Operation Manual

10 | P a g e
4.2 Sensor Lock nuts and wrench
FOBO Bike sensors are tied to a FOBO account after installation. They are not re-
usable or transferable without the owner releasing them from his/her FOBO account.
This is a theft deterrent feature to discourage theft.
As an additional anti-theft feature, all FOBO Bike package comes with lock-nuts
and a special wrench. FOBO Bike‟s functionality is not affected if you do not use
the lock-nuts.
The lock nuts and wrench are made of custom engineering plastics that can
withstand road salts and common automotive chemicals (gasoline, engine oil, bike
wash shampoo, etc).
In order to use the lock nuts, you must first install the lock nut to the tire valve (with
the bump facing tire rim). Screw in the lock nut all the way down and ensure that
there is still a minimum of 5 thread count on the tire valve for the sensor unit to be
screwed on. If there is insufficient thread for the tire sensor, it may lead to air
leakage. A solution for this would be to change the tire valve to one with a longer
thread. Next, screw in the tire sensor unit until it is reasonably tight. Then use your
finger to unscrew the lock nut outwards (i.e. anti-clockwise) until it pushes against
the bottom of the sensor unit. Use the wrench to tighten the lock nut. The resultant
friction force will make it difficult to remove the sensor unit without loosening the
lock nut. For rubber valves, hold the valve stem with one hand and tighten the lock
nut with the wrench on another hand. This is to avoid the rubber valve from twisting
making it unable to tighten the lock nut.
WARNING: Do not Apply too much force to tighten the lock-nut. You may
face difficulty to loosen the lock nut later on especially for rubber valves that
typically doesn’t stay firm on the tire rims.