Biomechanics guide
Cleat setup: the complete guide
It is the most neglected parameter in bike fitting. Yet a few degrees of rotation or a few millimetres of fore-aft error are enough to trigger chronic knee pain. Here: the three parameters, asymmetry correction, the float of each cleat colour and a step-by-step fitting guide for Look Keo, SPD-SL, SPD and Speedplay.
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In short
Starting point: the pedal axle under the head of the first metatarsal, neutral rotation along the foot's natural angle, Q-Factor matched to pelvis width. Adjust in this order: fore-aft, rotation, then stance width. A left/right asymmetry is corrected with wedges or shims, not by forcing perfect symmetry.
Fundamentals
The 3 parameters of cleat setup
Every cleat is adjusted along three axes. An error on just one is enough to cause knee, hip or foot pain, even if the rest of your fit is correct.
Rotation
The foot's opening angle relative to the bike's axis. Your natural angle, known as the Fick angle, is between 0° and +5° outward in the vast majority of cases. Forcing a foot to 0° when its natural angle is +5° means a knee twist on every pedal stroke: roughly 5,000 micro-twists per hour, the number of pedal revolutions a cyclist makes in an hour (Holmes et al., 1994).
Fore-aft position
The front-to-back placement of the cleat under the shoe. The pedal axle should sit under the head of the first metatarsal, the big toe joint. Too far forward, you overload the forefoot and calves; even a small fore-aft shift changes the knee and ankle angles (Chartogne et al., 2023). Too far back, you lose power and you lose the ankle's leverage.
Q-Factor, or stance width
The distance between your two feet on the pedals. It should match the width of your pelvis. Too wide, the knee drifts into valgus, inward, which loads its inner side. Too narrow, it drifts into varus, which loads its outer side. It is adjusted by shifting the cleat on the sole, or with spacers on the pedal axle.
Parameter 01
Rotation: finding your foot's natural angle
This is the most critical parameter. A wrong rotation angle is the first thing to check when the pain is on the side of the knee: cleats set too far toe-in (toes pointing inward) for iliotibial band syndrome, on the outside; cleats set too far toe-out for inner knee pain, on the medial collateral ligament.
How to determine your angle
Sit on a high table, legs hanging, feet relaxed. Look at the angle your feet naturally form relative to vertical: that is your Fick angle. Most cyclists sit between 0° and +5° outward, rarely below 0°.
Transfer that angle to the cleat. The idea is simple: the pedal must not force your foot into a position that is not its own. The system's angular freedom, the float, absorbs part of the imprecision, but does not replace a good initial setting.
- The bike's axis.
- The foot's axis: its natural angle, between 0 and +5° outward (Fick angle).
- The pedal axle, at right angles to the bike: the cleat follows the foot's angle, the pedal must not force it.
The most common mistake: setting cleats straight by default. If your natural foot angle is +5° and the cleat imposes 0°, your knee compensates on every revolution. At 90 rpm for two hours, that is 10,800 torsional stresses on the knee. That is how outer knee pain, on the iliotibial band, appears after 40 or 60 km (25 to 37 miles).
Parameter 02
Fore-aft: positioning the pedal axle
The fore-aft position determines where force transfers from your foot to the pedal. The anatomical landmark is the first metatarsophalangeal joint, the bump of the big toe.
Protocol
- Put your shoe on without clipping in, then palpate the head of the first metatarsal through the shoe.
- Mark that point on the side of the sole with a marker.
- Position the cleat so the pedal axle passes exactly under that mark, or 1 to 2 mm behind it.
- For long distance, a slight setback of 1 to 3 mm behind the metatarsal is often preferable: it unloads the calf and the Achilles.
If you get an Achilles tendinopathy from cycling, check the fore-aft first. A cleat too far forward increases the calf's lever arm and overloads the tendon on every pedal stroke.
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See also: saddle height, calculator and complete guide
All bike fitting guides
- Head of the 1st metatarsal, the big toe joint.
- Head of the 5th metatarsal.
- Pedal axle: the cleat sits on the line of the metatarsal heads.
- Head of the 1st metatarsal.
- Pedal axle: right under this landmark, or 1 to 2 mm behind it, towards the heel.
Advanced correction
Left/right asymmetry: wedges and shims
Few cyclists are perfectly symmetrical, and setting both cleats identically often creates an asymmetry instead of correcting it. The asymmetry can be anatomical (leg length or foot morphology) or functional, from postural compensations and old injuries.
Wedges, the angular shims
They slide between the cleat and the sole to correct a varus (foot tilted outward) or a valgus, tilted inward. An uncorrected varus forces the knee into internal rotation on every push: a classic driver of patellofemoral syndrome in cyclists. The tilt of the foot on the pedal does change the loads on the knee (Gregersen et al., 2006). Available in 1°, 1.5° and 2°.
Shims, the thickness spacers
They compensate for a leg length discrepancy and are added under the cleat on the short side. Beyond 5 mm of difference, a shim is justified, or cranks of different lengths: a shorter crank on the short-leg side, or a longer one on the long-leg side, depending on the cranks you have. Below that, the body generally compensates on its own. An osteopathic assessment distinguishes a true discrepancy from a compensatory one, and that changes the whole approach.
When to consult: if your knee pain persists despite a careful setup, get an osteopathic assessment. Limited thoracic rotation, an asymmetric pelvis or a stiff ankle can throw off the whole setting. Fitting alone does not correct a postural dysfunction.
Systems
What changes with your cleat system
The biomechanical principle never changes: rotation, fore-aft, Q-Factor. What differs is the adjustment mechanics.
| System | Cleat | Float | Who it suits |
|---|---|---|---|
| Look Keo | Black | 0°, fixed | Rarely: a setting already validated, with no pain at all |
| Look Keo | Grey | 4.5° | Most cyclists |
| Look Keo | Red | 9° | Sensitive knees, or a natural foot angle you are not yet sure of |
| Shimano SPD-SL | Red (SM-SH10) | 0°, fixed | Rarely: a setting already validated, with no pain at all |
| Shimano SPD-SL | Blue (SM-SH12) | 2° | Little movement, foot already well aligned |
| Shimano SPD-SL | Yellow (SM-SH11) | 6° | First choice, the most common |
| Shimano SPD | Black (SM-SH51) | 4° | Release by twisting the heel outward: MTB, gravel |
| Shimano SPD | Silver (SM-SH56) | 4° | Also releases when you pull the foot up: beginners, city bikes |
| Wahoo Speedplay | One cleat, two stop screws | Adjustable from 0° to 15° | The most adjustable system, and also the most delicate to set up |
Total float as stated by the manufacturers. It lets your heel pivot a little around your starting position: it absorbs imprecision, it does not replace the rotation setting.
Look Keo
3 bolts. Rotation is set by pivoting the cleat on the sole before tightening. Depending on the pedal model, release tension is set with a screw or determined by the pedal's blade. Wear indicators moulded under the cleat show when to replace it.
Shimano SPD-SL
3 bolts, road. Wider platform than Look, so more stable. Yellow as the first choice. Tension is set with a screw at the back of the pedal. Same adjustment as Look across all three parameters.
Wahoo Speedplay
4 bolts, dual-sided pedal. Two stop screws on the cleat set the inner and outer limits of the pivot. Set the starting rotation first, then open up the float around it, never the other way round.
Shimano SPD
2 bolts, MTB and gravel. The cleat is recessed into the sole, so less latitude on fore-aft. Q-Factor is often wider than on road: watch the knee-foot alignment. Tension is set with a screw on each side of the pedal.
Step by step
How to fit and set up your cleats, step by step
The same method works for Look Keo, SPD-SL, SPD and Speedplay: mark, fit without tightening, adjust, then tighten and test.
Mark your landmarks
With your shoe on, find the head of the first metatarsal and mark it on the side of the sole. If you are replacing worn cleats, first trace around them with a marker, or outline them with tape: you will fit the new ones in exactly the same place.
Fit the cleat loosely
Lightly grease the bolt threads, position the cleat so the pedal axle falls under your mark, or 1 to 2 mm behind it, then tighten just enough that it no longer moves on its own.
Set rotation and width
Pivot the cleat so it follows your foot's natural angle, most often between 0 and +5° outward. Then shift it towards the inside or outside of the sole to line your knee up over your foot.
Tighten evenly
Tighten the bolts gradually and evenly, alternating between them, to the torque given by the cleat or shoe manufacturer. A cleat that turns while you ride undoes the whole setting; an overtightened bolt damages the threaded insert in the sole.
Set the pedal tension
Start at the softest setting, then increase it one notch at a time until your foot no longer unclips when you pull hard. Set both pedals the same.
Do a first test
Clip in and out several times while stationary, then ride for about 15 minutes on an indoor trainer before a short ride. If any discomfort appears, change one parameter at a time, by 1 to 2° or 1 to 2 mm, and note what you change.
When to replace your cleats: as soon as the wear indicators show on Look Keo cleats, when releasing becomes harder or easier than before, when the cleat develops play on the pedal, or if you feel you are no longer properly clipped in. A worn cleat lets the foot pivot more than intended and throws off the rotation. Cleats wear mostly when you walk: cleat covers limit the wear.
Frequently asked questions
Questions about cleat setup
Which Look Keo cleat colour should I choose?
Grey, with 4.5° of float, suits most cyclists. Red, 9°, gives more leeway if your knees are sensitive or if you have not yet found your foot's natural angle. Black, fixed, is best kept for a setting that has already been validated.
How often should you replace your cleats?
There is no fixed mileage: wear depends mostly on how much you walk in them. Replace them when the wear indicators show, when releasing feels different or when the cleat develops play. Trace around them before removing them so you can fit the new ones in the same place.
Should both cleats be set the same way?
No. Each foot has its own natural angle, and many cyclists have a slight asymmetry. Set each cleat to its own foot, then check the knee alignment on each side.
How long does it take to get used to a new setting?
Usually a few rides. Change one parameter at a time and keep it for two or three rides before judging. Real pain, however, is not part of getting used to it: go back to the previous setting.
Are Look Keo and SPD-SL cleats compatible?
No: each cleat only works with the pedals of its own system. Both do, however, fit the same 3-bolt road shoes. SPD cleats, with 2 bolts, need 2-bolt shoes: MTB, gravel or city.
References
Studies and sources cited
The studies this guide relies on, with their DOI link. Anything not referenced comes from the author's clinical experience.
- Chartogne M, Millour G, Duc S, et al. Acute effects of small changes in antero-posterior shoe-cleat position on physiological and biomechanical variables in road cycling. Sports Biomech. 2023;22(4).
- Gregersen CS, Hull ML, Hakansson NA. How changing the inversion/eversion foot angle affects the nondriving intersegmental knee moments and the relative activation of the vastii muscles in cycling. J Biomech Eng. 2006;128(3).
- Holmes JC, Pruitt AL, Whalen NJ. Lower extremity overuse in bicycling. Clin Sports Med. 1994;13(1).
- Bini RR, Flores Bini A. Potential factors associated with knee pain in cyclists: a systematic review. Open Access J Sports Med. 2018;9.
- Van Sickle JR, Hull ML. Is economy of competitive cyclists affected by the anterior-posterior foot position on the pedal? J Biomech. 2007;40(6).
- Paton CD. Effects of shoe cleat position on physiology and performance of competitive cyclists. Int J Sports Physiol Perform. 2009;4(4).
- Bonfatti M, et al. The effect of cleat position on foot pain in cyclists. J Sports Med Phys Fitness. 2024;64(8).
- Millour G, et al. Physiological, biomechanical, and subjective effects of medio-lateral distance between the feet during pedalling for cyclists of different morphologies. J Sports Sci. 2021;39(7).
- Yeo BK, Bonanno DR. The effect of foot orthoses and in-shoe wedges during cycling: a systematic review. J Foot Ankle Res. 2014;7.
Links checked on 6 November 2026.
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