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can be termed as i) Tire Absolute Pressure minus sea
level pressure, or ii) Gage Pressure reference to sea-level
altitude. With this formulation, Fobo Bike 2 sensor will
read the same pressure value for any given time,
irrespective of altitude (assuming a constant temperature).
This will ensure the correct tire footprint per vehicle
manufacturer‟s pressure recommendation, for all altitude
above sea-level, given a constant temperature.
As a corollary, a tire with a Fobo reading of, say 40 psi at
an altitude of 5000ft, will read the same 40 psi when
driven to sea-level, given a constant temperature. In
reality, it will read higher due to the warmer temperature
at sea-level, and may need some air release if the
temperature difference is great. Tire pressure generally
will increase 1 psi (~7kPa) for every 10 deg F (5.6 deg C)
rise in temperature.
Fobo wishes to highlight the above formulation is for
usage at sea-level and above, and will not be accurate for
use otherwise. In practice, this should not be an issue as
the lowest area on earth will result in an insignificant error
of 0.3 psi (~2 Kpa).
For users who wish to retain „Gage Pressure Reading‟, the
Fobo Bike App has a Gage Pressure, adjusted to local
altitude using cell towers or individual phone barometer if
available.
FOBO Bike 2 sensor units are designed to be robust and operate reliably 24x7 to
provide tire information around the clock. It is designed to be water proof (IP57)
and by our special use of custom engineering plastics, it will be able to withstand
road salts or other common automotive chemicals (petrol, engine oil, bike wash
shampoo etc.).
Our designers have designed the sensors to ensure that there is no air leakage as it
replaces the tire‟s original valve cap. There is no need to screw on the sensor
extremely tight. Apply a reasonable hand twist force to ensure the sensor is securely
installed and should be able to be removed by hand with ease.
Note that the sensor position is fixed during installation. When installing the sensors,
please follow the on-screen prompt of the FOBO Bike 2 App. Do not screw on the
tire sensors until instructed by the FOBO Bike 2 App. After installation, in the event
the tire sensors positions are mixed up, usually after performing a tire rotation
maintenance, you can easily re-position the sensors to their correct position by