I guess this is the primary PM technology discussion thread?
Analysis and Discussion with Garmin and MetriGear about new Vector Power Meterhttp://www.dcrainmaker.com/2010/09/anal ... n-and.html
he small case he pulled from his pocket showed the evolution of just the last year’s worth of designs, and showed a pretty significant decrease in size – by probably close to 50%. It was also significantly smaller than the Look/Polar final prototype axle.
The silicon based design is much more resilient to changes in environment than typical strain gauges used today, thus like the Polar system it will be largely immune to needing constant calibration. However, Clark did note that they are looking into the ability to allow users to zero the the unit from standard ANT+ head units.
The design will include two pedals and two transmitter units – with a total system target weight of under 50g. The transmitter units will sit just on the outside edge of the crank arm (closest to shoe), nearest the spindle and will attach directly via the spindle threading. In the demo he showed me he used the example of the current Garmin ANT+ foot-pod as about the same size and internal electronics as the Vector system.
So it sounds like they are shooting for 50g in addition to the weight of the pedals. That's huge compared to the weight of a PT over a normal rear hub.
Also goes on to talk about some of the stress and life testing they done. Future of ANT+. Price.
EDIT: beaten by Ritterview.