Replaces the original Fit Kit Colored Charts with a simple, easy to use double sided Slide Chart for projecting a bicycle size.
This is the essential data calculator used in the Fit Kit System of Bicycle Sizing.
Now available in digital form from the App store, for use on Apple or Android devices.
Input your customers 4 key body measurements and know in seconds:
- Bike Length of Top Tube and Stem Combination for Road (drop bar) or Mountain Bike (flat bar)
- Saddle Height (recommended range)
- Frame Size (theoretical seat tube length)
You can find the correct frame size at a glance, when you enter your customers inseam, foot, torso, and arm length measurements. This handy instrument will help you identify the correct frame size and initial fit settings. No more guess work, no more standing over the top tube to try to get a good fit, no more “yeah, that looks about right”. Give you and your customers confidence through measurement.
The Fit Kit System incorporates parameters most bike sizing or bike fitting techniques exclude, being both absolute and relative anatomical measurements.
Foot Length and Inseam
Taking the foot measurement is often over looked by bike fit technicians. Many fitters overlook the fact that the pedal stroke does not begin at the heel (raw inseam measurement) but at the forefoot. The Fit Kit System calculations take into account foot length as well as inseam length to predict a suggested seat height range, as a starting position for a bike fit. Two people with the same inseam length but different foot lengths will have a different seat height (all other factors being equal), because the total length of the lever from saddle to pedal will be different.
Torso and Arm
Neither inseam or total body height are accurate predictors of a suitable frame size, due to variations in anatomical proportions.
Torso and arm length are critical components to any bike sizing and fitting system as these influence reach and drop to the bars, and appropriate upper body joint angles. The torso and arm length are another often neglected sizing measurement, but are an integral component of the Fit Kit System.
They ares easily measured with the Fit Kit Systems Torso/Arm Device. Using one device, the fit technician measures the length of the torso, and the length of the arm. When this data is entered in the Frame Sizing Slide Chart as an Upper Body Measurement, a top tube and stem combination is calculated for your customer. The resultant “Top Tube / Stem Combination” is based on empirical data rather than algorithms. It is a solid starting point for a correct bicycle frame size for that cyclist, and is generally MORE IMPORTANT than frame size based on inseam length. The results are calculated for Road Bicycles and Mountain Bicycles, and can be modified for Tri Bikes.
We recommend further refinement of the Top Tube/ Stem combination for the rider by adding in the Soft Score from the 4 key questions in the rider interview. The Quick Fit Worksheet can be downloaded here for use with the Slide Chart. This feature is built into the App version of the Slide Chart, and automatically calculated.