Tyre Checks; The Correct Pressures; Tyre Care; Tyre Tread Depth - Yamaha TDM850 User Manual

4 Tyre checks

The correct pressures:

• The tyres, must be checked when cold, not
immediately after riding. Note that low tyre
pressures may cause the tyre to slip on the rim or
come off. High tyre pressures will cause
abnormal tread wear and unsafe handling.
• Use an accurate pressure gauge.
• Proper air pressure will increase tyre life and
provide maximum stability and ride comfort.

Tyre care:

• Check the tyres carefully for cuts, tears,
embedded nails or other sharp objects and
excessive wear. Operation of the motorcycle with
excessively worn tyres is extremely hazardous,
as traction and handling are directly affected.
• Check the condition of the tyre valve and
ensure the dust cap is in place.
• Pick out any stones or nails which may have
become embedded in the tyre tread. If left, they
will eventually penetrate through the casing and
cause a puncture.
• If tyre damage is apparent, or unexplained
loss of pressure is experienced, seek the advice
of a tyre fitting specialist without delay.
1
Check the tyre pressures when the tyres are
cold and keep them properly inflated.
Daily (pre-ride) checks 0.15
Loading/speed
1991 to 1995 TDM models
Rider only
Rider and passenger, or high speed
1996-on TDM models
All loads/speeds
TRX models
Rider only
Rider and passenger, or high speed
XTZ models
Rider only
Rider and passenger, or high speed

Tyre tread depth:

• At the time of writing UK law requires that tread
depth must be at least 1 mm over 3/4 of the tread
breadth all the way around the tyre, with no bald
patches. Many riders, however, consider a minimum
of 2 mm tread depth to be a safer limit. Yamaha
recommend a minimum of 1.5 mm on the front
and 2 mm on the rear.
Measure tread depth at the centre of the
tyre using a tread depth gauge.
Front Rear
28 psi (2.0 Bar) 28
33 psi (2.25 Bar) 36
psi (2.0 Bar)
psi (2.50 Bar)
40 psi (2.75 Bar)
33 psi (2.25 Bar)
33 psi (2.25 Bar) 36 36 psi (2.50 Bar) 41
psi (2.50 Bar) psi (2.80 Bar)
33 psi (2.25 Bar) 33 33 psi (2.25 Bar) 36
psi (2.25 Bar) psi (2.50 Bar)
• Many tyres now incorporate wear indicators in
the tread. Identify the triangular pointer on the
tyre sidewall to locate the indicator bar and
replace the tyre if the tread has worn down to the
bar.
S
3 Tyre tread wear indicator bar location marking
(usually either an arrow, a triangle or the letters
TWI) on the sidewall (arrowed).
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