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@Smallfurry
Been quite happy with my powercal. I have the 3s average displayed. It could do with a little more, but the next option is 10s. But its realtime usuage isnt meant to be great. I also have to add around 25 - 30w to the reading. But I only paid £7 more than I would have paid for a standard HR belt, and I'm just a geeky MAMIL so it does a very decent job IMHO.
One thing I do like to have is TSS. Been using this a lot on the trainer. I kinda hoped with the average results with powercal being so good. I could log TSS from outdoor rides too. But it seems to give far too high a figure. I've put this down to the bigger fluctuations, which lead to bigger IFs.
Just how bonkers is a TSS of 316. For a 55 mile ride, including 6000ft of assent, and a fast 15 mile tempo effort home?