GT Grade, Руководство пользователя

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PART 2
About Shimmy
Section A. Important Safety Information
GT Bicycle Owner’s Manual
About Shimmy
Some cyclists have experienced disturbing
“shimmy” or “vibration” at certain speeds. This
symptom is rarely reported and there is no
agreement among experts as to the cause.
Among the proposed causes of shimmy are: a
loose headset, frame alignment problems,
weight of front wheel magnets for cycle
computers, and spoke tension.
Larger riders on larger frames are thought by
some to be more likely to experience such
vibration.
If you experience such a vibration, gently apply
the brakes and slow down. Another suggestion is
to press your leg against the top tube as you
slow down.
WARNING
If you experience “shimmy,” do not ride
continue to ride your bike. Take the bicycle
to your retailer for inspection, service, or
changes.
WARNING
Do not ride on the aero handlebar extensions in
traffic or on difficult roads.
Ride on the aero handlebar extensions only
when the road is clear of traffic and hazards
and you have a long line of sight.
When using the extensions understand that you
are compromising steering and braking in favor
of speed. If you need to take evasive steering
or braking action while on the extensions you
could have an accident, with risk of serious
injury, paralysis or death.
Aerodynamic handlebars and extensions are a
design trade-off which positions you further
forward than on a conventional road bike, so:
■ Overly hard use of the front brakes will
pitch you forward, off the bike, more easily.
■ Rear braking performance will not equal
that of a conventional road bike.
When braking hard on any bike, including time
trial or triathlon, you must shift weight back to
allow front brake use without pitching yourself
forward, off the bike. Shifting weight back
allows more rear braking effect before the rear
wheel begins to skid when braking hard, or
braking on a steep downhill. See PART1
Section 4C. of this manual.
Aerodynamic handlebars and extensions are
intended for racing and competition in time trial
and triathlon and are poorly suited for riding in
cities or congested urban areas where conflicts
with cars will frequently require panic braking.