Shimano SM-SH51 vs SM-SH56: which SPD cleat should a beginner use?

Shimano SM-SH51 and SM-SH56 are both two-bolt SPD cleats, but they release differently. SM-SH51 is Shimano’s single-release option: the heel moves outward. SM-SH56 is multi-release and can disengage in additional directions, including with some upward-and-twisting movement. That can feel easier, but it also creates more ways to release unintentionally.

The short answer: choose SM-SH51 when you want a predictable outward heel-twist release and stronger resistance to upward disengagement. Consider SM-SH56 when easier multi-direction release suits calm commuting, touring, or confidence-building and you do not pull hard upward, jump, or ride aggressively. Neither cleat releases automatically in every fall, and both require deliberate practice.

The release difference in plain English

Shimano’s SPD user manual describes the two options this way:

Cleat	Colour	Shimano release mode	Main practical difference
SM-SH51	Black	Single release	Releases when the heel twists outward
SM-SH56	Silver or gold	Multiple release	Can release by twisting in additional directions and may release with upward force

Do not translate “multi-release” into “emergency automatic release.” Shimano explicitly warns that neither type will necessarily disengage simply because the rider loses balance. The useful difference is the foot motion available before that moment.

When SM-SH51 makes sense

SM-SH51 is a strong default when you:

• want one repeatable release action;
• ride rough surfaces where your feet may lift or bounce;
• pull upward during hard efforts;
• ride out of the saddle aggressively;
• value secure retention over extra release directions;
• already find the outward heel twist natural.

The predictable motion makes practice simple: heel out, foot free. Spring tension on a compatible adjustable pedal can often be reduced within the manual’s limits while you learn.

Single release is not the same as “expert only.” Many beginners learn SM-SH51 successfully because the release rule is clear and consistent.

When SM-SH56 makes sense

SM-SH56 can suit a rider who:

• is especially anxious about the outward heel twist;
• rides mostly calm roads, paths, commuting routes, or gentle gravel;
• wants more than one intentional release direction;
• does not jump, sprint hard, or deliberately pull upward on the pedals;
• will practise the extra release behaviours rather than assuming they are intuitive.

Shimano warns that SM-SH56 can release unexpectedly when upward force or unintended heel movement acts in a release direction. That makes it a poor choice for riding where secure upward retention is central.

“Easier to release” is useful only when it still stays engaged during the riding you do.

Check the pedal, not just the cleat shape

Two cleats can share a two-bolt pattern and still not be approved for the same pedal. Find the pedal model—usually marked on the pedal body or axle—and open its current user manual.

Confirm:

1. SM-SH51, SM-SH56, or both are listed.
2. The shoe is SPD-compatible.
3. Cleat bolts, washers, and mounting hardware are correct.
4. The pedal’s holding force is adjustable and you understand every adjustment point.
5. Reflector or local road-equipment requirements are met.

Do not use visual similarity as compatibility. The guide to cycling shoe, cleat, and pedal compatibility covers the full system check.

Set holding force separately from cleat choice

Cleat type changes release direction. Pedal spring adjustment changes the force required. Those are related but separate choices.

On Shimano pedals with adjustable holding force:

• use the exact manual to locate every adjustment screw;
• make changes in counted clicks;
• keep left and right bindings equal unless the manual says otherwise;
• do not turn past the strongest or weakest indicator;
• test for secure engagement and deliberate release after every change.

Too much holding force can make release difficult. Too little can allow an accidental disengagement. “All the way loose” is not a universal beginner setting.

Practise the cleat you actually install

Changing from SH51 to SH56 is not merely swapping a wear part; it changes the release behaviour your body has learned.

Use this sequence:

1. Support the bike securely beside a wall or have a competent helper steady it.
2. Apply both brakes and keep one foot on the ground.
3. Engage and release the other foot repeatedly using the intended motion.
4. Repeat on the other side.
5. Practise every release direction described for your cleat.
6. Move to a flat, empty practice area.
7. Ride slowly, unclip early, brake, stop, and put the same foot down.
8. Repeat with the other foot before entering traffic.

Practise while fresh, not at the end of a hard ride. The complete clipless-pedal beginner guide provides a longer first-session routine.

Release early, regardless of cleat

The safest habit is not relying on the cleat to rescue a late decision. Before a junction, tight turn, queue, steep ramp, loose section, or uncertain obstacle:

1. choose the foot you will put down;
2. release it while the bicycle is still stable;
3. keep pedalling or coasting with the other foot if appropriate;
4. brake and stop only after the foot is free.

SM-SH56 does not make last-second balance recovery guaranteed. SM-SH51 does not make calm early release difficult once the movement is learned.

Inspect wear and dirt

Both cleats are consumable. Dirt can obstruct engagement; wear can make release much tighter or looser than normal.

Before riding, check:

• bolts are present and secure;
• the cleat sits flat against the shoe;
• there is no packed mud or gravel;
• release force feels consistent left to right;
• the cleat is not cracked or heavily rounded;
• the pedal binding has no damage or unusual play.

Replace worn cleats according to Shimano’s instructions and practise again after replacement. Marking the cleat outline on the sole before removal can preserve a known position, but persistent knee, foot, ankle, or hip symptoms need a fit assessment rather than repeated guesswork.

Common mistakes

• Assuming SH56 will always release during a fall.
• Calling SH51 unsafe because it uses one release direction.
• Using SH56 for jumping or forceful upward pulling despite Shimano’s warning.
• Changing cleats and pedal tension simultaneously, then not knowing what altered the feel.
• Installing new cleats the night before a group ride.
• Choosing clipless because road cyclists are “supposed to” use it.

Flat pedals remain a valid answer. If neither cleat makes stops feel calm, return to flats and keep riding while you decide.

Your next step

Find the model number on your pedal and read its cleat table. Choose the release behaviour that fits your actual riding, install it to the manual, and complete one stationary plus one traffic-free practice session. If the motivation is mainly social pressure, read you do not need clipless pedals to be a real cyclist before spending anything.

Sources and further reading

• Shimano SPD pedal user manual: SM-SH51 and SM-SH56 release modes
• r/cycling reader context: beginner confusion about SM-SH51 versus SM-SH56 — used as an editorial demand signal; replies were not treated as product instructions.