"World Cycling" Sigma Sport
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About Sigma Sport - "Sigma Sport represents German technology at its highest level, combining innovative design with precision engineering."
Some cycling computers can display a power reading, usually in watts. They usually require a separate sensor - in some cases a special hub or crank arm. A few will estimate the value based on speed, cadence, rider weight or other data. "Optional" means it can read from a separate power meter or sensor. "Included" means it is calculated by the computer or includes the neccessary sensor.