wheels and tyres page 2
DESCRIPTION
Wheels and tyres page 2TRANSCRIPT
Wheels and Tyres
Page 2
A common rim in use today is
the one piece rim. The one
piece rim has design features
made as part of its integral
design regardless of the
material it is made from.
The wheel has to allow the tyre
to seal against it to allow the
tyre pressure to be maintained
and it has to allow easy fitment
and removal of the tyre.
Label the wheel rim below
Well
Valve
Taper
Flange
What is the purpose of the well?
• The well is the deep part in the middle of
the rim, it is there to enable the removal
and refit of the tyre.
• The bead of the tyre can’t stretch over the
flange so one side of the bead is pushed
into the well to allow the tyre to be
removed.
What is the purpose of the flange?
• The flange is there to stop the tyre from
coming off the rim
What is the name given to this type
of valve?
• It is known as a Schrader valve
What unit of measurement is the
wheel rim diameter most commonly
measured in?
• Rim diameter is commonly measured in
inches
What is the measurement shown
by the letter J?
• The letter ‘J’ refers to the rim flange height
What is the unit of measurement
that is used to measure tyre width?
• Tyre width is commonly measured in
millimeters
Some manufacturers now have
an extra safety design built into
wheel rims, what are they?
• Some rims have ridges made as part of
the taper
• They are there for safety, they stop the
tyre coming off of the rim in the event of a
puncture.
Add them to the drawing of the rim
opposite.
Questions
• What is the purpose of the well of the
wheel rim?
• What is the purpose of the taper?
• What is the rim diameter measured in?
• What is tyre width measured in?
• What is the difference between a normal
rim and a safety rim?
Answers
• To allow the tyre to be removed and refitted
• To allow the tyre bead to seal tightly against the rim
• Inches
• Millimeters
• Safety rims have extra ridges in the taper part of the rim to stop the tyre from coming off of the rim in the event of a puncture occurring whilst driving.