The 2INpower and INpower are both spindle-based power, with the difference being that the 2INpower is dual-sided and rechargeable, whereas the INpower is single-sided and powered by a AA battery. The 2INpower has strain gauges in both the crank arm and the crank spindle for precise, independent measurements.
The INspider, on the other hand, is spider-based, where the strain gauges are in the spider itself. The INspider is compatible with all of our current model cranks, including the ALDHU and VEGAST.
Additionally, our bundles include a discount when compared to purchasing individual components. The price shown with each bundle reflects the discount already accounted for.