Plays in traffic
Join Date: May 2006
Location: Rochester, NY
Bikes: 1996 Litespeed Classic, 2006 Trek Portland, 2013 Ribble Winter/Audax
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I'm unfamiliar with your bike and fork, but I found that my Delphi 4.0 is extremely sensitive to sensor/magnet positioning. Not only distance, but also where the magnet passes along the sensor.
When I first got it I was frustrated that the thing worked just fine if I held the bike up and spun the wheel, but as soon as I got on the bike, it stopped working. All I can figure is the miniscule amount of spoke deflection caused that problem.
I also found the cadence sensor to be much more forgiving of magnet placement. It seems like all it needs to be is in the same county and the cadence sensor works.
Anyway, I now use a CatEye wheel magnet which is both larger and more powerful, and have it positioned so it spins right between the zip ties and nearly touches the sensor as it spins by.
Also, mine came with a nearly dead battery in the wheel sensor. Try a fresh one even though yours is new.