Triumph Sprint ST Owner's Handbook Manual page 64

Accessories and Loading
Warning
If the passenger seat or rack (rack on
Sprint GT models) are used to carry small
objects, they must not exceed a total
maximum of 5 kg in weight (combined on
the seat and rack on Sprint GT models),
must not impair control of the motorcycle,
must be securely attached and must not
extend beyond the rear or sides of the
motorcycle.
Carriage of objects in excess of 5 kg in
weight, that are insecure, impair control or
extend beyond the rear or sides of the
motorcycle may lead to loss of motorcycle
control and an accident.
Even if small objects are correctly loaded
onto the rear seat or rack (on Sprint GT
models), the maximum speed of the
motorcycle must be reduced to 80 mph
(130 km/h).
64
Caution
Sprint ST only: Do not allow luggage to
rest on or against the upper portion of the
rear bodywork.
Allowing luggage to rest on or against the
upper portion of the rear bodywork could
close the air gap between the bodywork
and the exhaust potentially causing the
bodywork to become damaged
overheating.
by