Join Date: Jun 2005
Location: Chandler AZ
Bikes: '04 Bianchi Giro, '05 Bianchi Virata, Electra Straight 8
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Take a look at the Garmin Edge 305. Units are available with HR, Cadence, or both. GPS tracks speed, altitude, %Grade, and other stuff. It can also operate with the GPS turned off for indoor training.
The interference thing may be just electrode contact with the skin. Performance Bike carries an electrode gel (H.S.E.) that has made a world of difference for my HRM. No more wiggy 200+ BPM readings.
There have been several threads on the Garmin unit over in the Road Cycling forum. A little search will do you.
'04 Bianchi Giro
'05 Bianchi Virata
'08 Electra Straight 8 Cruiser