SPD vs SPD-SL vs Look Keo: Clipless Pedal Systems Compared

Clipless pedal systems compared at a glance

Every clipless system pairs a pedal with its own cleat, and the cleat’s bolt pattern decides which shoes it fits.

System	Shoe bolt pattern	Cleats and float	Entry	Walking	Shoe type	Typical use
Shimano SPD	2-bolt	SM-SH51 or SM-SH56, both 4°	Double-sided on most models	Easy: cleat is recessed	MTB, gravel, touring, indoor shoes	Commuting, touring, gravel, MTB, spin bikes
Shimano SPD-SL	3-bolt	Red SM-SH10 0°, blue SM-SH12 2°, yellow SM-SH11 6°	Single-sided	Awkward: large plastic cleat	Stiff road shoes	Road riding and racing
Shimano SPD-SLR	3-bolt	CL-SL110 (its own cleat family)	Single-sided	Awkward	Stiff road shoes	Road riding and racing
Look Keo	3-bolt	Black 0°, gray 4.5°, red 9°	Single-sided	Awkward; Keo Grip pads help	Stiff road shoes	Road riding and racing
Wahoo Speedplay	4-hole (3-hole adapter included)	One cleat, float set from 0° to 15°	Double-sided	Poor without covers	Road shoes	Road, fit-sensitive riders
Crankbrothers	2-bolt	Standard 6°; Easy Release 0° or 6°	Four-sided	Easy	MTB and gravel shoes	MTB, gravel, cyclocross

Read the table as two families: 2-bolt systems (SPD, Crankbrothers) built around a shoe you can walk in, and 3-bolt or 4-hole systems (SPD-SL, SPD-SLR, Keo, Speedplay) built around a big, stiff road platform. Pedals for every system are in our clipless pedals guide.

SPD vs SPD-SL: same brand, different jobs

SPD and SPD-SL are both Shimano, but the pedals, cleats and usually the shoes are all different.

• Cleat and shoe. SPD’s small metal cleat bolts into a 2-bolt channel and sits inside the tread, so the shoe walks like a stiff sneaker. SPD-SL’s wide plastic cleat bolts to a 3-bolt road sole and stands proud of it.
• Platform. SPD-SL spreads your pedaling load over a wider pedal and cleat. SPD concentrates it on a smaller area, so stiffer soles help on long days.
• Entry. Most SPD pedals are double-sided: step down and you are in. SPD-SL pedals are single-sided and hang tail-down, so you hook the front lip with the cleat’s nose, then press down.
• Release. Both release with an outward heel twist, with tension set on the pedal. Only SPD offers a multi-release cleat (SM-SH56).
• Float. SPD cleats give 4°. SPD-SL lets you choose 0°, 2° or 6° by cleat color.
• Dirt. SPD copes with mud; SPD-SL cleats clog and wear quickly if you walk on them outdoors.

Choose SPD if you walk at all on your rides, ride off-road, or want one pair of shoes for the gym bike, the gravel bike and the commute. Choose SPD-SL if you ride mostly on the road and barely walk in your cycling shoes. Plenty of experienced tourers and long-distance riders run SPD on drop-bar bikes for the walking alone; it is not a beginner’s compromise.

SPD vs Look Keo

SPD vs Look Keo is the same trade-off as SPD vs SPD-SL, because Keo is a road system: a wide 3-bolt plastic cleat on a stiff road shoe. Keo Grip cleats add rubber pads for café floors, but you still walk on your heels. The real question is the shoe you want to wear.

SPD-SL vs Look Keo: the real road decision

SPD-SL and Look Keo are close rivals: same 3-bolt road shoe, wide single-sided pedal, heel-twist release. Most riders would be happy on either, so decide on the details.

	Shimano SPD-SL	Look Keo
Float choices	0°, 2°, 6°	0°, 4.5°, 9°
Most float available	6° (yellow)	9° (red)
Tension	Screw on every pedal	Screw on Keo Classic models; carbon blade spring on Keo Blade models
Walking help	Shimano cleat covers	Rubber pads on Keo Grip cleats; Look cleat covers
One cleat across the range	105 PD-R7000, Ultegra PD-R8000, Dura-Ace PD-R9100	Keo Classic 3 up to Keo Blade Ceramic

How to decide:

• Your knees like to move: Look’s red 9° cleat gives more freedom than any SPD-SL cleat. See cleat float explained.
• You want a planted feel with a little give: Shimano’s blue 2° cleat has no Keo equivalent.
• You already own one system: stay with it. Cleats and cleat position carry across the whole range, so upgrading costs a pedal, not a new setup.
• You walk mid-ride: Keo Grip pads help, or carry cleat covers for either system.

More on each range on the Shimano and Look brand pages.

Where SPD-SLR fits

SPD-SLR is Shimano’s newest road system, used by the Ultegra PD-R8200 and Dura-Ace PD-R9300 and supplied with CL-SL110 cleats. Per Shimano, it gives a lower stack and easier engagement than SPD-SL.

The cleats still bolt to any 3-bolt road shoe, but major retailers state that SPD-SLR cleats are not compatible with SPD-SL pedals. Treat it as its own system: SPD-SLR pedals with SPD-SLR cleats, SPD-SL pedals with SPD-SL cleats.

Speedplay and Crankbrothers: the rest of the field

Wahoo Speedplay (4-hole)

Speedplay turns the usual design inside out: the pedal is a small double-sided “lollipop” and the spring lives in the cleat. You get double-sided road entry and float you can set from 0° to 15° with screws on the cleat. A 3-hole adapter fits the 4-hole cleat to ordinary road shoes.

Spring force is chosen by cleat: Standard Tension (black) or Easy Tension (gray), which the Speedplay Comp ships with. The catch is walking: the cleat is large and dislikes grit, so most riders use covers. See Speedplay.

Crankbrothers (2-bolt)

Crankbrothers bolts to the same 2-bolt shoes as SPD but uses its own brass cleat. The Eggbeater and Candy mechanisms accept it from four sides and have little for mud to pack into, which suits cyclocross and wet gravel.

There is no tension screw. The Standard cleat gives 6° float and a 15° or 20° release, depending on which foot you fit it to. The Easy Release cleat releases at 10° and comes in 0° or 6° float; current Eggbeater 1, Candy 1 and Double Shot 1 pedals ship with it. See the Eggbeater 1 and Crankbrothers.

Others you will meet

• Look Delta: Look’s older 3-bolt system, now mostly seen on Peloton bikes; its cleat differs from Keo. See Peloton and spin bike pedals.
• Time ATAC, HT and other 2-bolt systems: they fit SPD-style shoes but most use their own cleats. “SPD compatible” often means “fits SPD shoes”, not “takes Shimano cleats”.

Which clipless system should you choose?

Choose by where you ride and how much you walk, then by fit needs.

Rider	Best system	Why
New to clipless, commuting, touring	SPD with SM-SH56 cleats	Double-sided, walkable, easiest release
Gravel and cyclocross	SPD or Crankbrothers	Quick re-entry and mud clearance
Cross-country and trail MTB	SPD or Crankbrothers	Easy re-entry on rough ground
Road fitness and long road rides	SPD-SL or Look Keo	Wide platform, stiff road shoe
Road racing	SPD-SL, SPD-SLR or Look Keo	Low, stiff, wide platform
Sensitive knees	Speedplay, or Keo red 9° cleats	Most adjustable or most float
Indoor cycling	SPD on many spin bikes; Look Delta on Peloton	Match the bike or swap its pedals
One pair of shoes for everything	SPD	Works on road, gravel, MTB and many spin bikes

If you ride both road and dirt, SPD on every bike is the simplest setup; see double-sided clipless pedals. Want to ride in sneakers too? Look at hybrid pedals. Not sure about clipping in at all? Read flat vs clipless pedals.

Cross-compatibility: what fits and what does not

A cleat only clips into its own pedal family, even when two cleats bolt to exactly the same shoe. These are the combinations people most often get wrong.

Combination	Works?	Why
SPD-SL cleat in a Look Keo pedal, or the reverse	No	Same 3-bolt shoe, different cleat shape
Look Keo cleat in a Look Delta pedal, or the reverse	No	Delta is an older, different cleat
SPD-SLR cleat in an SPD-SL pedal	No	Retailers list them as not compatible
Shimano SPD cleat in a Crankbrothers pedal	No	Same 2-bolt shoe, different cleat
Road cleat on a 2-bolt MTB shoe	Usually no	Needs 3-bolt holes; few shoes have both
Speedplay cleat on a 3-bolt road shoe	Yes	The 3-hole adapter is included
SPD pedals on a road bike	Yes	Every system uses the same 9/16” pedal thread on adult bikes

The rule that clears up most confusion: match the cleat to the pedal, then the bolt pattern to the shoe. “3-bolt” describes the shoe, not the cleat. Our cleats guide lists every pairing.

Switching clipless systems

Switching means new pedals and cleats, plus new shoes if the bolt pattern changes. SPD to a road system usually means new 3-bolt shoes; SPD-SL to Keo keeps the same shoes.

1. Check your soles. A 2-bolt channel, three holes in a triangle, or both tells you where you can go without new shoes.
2. Buy pedals with cleats, plus spares in the float you want.
3. Record your current position first. Trace the old cleat’s outline, photograph the sole, and measure from the shoe’s tip to the cleat’s center.
4. Transfer the axle position, not the outline. Cleats differ in shape, so line up where the spindle sits under the ball of your foot, then match the angle. Full method: how to install clipless pedals and cleats.
5. Match float. From yellow SPD-SL (6°), the nearest Keo cleats are gray (4.5°) or red (9°); from red Keo, yellow is the most SPD-SL offers.
6. Relearn entry before traffic. Every system clips in a little differently; see how to clip in and out.

If you own several bikes, run one system across all of them so one pair of shoes works everywhere.