fbpx

All you need to know about pedal-foot interface and power transfer

It is an undeniable fact that you need comfortable saddle and handlebars for a smooth, enjoyable cycling experience. But we often forget about the pedal-foot interface. It is actually one of the most important aspects of the bike as the power transfer occurs in the pedal-foot interface.  This is where the energy is transferred from the body to the bike.

Most studies are primarily focused on cycling injuries of neck, arms, perineum, buttocks, and knees. The injuries are all related to saddle and handlebar set-up and design. There’s rarely any comprehensive scientific study involving foot injuries in cyclists, specifically the pedal-foot interface.

Thanks to scientists in Australia, a recent study has been carried out to identify the various types of foot injuries suffered by cyclists, in general, and how frequent they are:

 

The science behind the study of power transfer

The researchers tried to answer these questions about foot injuries confronted by riders:

  1. What are the gender, age, foot and pedal interface cyclists use? 
  2. How much distance the did the cyclists cover who experienced foot pain?
  3. What is the classification of the foot pain and which regions of the foot the cyclists experience pain the most?
  4. Define the styles cyclists typically try to counter/overcome foot injuries or pain?
  5. Are there any particular groups of cyclists who may be more vulnerable to foot pain/injuries than others?

An electronic survey compiled the information from cyclists residing in South Australia. A total of 397 cyclists participated in the survey.

The riders provided information regarding their cycling routine. They also told how frequently they cycled, and their interactions with the pedal interface (clipless/toe-straps) or power transfer. In addition, they explained what kind of foot pain they encountered.

 

The findings

 

The first thing the scientists found out was that more than half (53.9 percent) of the cyclists experienced foot pain while riding. Secondly, 61 percent of the foot pain was in the forefoot region. The report explained the forefoot region is most prone to pain.

The cyclists also reported the pain was mostly on their toenails, toes, and ball of the foot. Speaking of the pain, the cyclists described the pain feels like a ‘numbness” or “a burning sensation”.

The cyclists remediated the pain by stopping in the middle of the ride, shoe removal, massaging or stretching the foot, and walking. Meanwhile, riders, who ride with an attached foot-pedal interface via toe-straps/cage/clipless techniques, were 2.6 times more vulnerable to suffer from foot pain or injuries. Cyclists above 26 years of age were more likely to have foot pain than riders who are under 26 years.

 

Pressure on the foot

 

According to Jeremy Mok, avid cyclist and senior physiotherapist at The Sole Clinic, forces when cycling are generated from the hip, knee and ankle joint. The ankle produces about 20% of the total force in the lower limb in seating cycling. As the foot is in direct contact with the drive-train, huge pressure and load go through the foot during each pedal stroke.

“The use of cleats in cycling shoe is very common and the main benefit is that it provides an efficient pedal stroke by allowing the shoe to remain in greater contact with the pedal during the recovery phase (upstroke).

On the other hand, poorly fitted cleats in cycling shoe will affect the foot and shoe position, this not only will create foot stress and increase pressure on the metatarsals, it will also potentially cause knee pains,” says Jeremy.

 

READ more:  Top 3 reasons behind cycling leg pain

Solutions

    • Proper bike fit, to adjust cleat position – fore-aft, inter-pedal width, cleat lateral-medial rotation 
    • Purchasing cleats with a greater degree of float ( away from 0deg, to 4 or 6 deg of float)

Other cause of foot pain in cycling which might not be due to the use of cleats could be due to an anatomical difference in foot structure, or muscular imbalance.

 

Foot structure

• Foot deformities
Having some foot deformities such as a bunion, hammertoe and calluses on the bottom of your feet can cause metatarsalgia.
• Foot shape / Arch type
High arch put extra pressure on the metatarsals. Having a second toe that’s longer than the big toe causes more weight to be shifted to the second metatarsal head.

 

Muscle Imbalances

  • Weakness and tightness in the gastroc-soleus complex, quadriceps/hamstrings or even the hip muscles

    According to  Principal Podiatrist Kelvin Tay, depending on the foot condition of the cyclist, you can get prescribed customised slim fit insoles that can be fitted into cycling shoes.

    The insoles will assist in correcting any lower limb biomechanical misalignment during cycling, and redistribute pressures on the feet away from painful areas if required.

 

The takeaway

This research gives us a preliminary insight to showcase how common foot pain/injury is among cyclists. The studies also show that the “cleated in” shoes are linked with foot pain as these cycling shoes tend to localise plantar pressure. This can affect the integrity of the nerve and blood supply to that region.

In a nutshell, the findings suggest that the design of cycling shoes is just as important as the saddle and handlebar of the bikes. That is if you want to stay pain-free during cycling.

Mizah Salik

Author: Mizah Salik

Writer | Editor | Storyteller | Data geek | Aspiring Photographer
When she’s not writing, Mizah is constantly wired 24/7. She loves cats, cycling at night, and can’t survive without her weekly dose of chicken rice.

SUBSCRIBE TO OUR NEWSLETTER!
Get the latest tips, how tos, reviews and cycling news!
We hate spam. Your email address will not be sold or shared with anyone else.

More from SPORTSINCYCLING