Cycling knee pain doesn't usually mean your knee is the problem.
It usually means your saddle is too low, your cleat is rotated, or your bike fit drifted three millimeters across the winter.
What's actually going on.
Cycling knee pain almost always has a fit cause and a biomechanical signature. Pain at the front of the knee (anterior, around the kneecap) usually means the saddle is too low; the knee flexes too much at the top of the pedal stroke and the patella loads against the femur every revolution. Pain at the back of the knee (posterior) usually means the saddle is too high; the leg overextends. Lateral knee pain points at cleat rotation or at IT-band tension (covered separately).
Reported prevalence of knee pain in cyclists ranges from 36% to 62% across studies. Patellofemoral pain is the most common overuse injury after lower-back pain in cyclists. Source: Wanich et al., systematic review of cycling overuse injuries (PubMed Central).
Raise the saddle 3–5 mm.
The first adjustment a fitter would try, taken straight from the BikeFit app.
If the pain is at the front of the knee, the most likely culprit is a saddle that's too low. Excessive flexion at top dead center loads the patellofemoral joint every pedal stroke. Three to five millimeters is the standard starting increment — small enough to ride in without rebuilding your cleat position, large enough to feel a difference within 10 to 20 minutes.
If the first one didn't fix it, here's the rest.
Each step routes based on whether the previous adjustment helped. The app never repeats the same direction it just tried.
- 1Saddle height. Raise or lower 3–5 mm depending on whether the pain is at the front of the knee (raise) or back of the knee (lower).
- 2Saddle fore-aft. Move the saddle forward 2–4 mm if pain persists. The knee should track over the pedal spindle at the 3-o'clock crank position.
- 3Cleat rotation. Adjust cleat rotation 1–2° based on which side of the knee hurts. Most fitters tune this last because it's the hardest to feel.
- 4Cleat fore-aft. Move cleats back 2–4 mm to reduce forefoot load and indirectly relax the calf-knee chain.
- 5Crank arm length. If you've worked all four and pain remains, longer cranks may be loading the knee at extremes. The app tells you when this is the path.
Most cyclists resolve the symptom within these 5 adjustments. If you've worked all of them and pain remains, BikeFit tells you so and recommends a professional fitter or healthcare provider.
Try the first adjustment tonight. Ride tomorrow. Know by Saturday.
$4.99 one-time. Apple's standard 14-day refund. No subscription, no tracking, no waiting for a fitter's calendar.