Power meters of this type can also be single or double sided.
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This will depend on how you intend to use it, your bike, your bike placement options, your budget and if you want to used it with more than one bike.
Currently, power meters can be placed in five key areas of a bike.
It also means your power output can be a bit lower if your drive chain is very dirty.
Bottom bracket systems can be accurate and low maintenance.
Power measurement will be slightly lower here than on a pedal or crank system as you’re measuring what is left, post drive train losses.
Most commonly, power meters use strain gauges that deflect slightly when a force is applied.