Do I need the Speed/Cadence sensor?

Although Garmin call it the "speed/cadence sensor" that name is slightly misleading since the GPS itself measures your speed as you ride. The sensor is needed to measure your cadence (pedaling revs per minute).

However the sensor also measures the speed at which your bike's back wheel is moving. Out on the road this is not useful information, since the GPS measures speed much more accurately, but this feature comes into play if you use your bike on rollers or an indoor wind trainer.

Relates to:

• Garmin Edge 705 with Street Maps and Cadence
• Garmin Forerunner 305 Multi-Sport

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