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What is Retül?

The Retül system uses infra-red LEDs (light emitting diodes) placed on the body of the rider in specific skeletal locations. A 3D scanner is then used to measure the location of each LED 29 times per second. This allows rapid collection of real information about a rider’s position and movement while riding at intensity. Retul is used by a number of top level pro road and triathlon teams including, Team Sky, Orica Bike Exchange and Team Dimension Data for Quabeka.

Why spend thousands of pound on aerodynamic equipment when the rider is the biggest component?

What does a Retül fit include?

The Retül fit process includes 3 components. Before the rider is analysed on the bike, a physiotherapy screen takes place that looks at relative range of movement, flexibility and foot mechanics and structure. The findings are taken into consideration along with the dynamic fit data when individualizing a rider’s position. The client is then analysed on the bike to obtain data on the position they are currently riding. Measurements are taken from both sides to look for any side-to-side differences- not something that is possible through a static or 2-D assessment. The results are then used to make any necessary adjustments (there will be occasions when new components e.g. handlebar stems and/or saddles will need to be fitted). Data is taken again to view the effect of the positional changes. The aim of any fit is to obtain the most comfortable and efficient position and consequently the most powerful.

1. Retül is individual to the rider

When coming to Core Cycling we do a full physical assessment of you the rider. The fit will be for you as we will check your flexibility, core strength and upper body strength. We make sure the bike is the best set up YOU can have. Also looking at what your goals are we really get the most out of your position for your discipline.

2. Retül works in 3D

3D Motion capture allows us to study rider movements in 3 dimensions. A tracing of knee motion is produced automatically each time a set of measurements is taken allowing the fitter to make informed judgments regarding the adjustments needed. No other measurement system can record movement in both front and side views simultaneously.

3. Retül is dynamic

Most bike fit specialists fit riders in a static position. The traditional tools of the trade, tape measures and plumb bobs don’t allow accurate measurements while the rider is pedalling. Retül captures the rider’s position relative to his pedalling motion, and therefore creates the most realistic replication of the actual pedal stroke and body position when out on the road and trails. Using averages, Retül is used in a powerful way. The 29 sets of results are taken from the rider during each second of the measurement period (normally around 15-30 seconds) and then averaged. This gives the Retül system a strong advantage over other motion capture techniques (such as video capture) as no two pedal strokes are the same. Video capture measures angles at a single point during a single pedal stroke.

4. Retül is accurate

Measurements made by traditional tools have one thing in common: they are subject to human error and therefore can be devastatingly inaccurate. Even slight inaccuracies can completely change the rider’s feel after a ride. The general rule is that if you feel pain, something can probably be changed to eliminate that pain. Retül uses motion capture technology accurate to within less than a millimetre, creating true objective data which can be utilized by our fitters for the perfect biomechanical fit.


How can a fit help or prevent injuries?

The fit session itself has several components to it. Each of these provide us with a picture of the individual’s biomechanical profile which then has to be applied to the fit and the position decided upon. A physiotherapy screening, an individual’s injury history along with biomechanics are taken into account during the process. Applying this information to the 3-D analysis ensures the best position for the rider.

Can I transfer my fit to another bike?

Each rider receives a document of their results that includes their individual range of movement taken during the fit and then using the ‘zin’ tool we accurately take measurements of the completed bike position. This allows the client to use the information taken to apply to another bike of the same type, similar geometry and frame size.

Alternatively, we can utilize the Zin tool to digitally dial in a second bike.

How long does a fit take?

On average, 2:30 hours-3 hours. However some fit sessions are more complicated than others either caused by the riders injury history or simply by their pedalling mechanics and sometimes large functional asymmetries.

What do I need to bring with me?

To the fitting session, you will need to bring with you your bicycle, a set of appropriate cycling shoes and a set of shorts (preferably Bib Shorts) and short-sleeved top (ideally tight fitting to prevent any unwanted movement of the LED markers).

Services & Prices

Single bike fit – £185

Time: 2:30-3 hours

Biomechanical analysis/cycling specific assessment – Dynamic data capture of 3D full body movements using power output and physiologic response to help determine optimal position – Comprehensive digital report of 3D and 2D body parameters as well as 3D bicycle fit coordinates.

Test Protocol

  • 1 Bike fit
  • Detailed report including Bike Fit dimensions

2 bikes fitted in the same session – £320

Time: 4-5 hours.

Biomechanical analysis/cycling specific assessment – Dynamic data capture of 3D full body movements using power output and physiologic response to help determine optimal position – Comprehensive digital report of 3D and 2D body parameters as well as 3D bicycle fit coordinates.

Test Protocol

  • 2 Bike fits
  • Detailed report including Bike Fit dimensions

Single bike redial or check of position – £90

Follow up appointment is available for clients who have already been through their Retul analysis and are in need of adjustment within the first year. This is appropriate for any part changes and recommendations.

Test Protocol

  • 1 Bike fit – Redial
  • Detailed report including Bike Fit dimensions