Cycling Achilles Tendon Issues: How Pedaling Angle and Cleat Adjustment Affect the Achilles Tendon

Introduction

The Achilles Tendon is the thickest and strongest tendon in the human body, connecting the calf’s gastrocnemius and soleus muscles to the heel bone. It bears tremendous repetitive tension during the pedaling motion of cycling. Although cycling is a low-impact sport, each pedal stroke requires dorsiflexion and plantarflexion of the ankle joint. Accumulating over 5,000 times per hour, the microtrauma inflicted on the Achilles tendon is considerable. Among Taiwan’s triathletes and long-distance cycling groups, the incidence of Achilles tendon issues is no less than that among runners.

Achilles Tendon Mechanics in the Pedaling Motion

Achilles Tendon Tension Changes Throughout One Pedal Revolution

Dangerous Pedaling Habits

Heel Drop pedaling style: At the bottom of the pedal stroke, the heel sits noticeably lower than the toes, forcing the Achilles tendon to be overstretched under high tension. This is a primary trigger for Achilles tendinitis.

Toes Down pedaling style: Conversely, although excessive downward pointing may appear powerful, over time it tends to compress the Achilles tendon in a shortened position, causing injury through a different mechanism.

The ideal pedaling angle: the foot is nearly horizontal, or the heel is slightly higher than the toes by no more than 5–10 degrees.

The Impact of Cleat Fore-Aft Position on the Achilles Tendon

Biomechanical Principles of Cleat Position

The fore-aft position of the cleat on the shoe sole directly determines the force transmission point and the length of the ankle joint moment arm:

• Cleat too far forward (near the toes): shorter effective moment arm, requiring more ankle joint stability, increasing Achilles tendon tension
• Cleat too far back (near the heel): the rear of the foot bears the load, pedaling efficiency decreases, but Achilles tendon load is reduced—this is actually a temporary solution for those with Achilles tendon issues
• Standard position: cleat aligned with the first metatarsal head (ball of the foot, MTP joint)

How to Determine if Cleat Position is Correct

1. Put on your cycling shoes and use your fingers to feel along the side of the shoe to locate the prominence of the first metatarsal head
2. Make a mark
3. Compare it with the center of the cleat; the two should be vertically aligned

Wedges and Sole Thickness

The Function of Wedges

Wedges are placed under the insole or between the cleat and the sole to adjust the inward/outward tilt angle of the forefoot (pronation/supination).

• Medial wedge (Varus wedge): raises the medial side of the arch, suitable for riders with collapsed arches (flat feet), reducing oblique tension on the Achilles tendon caused by knee valgus
• Lateral wedge (Valgus wedge): suitable for high-arched feet, reducing ankle eversion

Incorrect foot biomechanics (such as overpronation) cause the Achilles tendon to bear non-axial tension during pedaling—a common yet often overlooked cause of chronic Achilles tendinitis.

Sole Stiffness

Modern high-end cycling shoes feature carbon fiber soles with extreme rigidity for optimal pedaling efficiency, but this also means the foot cannot “absorb” any impact—all forces are transmitted directly to the Achilles tendon and knees. Beginners or riders with Achilles tendon issues may consider transitioning with cycling shoes made of softer synthetic materials.

The Relationship Between Saddle Height and the Achilles Tendon

Saddle too low: the knee bends excessively at the bottom of the pedal stroke, keeping the triceps surae shortened throughout, causing the Achilles tendon to be repeatedly compressed in a shortened state (a trigger for insertional tendinopathy)

Saddle too high: the heel is forced to drop at the bottom of the pedal stroke, overstretching the Achilles tendon (a trigger for mid-portion tendinopathy)

Scientific Methods for Achilles Tendon Rehabilitation

Eccentric Training (Eccentric Protocol)

The most evidence-based rehabilitation method for Achilles tendinitis is the Alfredson Protocol:

1. Stand on the edge of a step with your heels hanging off
2. Use the healthy leg to rise up onto your toes (concentric contraction), then switch to the affected leg and lower slowly (eccentric contraction)
3. 3 sets × 15 repetitions, twice daily, for 12 consecutive weeks
4. Continue even with mild pain (but stop if there is severe pain)

Timeline for Returning to Cycling

Practical Recommendations

1. Warm up your calves before every ride: perform 20 standing calf raises in place to activate the calf muscles
2. Stretch your calves after riding: face a wall in a lunge position, keep the back leg’s knee straight, and feel the stretch in the Achilles tendon, 30 seconds × 3 times per side
3. Increase training load progressively: for long rides (>100km), increase weekly mileage by no more than 10%
4. Taiwan medical resources: for Achilles tendon issues, it is recommended to consult an orthopedist or a rehabilitation specialist. Ultrasound can clearly show Achilles tendon thickness and structure, making it the most practical non-invasive assessment tool

Conclusion

Achilles tendon issues often accumulate from small details that go unnoticed—an incorrect cleat position, a pair of ill-fitting cycling shoes, or a saddle set too high or too low can all be culprits behind Achilles tendinitis. Starting today, check your pedaling angle and cleat setup so that your Achilles tendon can work in the healthiest way possible with every pedal stroke.

Related Reading

• Tendinitis Prevention and Recovery for Cyclists: A Complete Guide to the Knee, Achilles Tendon, and IT Band
• Foot Pain in Cyclists: Cleat Position Adjustment and Arch Support
• Tendon Protection in Ultra-Endurance Cycling: A Complete Guide to Preventing Achilles Tendon and IT Band Injuries
• The Achilles Tendon Doesn’t Just Break Down Overnight: A Full Breakdown of Achilles and Calf Pain Mechanisms, Eccentric Training, and Load Management