Knee pain while cycling: causes, solutions, and prevention

You're out on a ride and suddenly you feel pain in your knee—at the front, on the side, or behind the kneecap. No matter the exact location, the signal is the same: something is not right. Knee pain while cycling is one of the most common complaints among cyclists of all levels. The good news: in the vast majority of cases, the cause is mechanical and can be corrected without medical intervention. A saddle adjustment, a cleat adjustment, sometimes a simple change in cadence—and the pain disappears. But you need to know where to look. Here are the most common causes and concrete solutions to address them.

A professional bike fitting session measures each joint in motion—the majority of knee pain originates from a minor adjustment detail.

Why is the knee so vulnerable when cycling?

While cycling, the knee performs a repetitive motion with each pedal stroke. On a two-hour ride at 80 RPM, that's approximately 9,600 flexion-extensions per knee. This figure alone explains why even the slightest positioning defect—even by a few millimeters—can lead to irritation. Pedaling amplifies imperfections.

Unlike running, where each stride is absorbed by a suspension phase, pedaling is a continuous motion with no rest for the joint. Tendons, ligaments, and the kneecap bear the brunt of each repetition. When the axis of movement is not respected, wear and tear accelerate, and pain eventually sets in.

The most common causes of knee pain while cycling

Several factors can cause your pain. The most common among amateur and regular cyclists are:

• Saddle too low → the knee bends excessively at the bottom of the pedal stroke → tension on the patellar tendon → pain at the front of the knee
• Saddle too high → the knee is hyperextended at the bottom dead center → pain at the back or on the inner side
• Saddle too far forward or too far back → the knee moves out of its natural axis with each push
• Poorly adjusted pedal cleats → the foot is forced into an unnatural position, creating lateral torsion with each pedal stroke
• Gear too high → too much force applied with each pedal stroke, especially uphill
• Crank arm length unsuitable → often overlooked, it can force an excessive range of motion for your body type

Most of the time, just one of these causes is enough to trigger pain. And the most frequent culprit remains saddle height.

Saddle height: the first adjustment to check

Saddle height is by far the most common cause of knee pain while cycling—and it's often the adjustment that is overlooked for the longest time. A simple test to check: place your heel on the pedal at the bottom dead center. Your leg should be fully extended, without your pelvis tilting. If you have to stretch to reach the pedal, the saddle is too high. If your knee is still bent, it's too low.

A saddle that is too low repeatedly compresses the patellar tendon, causing pain at the front of the knee (patellofemoral syndrome). A saddle that is too high leads to slight hyperextension with each push, causing pain at the back or inner side. In both cases, a few millimeters of adjustment can make all the difference.

A few millimeters of saddle height are enough to eliminate knee pain—or to create it.

Pedal cleats and knee alignment

If you use clipless pedals, your cleats play a central role in your knee health. A poorly positioned cleat forces the foot into a constrained angle, which creates lateral torsion of the knee with each pedal stroke—multiplied by thousands of repetitions on a ride.

The angle and position of the cleats determine knee alignment with each pedal stroke.

Two parameters are particularly important: the fore-aft axis (the ball of the foot should be approximately above the pedal axle) and the rotational angle. Many people naturally have their feet turned out or slightly pointed inwards. Adjustable float cleats allow the foot to find its natural position without being forced into a fixed angle. If lateral pain persists despite correct saddle adjustment, cleats are the next thing to examine.

When to consult a professional?

If the pain persists after correcting saddle height and checking cleat alignment, it's time to move on to the next step. A sports doctor or physiotherapist can determine if a structural cause is involved—tendinitis, IT band syndrome, patellofemoral syndrome. These conditions respond well to treatment, but recovery will be incomplete if the underlying mechanical problem is not resolved in parallel.

For a complete diagnosis of positioning, a bike fitting session is the most effective solution. At Bicycles Quilicot, we offer the Retül bike fitting service—a 3D motion capture system that analyzes your pedaling in real time and precisely identifies the imbalances that cause pain. The majority of cyclists who suffered from knee pain see significant improvement after just one session.

Retül 3D capture identifies imbalances invisible to the naked eye—joint angles, left/right asymmetries, parasitic knee movements.

Frequently asked questions

Front or back knee pain—is it the same cause?

No. Front knee pain (under or around the kneecap) is most often related to a saddle that is too low or poorly adjusted cleats that compress the patellar tendon. Back knee pain usually indicates a saddle that is too high, which forces slight hyperextension with each push. The location of the pain is your first diagnostic clue.

Why does knee pain tend to surface specifically during the spring return to riding?

This is what's known as spring knee — a form of patellar tendonitis brought on by resuming training too aggressively after the winter break. Stacking long rides back-to-back doesn't give the tendons and stabilizing muscles (vastus medialis, gluteus medius) the time they need to readapt to the workload. The remedy is straightforward: increase your volume progressively, keep the knees covered when temperatures are below 15 °C, and devote 10 to 20 % of your ride time to activation (a very easy opening 10 minutes), stretching, and stability exercises.

Can I continue riding with knee pain?

With caution. A slight discomfort at the beginning of a ride that disappears after a few kilometers is often a sign of mechanical irritation that you can correct with adjustment. However, pain that increases during the ride or lasts for several days is a stop signal. Continuing to force an inflamed joint worsens the situation and prolongs recovery.

How long does it take for the pain to disappear after an adjustment?

It depends on the level of inflammation. If you act quickly, a saddle height correction may be enough to eliminate the pain in a few rides. If the pain has been present for several weeks, the connective tissue needs time to recover—allow two to four weeks of lighter rides after the adjustment.

Can a Retül fitting really fix chronic knee pain?

In the majority of cases, yes—if the cause is mechanical. Retül fitting precisely identifies off-axis parameters (saddle height and setback, cleat position, stem length, crank arm length) and corrects them with objective measurements. For cases where a structural pathology is involved, fitting is complementary to physiotherapy follow-up.

Conclusion

Knee pain while cycling is rarely inevitable. It is almost always the consequence of an adjustment that needs correction—saddle height, cleat position, crank arm length—that a few adjustments are enough to solve. Start with basic checks, reduce your gearing on climbs, and observe if the situation improves. If the pain persists, a specialized consultation will allow you to identify the precise cause and get back on your bike without compromise. At Bicycles Quilicot, our Retül fitting service is specifically designed for this.