Bill Kirwin

So after a few trips down the rail trail and back I decided that I didn’t really want to trust A-GPS from my iPhone 5S to deliver accurate speed and distance information to Cyclemeter.   After all, if I’m going to ride forty-odd miles and then analyze the ride data later, shouldn’t it be accurate?  So I needed a speed sensor.

Cyclemeter is compatible with a wide range of devices.  Given my application, I decided to pick up a Blue SC from Wahoo Fitness.  This tracker will not only do speed, but also cadence.  Initially cadence wasn’t important to me, but after reviewing ride data for a few short runs, I’ve found it to be useful in improving my pace in a few spots that have rough asphalt or hills. 

The Wahoo Blue SC includes the main unit, a magnet to attach to a spoke for the speed sensor, and a magnet that slips onto the crank to measure cadence. 

 The devices look something like this when installed: 

 Here it is on my bike: 

 Unfortunately the magnet on the crank is pretty easy to kick off the bike apparently.  Mine seems to have gone missing at about the 12 mile mark: 

 I’ll have to contact Wahoo Fitness for a replacement, but in the meanwhile, I’ve got a magnet pulled out of an old hard disk affixed to the back side of the crank.  In a very brief test, it seemed to deliver the desired result.  This is a lot less bulky than the magnet that came with it, so if I’m lucky, it won’t go flying off at speed. 

 I’ll have to let you know!