Fit And Safety - Giant TwisT LaFree Twist 2002 Motorized Bicycle Owner's Manual

3.1 Fit
Make sure the bike fits. A bike that's too big
or too small for the rider is harder to control
and can be uncomfortable or dangerous.
Frame size.
Your dealer will have recommended the best
frame size for you, based on the information
provided. If you picked your own bike at the
dealer shop, your dealer would have taken
the time to fit you to the correct frame size at
the time. If someone else selected the bike
for you, as a gift, for example, it's important
for you to make sure that it fits before you
ride it.
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FIT AND SAFETY

Standover height (see fig.9).
It is the distance from the ground to the top
of the top tube at the point where your crotch
would be if you were straddling the bike by
standing half way between the saddle and
the handlebar stem. To check, straddle the
bike. If your crotch touches the frame, the
bike is too big for you. A bike you ride only
on-road should offer a minimum clearance
between top tube and your crotch of 2.5 to
5 cm. (one to two inches).
A bike that you'll ride off-road tracks should
have 7.5 cm. (three inches) minimum
clearance, whilst a mountain bike for use on
tough terrain should offer 10 or more cm.
(four or more inches) clearance.
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FIG. 9