How do they measure rider power output?

Globalti

Legendary Member
First came across this in the Michael Hutchinson book and have now seen it in relation to the Tour. Is it done by a speed/pedal RPM comparison?
 

chris42

New Member
Location
Deal, Kent
There are 3 main methods
SRM Cranks which have a strain meter (don't know the correct term) in the bottom bracket.

Power tap.
Similar to SRM but located in the rear hub

Polar
Which is the least accurate which works on the movement of the chain and the cadence I think.
 
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