September 18, 2012
The StageONE power meter is
built into slightly modified left-hand crankarms and directly measures power via
a strain gage array, custom electronics, and a special algorithm that filters
out non-applicable forces and interpolates total left-plus-right output. Claimed accuracy is within +/-2 percent.
Claimed weight for the entire
system is just 20g. It adds less than 10mm to the inner profile of the
crankarm. And once installed (with no holes or structural changes required,
mind you), it's barely noticeable with virtually zero effect on a bike's
Since the system is based on
a left-hand crankarm exclusively, it should also be very easy to transfer
between multiple bikes with no effect on the drivetrain adjustment and no
recalibration when swapping chainrings. Users will still be able to retain
power measurement when swapping between racing and training wheels or different
As if that weren't enough,
Stages Cycling claims the StageONE incorporates ambient temperature compensation
to retain accurate readings, it measures cadence without having to install a
separate magnet on your bike anywhere, it transmits data via both ANT+ and
Bluetooth Smart protocols for maximum compatibility with both existing head
units and many popular smartphones, claimed battery life is more than 200
hours, and the standard CR2032 battery is easily replaceable at home.
Stages does not make
its own head unit, and has no plans to do so. So you will have to own an ANT+ bike computer (like a
Garmin 500) or a Bluetooth 4.0 smartphone to read and record power data.
And for those keeping track,
the StageONE is completely manufactured in the United States – even the plastic
casing – with the lone exception of the circuit boards, which are currently
printed in Taiwan.
That feature set would be
impressive for any direct-measurement power meter but that the StageONE is
priced so relatively inexpensively is merely icing on the cake. According to
Stages Cycling vice president of product development Doug Crawford, the goal of
the StageONE is simply to "bring more people into power."
Lots of more pics here
The Power meter market battle is about to get very interesting...
November 24, 2015
June 23, 2015
April 23, 2015