Knee Pain When Cycling: What It Means and How a Fit Fixes It

By Mike · Updated 13 July 2026

Knee pain is the most common problem that walks through our fit studio door, and it is also the most fixable. The knee is caught between two fixed points, your foot on the pedal and your pelvis on the saddle, so when either of those contact points is in the wrong place, the knee absorbs the error a few thousand times every hour. The encouraging flip side: move the contact points correctly and the pain usually resolves.

Where your knee hurts tells us a lot about which contact point is wrong. Here is how we read it. This is general guidance rather than a diagnosis; persistent or sharp pain belongs with a physiotherapist.

Pain at the front of the knee

Pressure or ache around or under the kneecap most often points to a saddle that is too low, too far forward, or both. A low saddle keeps the knee deeply bent at the top of the stroke and drives the kneecap hard against the groove it slides in, over and over. Riders who feel this often also feel their quads doing all the work.

The usual fixes are raising the saddle toward correct extension and checking setback, so the knee is not driving down in front of the pedal axle. If you suspect your saddle is the problem, our saddle height guide covers the symptoms of low and high in detail.

Pain at the back of the knee

Ache behind the knee, or a hamstring that feels overstretched, is the mirror image: a saddle that is too high or too far back. The leg over-extends at the bottom of the stroke, and to reach the pedal the hips often start rocking, which brings its own problems in the saddle-comfort department. This one is common after a new bike or a new saddle, when height was transferred across by eye.

Pain on the outside or inside of the knee

Side-of-knee pain, including the classic burning line down the outside of the thigh to the knee, usually points to the foot rather than the saddle: cleat rotation that fights your natural foot angle, cleats positioned too far in or out, or a stance width that forces your knees to track in a line their anatomy does not want. Feet are not symmetric, so we set cleat fore-aft, rotation and lateral position on each shoe individually rather than mirroring one side onto the other.

When the cause is not on the bike at all

Sometimes the measurements are right and the knee still complains. In a functional fit we watch how you actually move: a hip that drops on one side of the pedal stroke, a pelvis rotated slightly on the saddle, knees that dive inward as you fatigue. These patterns come from tight or weak muscles, commonly the glutes and hip flexors, and they load one knee unevenly no matter how well the bike is set up.

That is why our fits include an off-bike movement assessment, and why clients whose pain traces to a strength or mobility issue leave with a six-week corrective exercise program alongside their new position: mobility and activation work first, then single-leg strength to address the asymmetry, then integration back on the bike. Fixing the bike without fixing the pattern is a temporary fix.

What to do this week

Do not ride through it, and resist the temptation to change three things at once. If the pain is new, check the obvious: has your saddle slipped, are your cleats worn, is this a new shoe or pedal. If the pain is recurring or one-sided, that is a position and movement problem, and guessing with an Allen key in the garage usually adds new variables rather than removing them.

A 90-minute functional fit at our Cheltenham studio works through every cause on this page in a single session, with before and after measurements documented so you know exactly what changed. And if you are buying a bike and want to avoid importing an old pain onto a new frame, read our guide on fitting before or after buying first.