COATS Extended Mobility (EMT) RunFlat Tires - Manual (Page 9)

The Objective of this Section:
To provide an introduction to tires that remain usable with little to no air pressure inside the tire
and the necessary changes to the mounting, demounting, and inflation procedures for these tires.
Safety Issues Related to this Section:
This manual is intended to supplement the Operator’s Manual provided with your tire changer
only and is not meant as a replacement. ALL safety issues contained in your original Operator’s
Manual remain in effect when changing this type of tire. The safety information contained in this
manual is to be used in addition to the safety information in your Operator’s Manual.
What is this new technology?
The principle behind this new technology is to provide a tire
that will remain “operable” even with a total loss of air pres-
sure inside the tire, thus allowing the vehicle to be driven for
some additional distance without stopping. These tires will
be referred to as Run Flat and/or Extended Mobility Tires
(EMT).
What is the difference in these new tires?
These tires are manufactured with exceptionally stiff side-
walls. These stiff sidewalls are designed to support the
wheel for limited periods of time without air pressure inside
the tire. Of course, stiffening the sidewalls to this degree cre-
ates problems for the wheel service technician.
How can I tell when the tire is flat?
Because the stiff sidewalls support the wheel in a drivable
posture even without air pressure, it is nearly impossible to
tell when this type of tire “goes soft.” Regular verification of
air pressure inside the tire is critical. Tire manufacturers are
required to install low pressure sensors on the wheels
(inside the tires) to provide electronic notification of low tire
pressure. These sensors transmit their low pressure warn-
ings to a remote readout inside the vehicle.
This low pressure system is available on some new cars, and
will be available on even more models in the near future.
Today, customers can purchase an aftermarket system and
have it installed on their current vehicle. These systems use
either a valve-stem mounted sensor (O.E.M. only), or a sen-
sor that straps onto the wheel (aftermarket & O.E.M.).
How is this type of tire serviced?
As any tire service technician can tell you, the stiffer the sidewall,
the tougher the tire changing. These new tires are so exception-
ally stiff that they require special handling. This special handling
is not only to ease installation and prevent any damage to these
expensive tires, but to help prevent damage to the wheel and the
tire changing equipment. These tires require extra time and
patience to service and to prevent injury to the tire technician. Be
prepared to take your time and not rush the procedures..
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