The inaugural roadie ride of the season came with a slight hiccup as the powertap (a hub/device that measures the power output as you pedal) was not working. After a little investigation I realized that the batteries in the hub probably needed replacement. I had replaced the battery in the head unit (the little computer that has the readouts for wattage, mileage, etc) but replacing batteries in the hub proper was a new one for me.
Thanks to technology we can look up just about anything on the internet and sure enough there were some instructions out there. The only problem was those instructions were for the newer models and my older wired version of the powertap was not as readily available. It was easy enough to figure it out though.
It entailed removed the rear wheel off the bike and then removing the yellow cap on the non-drive side of the hub. An allen wrench was the only tool needed:
Once removed, it looked like:
Then it was a function of replacing the batteries and putting it all back together. The only trial and error portion of all this included making sure the batteries were set correctly. As you can see on the right side of the hub, it shows a + sign for how to install the battery on that side. I originally tried placing the left battery in the same position but got no transmission to the head unit. Once I flipped the battery so it looked like the above picture, everything worked as expected.
Thanks to technology we can look up just about anything on the internet and sure enough there were some instructions out there. The only problem was those instructions were for the newer models and my older wired version of the powertap was not as readily available. It was easy enough to figure it out though.
It entailed removed the rear wheel off the bike and then removing the yellow cap on the non-drive side of the hub. An allen wrench was the only tool needed:
Once removed, it looked like:
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