The Power of Insoles in Bike Fitting

This article was originally published by Tom Wiseman at

There is a great deal of debate in the bike fitting world about shoe insoles. Some fitters love them and use them in every fitting while some fitters don’t believe insoles make a “hill of beans” difference. In my bike fitting practice, I find myself often using insoles to solve problems with not just the foot but also pain and discomfort all up and down the kinetic chain. Like a different length stem or a set of extended pedal spindles, insoles are just one piece of equipment that might help solve issues I encounter during the process of a bike fitting.

“Stock insoles are just a flimsy cover for the inside of the shoe.”

Over the years I have used a wide variety of insoles. Everything from Solestar, Pearl Izumi, Shimano, Lake, E-Soles, and G8 Performance among others. Some are more expensive and some are not. Some are heat-moldable and some are just a simple “slip in” that are not much better than the woefully inadequate insoles that come with the majority of cycling shoes. One thing that almost all fitters I have spoken to agree on is the “stock” insoles of cycling shoes (or any shoes for that matter) are just a flimsy cover for the inside of the shoe.  

While fitters admittedly use insoles for a wide variety of reasons, the primary reason I use an insole is to increase foot stability. Without going into a ton of detail about feet, they are the main connection and point of power transfer to the bike and work in 3 planes of movement. I like to describe the stabilization of the feet in cycling similar to the difference between standing on flat ground and standing on an exercise ball or Bosu ball. It is surprising how many people have trouble standing on flat ground as demonstrated with a Romberg’s Test. Now put your feet on a dynamic machine traveling at 20mph on varied terrain while your legs spin at 90+rpm. It should be extremely clear how stability plays a roll in control and efficiency in cycling. 

Proper Insoles Provide Stability

How does an insole (any insole) improve the stability of feet? They do this in a couple of ways. Improving the brain’s awareness of where the feet are in space is a concept called proprioception. This is achieved by stimulating the nerves of the foot located in the fascia along the bottom of the foot. For some people, this is a “game-changer” for stability on their bike. When their feet start working better as a result of the brain’s improved connection neurologically with what has been a black hole at the feet, stability up the kinetic chain is often greatly improved. Another way stability is improved with some people is by making the shoe shape more closely resemble the foot. Some people have high arches and aside from the proprioception component, the weight of their body is poorly supported by the shoe. Improving contact across the whole base of the foot and spreading the load out over more surface area help some people find stability without having to claw their toes in the front of the shoes. Sometimes this also helps with hot spots and numbness by loading a larger surface area and relieving pressure at the forefoot. 

Years ago companies like Superfeet and Pearl Izumi were the go-to insoles here in the United States because of easy availability for many fitters based in bike shops especially. E-Soles was a great option with several arch heights but some people found the immobile fixed arch too intrusive or uncomfortable. Some of the heat-moldable insoles from companies like G8 Performance and Lake Cycling and even moldable shoes from Bont work well but are still not as versatile and require time for proper setup. The Pearl Izumi insoles provided some adjustability with both different arch height options and forefoot wedges that slipped into “pocket” like spaces cut in the insole. These were somewhat effective well but did not provide options for people with very high arches and did not flex enough for some people to find comfort. Many other companies were viable options but importing them from overseas was too expensive and not cost-effective for sales in the USA.   

The Best Value and the Most Versitile

Given all this time working with so many different types and styles of insoles, I have found some achieve better results than others. One, in particular, seems to be not only the best value but also the most versatile for bike fitting specifically. The G8 Performance 2620’s are the best I have found for all these issues described above and more. These were first only available from Australia but with the great people at BikeFit now importing them to the states, prices have dropped and availability is better.  With 5 different arch heights and the ability to place the arch in a variety of positions under the foot, these are capable of getting that custom fit necessary to solve my client’s issues. They even offer heel wedges to attach directly to the insole for a clean and finished look. They are durable and easy to clean making them a long lasting and exceptional value for both road and mountain bike use. Because of the flexibility built into the arches, the G8 2620 allows the foot to still operate the way it was intended and flex and move while in a rigid shoe. 

I encourage everyone to pull their insoles out of their cycling shoes and give them a good inspection. If they look badly worn or folded and curled, toss them in the bin. You do not want to touch them let alone take them out of your shoe? If they are not making your feet happy and you are experiencing pain or numbness give me a call and set up an appointment to have these things looked at and remedied. The power of a good insole can be felt all the way up the kinetic chain to your head in a stable and powerful position. When your feet are stable the pelvis is more stable. When the pelvis is more stable the core below the diaphragm works less and saves energy. When the core below the diaphragm works less the chest and ribcage can relax and expand to take in more oxygen instead of trying to stabilize an unsteady pelvis because of unstable feet. The kinetic chain is entirely effected by the ability of the feet to apply force smoothly and efficiently. The option is to suffer in a pair of shoes with insoles like the ones pictured below. Happy riding and cheers to you.

Tom Wiseman

BF Podcast Ep. 5: The Foot is a Microcosm with G8 Performance CEO David Lee

Ep. 5 Sponsor: Festka

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In Episode 5, I connected with CEO and founder of G8 Performance, David Lee.  While there is, of course, some inherent bias as I need to mention that BikeFit is the North American distributor of G8 insoles, the conversation with David is not a sales pitch but rather an exploration of the often ignored and overlooked extremity of the body: the feet.

David transitioned from an investment banker to a member of an elite special forces unit in the US Army to the eventual company owner and relentless advocate for the promotion of foot health.  He focuses on on the foot as a microcosm of its own rather than the belief that the “foot is just a lever.”

We discuss the dangers of current footwear, how they significantly impact and injure the feet, the brain’s connection to the feet, and the imperative need to promote movement and blood flow within the foot during any type of athletic activity.

The Dive: Ep. 5 Topics:

  • Foot movement during force expulsion
  • How the use of modern running and cycling shoes affects nerve receptions and muscle atrophy
  • The Golden Ratio 1:1.618 as seen in the pyramids and the Mona Lisa.
  • Cycling shoes are worse than running shoes
  • The foot as a lever vs. its own piece of complicated machinery
  • Calf and Achilles issues in cycling
  • The foot is an ecosystem–an ant mound.
  • The foot has the highest concentration of nerve endings in the body
  • Comparing insole types
  • Foot function and movement in the shoe
  • Rehabilitation possibilities of an insole
  • G8 benefits
  • The connection, or lack there of, with brain to foot based on insole
  • Foot correction affects other parts of the kinetic chain
  • The lifecycle of an insole
  • Benefits of a flexible orthotic
  • Bike fitting and injury prevention should start with the foot

David references a number of scholarly articles in the podcast.  Please see the links below for more information:

David Lee’s approach to the health of feet is simple: to reduce injury and increase athletic performance for everyone, whether you are a professional athlete, a weekend warrior, or someone who simply likes to go for a social walk or a bike ride.

David has long understood what it means to have issues with foot pain, numbness, calf cramping, and shin splints, suffering from these since he was a teenager. These issues were exacerbated for him during his time as a soldier in the US Army from 2003, where he worked and trained with US Elite Special Forces, and throughout six deployments, where the pressure and stress on his feet and legs were unparalleled. 

After leaving the army and returning to Australia, David sought solutions to his foot issues, at one time importing an adjustable orthotic device from the United States. This had its limitations, so he ultimately decided to develop his own product – and from there, G8 Performance was born.

David has been active within the performance orthotic industry since 2010, owning G8 Performance since 2012. Unlike other insole and orthotic solutions which merely provide a “band-aid” approach to foot issues, David’s business seeks to actively address the core problems which cause pain in the feet and which can be referred into the legs, ankles, knees and even the hips. He also wants to change the way the industry approaches feet – both in the cycling and sporting arena, as well as in everyday life.

David’s vision for the future is to bring “podiatry to the people” via outlets that prescribe customized foot solutions and which consider the function of the foot within a shoe – regardless of whether it is a cycling shoe, an athletic shoe, or even everyday footwear. With improved dynamic foot health, athletic performance is enhanced and injuries are reduced.


Contact David

G8 Performance


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