Look X-Track Power Manual Del Usuario página 23

EN
LED COLOR CHART
Charging
Charged
Waking up
Awake – waiting for pairing
Pairing
Paired & communicating (pedal-pedal)
Low battery
Ready for firmware update
Firmware update ongoing
Firmware update failed
(< 30%)
(< 60%)
(< 100%)
Every 5 seconds
Every 10 seconds
POWER DETECTION ACCURACY
In normal usage conditions, the pedals have an
accuracy of +/-1% compared to an absolute factory
reference.
A comprehensive computer model of the pedals
has been developed to study the transmission of
measurement data through the pedal system to the
power value. This model has been calibrated using
experimental data and used for cross-validation of
pedal accuracy.
To ensure maximum accuracy, please follow the
steps below:
• Ensure that the pedals are tightened to 30-40Nm
on the cranks. Pedal tightening below 30 Nm
reduces power measurement accuracy. Tightening
pedals above 40 Nm can damage the pedal or
crank threads.
• Make sure that the crank length is correctly entered
into your bike computer/sport watch based on the
bike used. The value set in the application will be
overridden by the one entered on your computer/
watch. An increased value of 2.5 mm (for example,
172.5 mm while the cranks measure 170 mm) will
result in a power overestimation of 1.5%.
• Immediately after installing your pedals on your
bike, perform a few short sprints (1 to 3 times, 3
to 5 seconds each) to stabilize the pedals on the
cranks. During this exercise, the zero value of the
pedals will change. It is important to recalibrate the
pedals after this exercise. It is not necessary to redo
these sprints before each ride, but only once after
installing the pedals.
• Pedal calibration must be done on your bike
computer before each ride. Although the zero value
is quite stable, it is important to ensure it is correct
before riding. Skipping this calibration can result in a
measurement error of +/-2%.
• If the pedals have been transferred from one bike
to another, put them in sleep mode or reset the
"installation angle" from the LOOK application. The
pedals automatically determine their installation
angle each time they wake up. If the pedals do not
go into sleep mode after being moved from one bike
to another, they will not recalculate this angle, and
power-related data will be incorrect. Don't forget to
also perform a few sprints and recalibrate.
Please note that the consistency of power data
measured by different power sensors depends on
many factors:
• The type of power sensor. A sensor located "closer
to the legs" (pedals, cranks) will physically measure
higher power than a sensor located "lower" (bottom
bracket, hub). This is because there are small power
losses along the bike components. The highest
mechanical power will be produced/measured at the
pedals, then it will decrease as it passes through the
cranks, spider, chain, cassette, hub, and the trainer
(in that order).
• Parasitic efforts/measurements. Some cranks, for
example, are sensitive to torsional efforts (the effort
that twists the crank instead of applying torque to the
chainring). The same effect can occur with power
sensors installed on the crankset, as they may be
subject to slight torsional efforts depending on the
chainring used. If these efforts are not perfectly
taken into account by the measuring device, it will
result in power overestimation or underestimation.
For pedals, The primary parasitic measurement is
generally due to the position of the force application
point on the pedal (the effective 'Q-factor' of power).
LOOK pedals are highly effective in accounting for
this parasitic measurement, but other sensors may
be more affected.
EN