usual stuff, speed and distance, aswell as heart rate and cadence. When I was doing my reading up, it's become obvious to me that heart rate and cadence go hand in hand. So, now I've got this I can measure spin speed vs. heart rate vs. distance to try and get the optimal gear for my cadence. I'm going to start logging what I do, let's see if it works. The theory is clear in my head, just got to put my rear in the saddle now and get some miles done.