Radical Sportscars SR3 XX, Owner'S Manual, Page: 20 / 56

20 QD163-1
4. TYRE MANAGEMENT
The table below shows the suggested running pressures and pressures for race tyres:
o Please note that the starting pressures are to only be used as a guide; conditions on the day will alter
where you should start your pressures. Hot conditions will increase the pressure rise over the same
period of time
o Fit valve caps when running
o
Temperature spreads must not exceed 15°C across the front and 10°C on the rear
o Measure tyre temperature spreads, 3cm in from each edge of the tyres and in the centre, make sure
you are not measuring the temperature of any pickup on the tyre
o Avoid kerbs on the out-lap when the tyres are cold
o It is important to take advice from your tyre manufacturer to ensure you are following their
recommended setup parameters.
T Y R E P ER F OR M A N CE A N A L Y S I S
o
Decisions based on handling should always be preceded with thorough examination of tyre working
surface.
o
Use the temperatures, pressures, data and driver feedback with the visuals of the tyre to get the best
all round view of car and tyre behaviour.
o
Measure the tyre temperatures and pressures as often as possible straight after a fast lap, get the
driver to do a full pace in-lap, in order to get the best readings.
T Y R E CON D I T I ON F EED B A CK
When examining a tyre, always check both sides. The unloaded side can drag
the inner wheel, causing excessive negative camber and overheating in the
inner edge.
When measuring the temperature spreads start from the inner edge then work to
the outer edge.
The picture on the left is an example of a rear tyre in good condition, more
camber can be added if the rear is lacking grip.
This is an example of a well-worn front tyre, judging by the wear indicators and
the level of graining it suggests the car has been suffering with understeer. This
could also be run with more camber. If a tyre is graining on either side, this can
be used to judge whether the right level of camber is being used
Hankook Cold Starting Pressure
Slicks Wets
22 22 22 22
21 21 22 22
Hankook Hot Pressure
Slicks Wets
28 28 28 28
28 28 28 28
Outer E
dge
Outer E
dge