Shimano PD-ED500 User Manual page 11

Cleat types, and using the cleats
How to release
Multiple release mode cleats: SM-SH56
(Silver, gold)
The cleats can be released by twisting in any direction.
The cleat may release in an upward direction. Therefore, pulling
up on the pedal may result in the cleat unexpectedly
disengaging.
Therefore, do not use this cleat if you pull up on the pedals
when riding, or if you perform jumps or similar in which forces
act on the foot in the direction of cleat release.
Although the cleats do release in directions other than the
horizontal, they will not necessarily release if you lose your
balance.
Accordingly, for places and conditions where it looks as though
you may lose balance, make sure that you have sufficient time
to release the cleats beforehand.
If the characteristics of multiple release mode cleats are not
sufficiently understood or used correctly, they are more likely
than single release mode cleats to release unexpectedly.
Once you have adjusted the cleats, practice engaging and
releasing until you are fully familiar with the amount of force
required in each direction. An unexpected release may cause
you to fall off the bicycle and serious injury may result.
It is necessary to practice releasing until you become accustomed to the technique.
* In multiple release mode, releasing by lifting your heel requires particular practice.
Single release mode cleats: SM-SH51
(Black / sold separately)
These cleats only release when the heel is moved outward.
They will not release if the heel is twisted in any other direction.
Upward force may be applied to the pedal, since the cleat will
not release unless the foot is twisted.
The cleats will not necessarily release if you lose your balance.
Accordingly, for places and conditions where it looks as though
you may lose balance, make sure that you have sufficient time
to release the cleats beforehand.
When, for example, you are pedaling vigorously, your heel may
inadvertently twist sideways and this may cause the cleat to
release accidentally.
Once you have adjusted the cleats, practice engaging and
releasing until you are fully familiar with the amount of force
and foot angle required. An unexpected release may cause you
to fall off the bicycle and serious injury may result.
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