The guy in the 50+ jersey
Join Date: Aug 2002
Location: Davidson, NC
Bikes: Specialized S-Works Roubaix, Litespeed Tuscany Road, Specialized Allez Epic lugged carbon frame Road,Giant Anthem 29'r, Klein Hardtail
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Problem with Garmin 705 Cadence / Speed sensor
I am having problems getting the cadence sensor on My Garmin 705 to "pick up" the magnet consistently on the crank arm on one of my bikes. I'm currently set up on two different bikes, a Guru Carbonio Ti and a Litespeed Tuscany (1998 vintage).
The Guru works fine, it's the Litespeed that seem to have the issue. The sensor is new, and picks up the wheel magnet with no problem. It will sense the crank magnet sometimes, but not consistently enough to get a reading on the head unit.
The chainstays on the Litespeed are curved and I'm using a SRAM Rival crank, which is slightly machined out on the backside of the crankarm. In order to get the sensor to pick up the magnet at all, I have to angle the sensor out away from the wheel. This means that the magnet is VERY close to the sensor only at it's top. I've tried different magnets from the old parts bin, shimming the magnet (which still didn't push it out enough to matter), changed the placement of the sensor on the chainstay to further back, which helped to straighten the angle some, but apparently not enough.
Wondering if a stronger magnet might help, but I'm open to any suggestions...