The Question Nobody Actually Answers
You have been told to pedal at 90 rpm. Maybe 85. Maybe 95. The number depends on which coach, which article, which YouTube video got to you first.
Here's the thing nobody tells you: the "right" cadence is not a fixed number. It is the output of a calculation your body is already running — a real-time negotiation between your muscles and your cardiovascular system, shaped by your fitness, your fatigue, the gradient under your wheels, and years of accumulated pedalling habits.
The research on this is fascinating, and it tells a very different story from the one most cyclists carry around in their heads. It is not a story about finding one magic number and sticking to it. It is a story about understanding a trade-off, and then using that understanding to recognise when your current cadence is actually costing you performance.
Let me break this down.
The Trade-Off That Governs Every Pedal Stroke
Every time you push a pedal, your body faces a choice. It can produce the required power with fewer, harder pedal strokes — low cadence, big gear — or with more, lighter pedal strokes — high cadence, small gear. The total work done is identical. The way it costs you is not.
Low cadence demands more force per pedal stroke. That force comes primarily from your skeletal muscles — your quads, glutes, hamstrings. The higher the force per stroke, the more blood flow is restricted within contracting muscles, the more motor units are recruited, and the faster those muscles accumulate fatigue. This is the muscular cost.
High cadence reduces the force per stroke, but your legs are now moving faster. Moving limbs faster requires more oxygen. Your heart rate rises, your breathing rate increases, and the metabolic overhead of simply spinning your legs climbs measurably — even at identical power outputs. This is the cardiovascular cost.
Your optimal cadence sits at the point where the combined cost — muscular plus cardiovascular — is minimised. Shift too far toward low rpm and the muscular penalty dominates. Shift too far toward high rpm and the cardiovascular penalty takes over. The sweet spot is specific to you, and it moves as your fitness changes.
This is not theory. It has been measured, repeatedly, in laboratories across Europe, and the findings are consistent enough to build a practical framework on.
What Lucia Found in the Lab
Alejandro Lucia's research group at the Universidad Europea de Madrid published some of the most cited work on cycling cadence in the early 2000s. The studies were elegant in their design: take professional cyclists, have them ride at a fixed power output across a range of cadences — typically 60, 80, 90, 100, and sometimes 110 rpm — and measure everything. Oxygen consumption, heart rate, blood lactate, perceived exertion, muscle oxygenation.
The first finding was not surprising: there is a metabolically optimal cadence. At any given power output, one particular cadence produces the lowest oxygen cost. For the professional cyclists Lucia studied, this sat around 80 rpm at moderate intensities. At that cadence, the total metabolic expense of producing 200 or 250 watts was at its absolute minimum.
The second finding was the interesting one. When those same cyclists were allowed to choose their own cadence — no instruction, just ride — they consistently selected cadences 5 to 10 rpm higher than the most economical rate. They chose 88-95 rpm instead of 80-85.
Why would a professional athlete deliberately choose a less efficient option?
Because efficiency in a laboratory does not mean the same thing as performance on the road. What those riders were doing, intuitively, was trading a small increase in oxygen cost for a meaningful reduction in muscular fatigue. They were willing to breathe a little harder — a cost their enormous cardiovascular systems could absorb without blinking — in exchange for legs that would last deeper into the race.
This is the central insight, and it changes how you should think about your own cadence entirely.
Efficiency Versus Durability: Why They Pull in Opposite Directions
Here is where it gets really interesting.
If you are riding for five minutes, the most efficient cadence wins. You want to spend as few calories and as little oxygen as possible to produce the required power. In a short effort, muscular fatigue barely registers. The metabolically optimal cadence — typically lower than what most trained cyclists self-select — really is the best choice.
But nobody races for five minutes. The moment you extend the effort to one hour, two hours, five hours, the equation shifts. Now muscular fatigue is a real and growing factor. Each pedal stroke at 70 rpm applies substantially more force through the knee and hip than the same power at 90 rpm. That force costs you in ways that do not show up immediately on a metabolic cart but show up brutally at kilometre 140.
The Lucia research made this visible by measuring blood lactate alongside oxygen consumption. At lower cadences, even when total oxygen consumption was lower, blood lactate values were higher. The muscles were working harder per stroke, crossing deeper into glycolytic territory, and accumulating metabolic byproducts faster. The body's overall metabolic bill was lower, but the local muscular bill was higher.
For a professional cyclist with a VO2max north of 75 ml/kg/min, the cardiovascular cost of spinning at 92 rpm instead of 80 rpm is negligible — a rounding error against the background of their aerobic capacity. The muscular savings, however, are substantial. They arrive at the final hour of a race with legs that still have something in them.
For you, the maths might be different. And that is not a polite way of saying worse — it is a statement about where the trade-off sits given your specific physiology.
Hansen and the Fibre Recruitment Problem
Ernst Albin Hansen's work at the University of Southern Denmark added a critical layer to this picture. Where Lucia measured metabolic cost from the outside — oxygen in, carbon dioxide out — Hansen looked at what was happening inside the muscle.
His research demonstrated that cadence directly affects which muscle fibres are recruited at a given power output. At low cadences — 60 rpm, for instance — each pedal stroke requires enough force that the body recruits Type II muscle fibres alongside the Type I fibres that do most of the work at moderate intensities.
Type II fibres are stronger but less efficient. They fatigue faster. They rely more heavily on glycogen as a fuel source. They produce more lactate per unit of work.
At higher cadences — 90 rpm at the same power — the force per pedal stroke drops below the threshold where significant Type II recruitment kicks in. The work stays predominantly in the Type I fibres, which are built for endurance. They are more fatigue-resistant, more efficient at burning fat alongside glycogen, and they recover faster between contractions.
The practical implication is direct: grinding at low rpm does not just feel harder. It is metabolically harder at the muscular level, even when whole-body oxygen consumption suggests otherwise. You are depleting glycogen faster, accumulating peripheral fatigue faster, and reducing your ability to produce power later in the ride.
This does not mean low cadence is always wrong. It means low cadence has a cost, and that cost compounds with duration. The longer your event, the more the fibre-recruitment penalty matters.
The Glycogen Problem Nobody Talks About
The fibre-recruitment finding connects to something that matters enormously for endurance performance: glycogen depletion rate.
Your body stores a finite amount of muscle glycogen — roughly 400-500 grams in trained individuals, enough for 90 to 120 minutes of hard riding. Type I fibres are comparatively thrifty with glycogen. They happily burn fat alongside it, extending the supply. Type II fibres are not thrifty. They consume glycogen at a significantly higher rate per unit of work, and they have limited capacity to substitute fat as a fuel source.
When you grind at 65 rpm for three hours, you are not just producing the same power less comfortably. You are spending your glycogen budget faster because you have brought more Type II fibres into the task. Two riders at identical power and identical duration, one at 65 rpm and one at 90 rpm, will arrive at the end of the ride with meaningfully different glycogen levels. The grinder is closer to empty.
This is why some riders bonk earlier than their nutrition strategy should allow. They account for the caloric cost of the ride but not the fibre-recruitment cost of their cadence. The total energy expenditure might be similar, but the rate of glycogen depletion is not.
For rides under ninety minutes, this barely registers. For a century ride, a gran fondo, or a multi-day event, it is the difference between finishing with something left and finishing hollow.
VO2max: The Variable That Predicts Everything
If there is a single number that predicts your preferred cadence more reliably than any other, it is your VO2max.
This makes physiological sense when you understand the trade-off. Higher cadence shifts cost from the muscles to the cardiovascular system. If your cardiovascular system is enormous — high VO2max, strong cardiac output, efficient oxygen delivery — absorbing that shifted cost is easy. Your heart barely notices the difference between 80 and 95 rpm. Your muscles notice it immediately.
If your cardiovascular system is more modest, spinning faster comes with a proportionally larger penalty. Your heart rate climbs measurably. Your breathing becomes laboured. The cardiovascular cost of high cadence eats into the headroom you need for sustaining power.
The research supports this cleanly. Studies comparing riders across fitness levels consistently find that higher-fit riders self-select higher cadences. Professional cyclists with VO2max values above 75 ml/kg/min typically self-select 90-100 rpm on flat terrain. Well-trained amateurs with VO2max values around 55-65 ml/kg/min tend to settle at 82-90 rpm. Recreational riders below 50 ml/kg/min often prefer 75-85 rpm.
These are not arbitrary preferences. They are each rider's body solving the same equation with different variables. A VO2max of 80 ml/kg/min means the cardiovascular system has vast reserves. Spinning at 95 rpm might cost an extra 2-3 ml/kg/min of oxygen — barely noticeable. For a rider at 48 ml/kg/min, that same 2-3 ml/kg/min increase represents a much larger fraction of their total capacity. The cardiovascular headroom is not there.
The good news: VO2max is trainable. And as your aerobic fitness improves, the cadence equation shifts in favour of higher rpm. This is not something to force — it is something that tends to happen naturally if you are open to it.
Why Your Training History Matters More Than You Think
Your nervous system learns cadence. Not in the abstract, motivational-poster sense of "muscle memory," but in the literal neurological sense of motor pattern efficiency.
When you pedal at a given cadence for thousands of hours, your neuromuscular system becomes increasingly efficient at that specific pattern. The timing of muscle activation, the sequencing of agonist and antagonist contractions, the elimination of wasted co-contraction — all of this is refined through repetition. It is why a cadence that feels awkward in week one can feel natural by week twelve.
This has two important consequences.
First, your self-selected cadence is partly an artefact of your training history, not purely a reflection of your current physiology. If you spent your first five years of serious riding grinding at 75 rpm because a mate told you it would build strength, your neuromuscular system became efficient at 75 rpm. That efficiency is real, but it does not mean 75 rpm is your physiological optimum — it means your body adapted to the pattern you gave it.
Second, changing cadence is properly uncomfortable for weeks before it becomes neutral, and it takes months before it becomes efficient. Jumping from 78 to 92 rpm overnight will feel terrible, and in the short term, it will be measurably less efficient — not because 92 is wrong for you, but because your nervous system has not yet learned the pattern.
This is one of the most misunderstood aspects of cadence research. People try a higher cadence for one ride, notice it feels worse, and conclude it is wrong for them. That is like trying a new saddle for fifteen minutes and declaring it does not fit. The adaptation curve is real, it is weeks long, and it needs to be factored into any self-experimentation.
Intensity Changes the Equation
Your optimal cadence is not a single number. It changes with intensity.
At low intensities — endurance rides, Zone 2 — the muscular cost of each pedal stroke is modest regardless of cadence. There is less to be gained by spinning faster because the force per stroke is already low. Self-selected cadence at Zone 2 tends to be 3-5 rpm lower than at threshold, and that is appropriate. The trade-off does not demand the same compensation.
At threshold and above, the picture shifts. Power output is high, force per stroke matters more, and the benefits of distributing that force across more pedal strokes become more pronounced. Most riders naturally increase cadence as intensity rises — and the research says they should. The Lucia data showed the gap between economical cadence and self-selected cadence widening at higher intensities. The riders spun even further above their most efficient rate when the power demands increased, because muscular fatigue management became more urgent.
At very high intensities — VO2max efforts, sprints — cadence can climb above 100 rpm even in riders who sit at 88 for most of their riding. This is the body's attempt to move force production away from the already-taxed muscles and toward the cardiovascular system, which can absorb a short spike in demand.
If you find yourself naturally shifting cadence with intensity, your body is doing exactly what the research predicts. If your cadence stays rigidly constant across all zones, that is worth examining. You may be overriding a signal your body is trying to send.
Terrain: The Variable People Get Wrong
The conventional wisdom — maintain your cadence regardless of terrain — is wrong. Field data from professional racing and laboratory studies on graded cycling both show that cadence drops on climbs, and it drops for sound biomechanical reasons.
When the road tilts uphill, gravitational resistance increases. At the same power output, you are typically in a harder gear relative to the gradient, and cadence naturally falls unless you actively shift to maintain it. But the deeper reason is that climbing changes the force-velocity relationship of the pedal stroke. Gravity provides a component of resistance that is constant through the crank rotation, unlike flat riding where inertia carries you through the dead spots. This means each pedal stroke on a climb requires more consistent muscular engagement, and the neuromuscular pattern that serves you on the flat is no longer the best option.
Professional climbers — riders who train and race at altitude on gradients above 7% — typically settle at cadences 5-10 rpm below their flat-terrain preference. A rider at 92 rpm on the flat might sit at 82-85 on a sustained climb. Forcing flat-road cadence uphill wastes energy because it requires overly rapid gear changes, disrupts the force-velocity pattern, and often demands cadences that the available gearing cannot support anyway.
The exception is seated time-trialling, where cadence tends to sit 2-3 rpm above self-selected flat-road cadence. The fixed position, aerodynamic constraints, and sustained effort duration make the muscular-fatigue trade-off even more favourable toward higher rpm. And in practice, the smoother road surface and absence of gradient changes make higher cadence easier to maintain.
How to Know If Your Cadence Is Costing You
This is the practical question. You understand the science now — the trade-off between muscular and cardiovascular cost, the role of VO2max, the influence of training history and intensity and terrain. But how do you apply this to yourself?
There are several signals that your current self-selected cadence may not be serving you well.
Your fitness has changed but your cadence has not. If your FTP has risen 30 watts in the past two years, your VO2max has almost certainly improved alongside it. Your cardiovascular system can now support a higher pedalling rate than it could when your cadence habits were formed. A cadence that was appropriate at 220W FTP may be unnecessarily low at 260W FTP. Your muscles are still bearing cost that your cardiovascular system could now absorb.
Your legs fail before your lungs. If you consistently finish long rides with dead legs but comfortable breathing, the balance between muscular and cardiovascular cost is skewed toward muscular. A modest cadence increase — 3-5 rpm — would shift some of that load to your cardiovascular system, which clearly has capacity to spare.
Your cadence does not change with intensity. If you pedal at 82 rpm whether you are doing Zone 2 or threshold intervals, your neuromuscular system is locked into a single pattern. The research strongly suggests that cadence should rise with intensity. Rigidity here usually indicates a training history effect rather than a physiological preference.
You have never ridden consistently at a different cadence. If your cadence has sat within a 3 rpm band for five years, you have not given your body the information it needs to find a genuine optimum. Self-selected cadence is only reliable as a signal when it emerges from exposure to a meaningful range. A rider who has only ever pedalled between 78 and 82 cannot claim that 80 is their optimum in the same way that a rider who has spent months at 70, 80, 90, and 100 can say 88 feels right.
You grind on fatigued legs. If your cadence drops below 70 late in rides — not because the terrain demands it but because your legs are too tired to turn faster — you were probably carrying too much muscular load earlier. Starting the ride at a slightly higher cadence often preserves enough muscular capacity to maintain better form throughout.
The Framework: Where Science Meets Your Pedals
Here is a simple framework drawn from the research, not from opinion.
Your self-selected cadence is likely close to correct if you have been riding seriously for more than three years, if you have experimented with a range of cadences, and if your current fitness is not dramatically different from when the habit formed.
Your self-selected cadence may be too low if your fitness has improved significantly, if you have never deliberately trained at higher cadences, if your legs consistently give out before your lungs, or if your cadence is more than 10 rpm below what the VO2max-cadence relationship predicts.
Your self-selected cadence may be too high if your breathing is the limiting factor on long rides rather than muscular fatigue, if you struggle to maintain power above threshold without your heart rate spiking, or if you have a modest VO2max and are forcing a professional-calibre cadence because someone told you 90 rpm is the target.
The research does not prescribe a number. It prescribes a process: understand the trade-off, assess your current position within it, and adjust gradually if the signals suggest adjustment is warranted. Your body has been doing this calculation silently for every ride you have ever done. The science just gives you the language to listen to what it is telling you.
What This Means for You
Cadence is not a setting you configure once and forget. It is a dynamic output of your physiology, your fitness, your fatigue state, the terrain, and the intensity of the effort. The riders who get the most from it are not the ones who hit a specific number — they are the ones who understand why the number exists and let it move when conditions demand it.
If you have read this and started questioning whether your cadence has drifted into habit rather than genuine preference, that is exactly the right question to be asking. The answer requires riding at cadences that feel uncomfortable for long enough to let your neuromuscular system adapt, and then honestly assessing whether the new pattern serves you better.
The science says your body is already a sophisticated cadence calculator. Your job is not to override it with a number from a magazine. Your job is to give it enough information — enough exposure to different cadences, different intensities, different terrains — to arrive at the right answer on its own.
If you want to talk cadence with riders who are actually working on this stuff — and coaches who can look at your specific data — come join us in the Roadman Cycling community on Skool. The conversation is always better when there is real data behind it. Join us here.