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BODY SCANNING - ergonomic bike adjustment

Fitstore24 ZANIER GmbH


The Body Scanning CRM Bike, created through collaboration between orthopaedic surgeons, physiotherapists, cyclists and engineers, is a measuring system that allows customers to be measured and advised without contact in order to find their optimal ergonomic sitting position on the bike and calculate the perfect frame geometries.


We recommend that you have your bicycle adjusted as precisely as possible at your bicycle dealer, because first and foremost, the ergonomic adjustment of your bicycle is based on the correct analysis of your biometric data and the desired purpose of use. A bike setting that is optimally adapted to your body improves power transmission and reduces health risks.


The saddle offset (saddle position) is crucial for a good pedalling feel and power transmission. It is measured from the perpendicular through the bottom bracket axle to the saddle nose. The saddle offset determines the angle between the force acting on the pedal crank and the pedal crank arm. This angle must be optimised for the entire crank revolution (360 degrees). The saddle offset is measured with the Bike Adjustment Device.


The distance between the saddle and the handlebar depends on the length of the upper body and the riding position. It is measured from the nose of the saddle to the position of the handlebar where you grip (on road bikes) or to the top handlebar position (on MTBs with straight handlebars). This distance often determines the length of the bicycle frame. The distance between the saddle and the handlebar is measured with the Bike Adjustment Device or calculated with the top tube calculator if the frame is only available as geometry information from the catalogue.


The steering level is expressed in relation to the saddle. There is a large tolerance field here, as only three basic back positions (comfortable, moderate, sporty) are asked for. In reality, however, there are many positions in between. The three seat positions are always related to the selected bicycle category. The steering level is measured with the Bike Adjustment Device.


The frame size is a subordinate point. First and foremost, the three contact points where you touch the bike are of interest and of great importance for ergonomic well-being. Frame size (usually measured from the centre of the bottom bracket to the centre of the top tube) was an indicator in the days of diamond frames with horizontal top tubes. In the times of sloping top tubes and suspension seat posts, the top tube length is more decisive. See also distance between saddle and handlebars. Your Body Scanning bicycle dealer can give you more information in this case.


In general, a longer crank means more torque, which can be transmitted to the bottom bracket axle. The jump from 175 mm to 177.5 mm means an increase in torque of about 1.5 %. Now you might think that the longer the crank, the better the efficiency of the rider. In theory, this is true. However, you must not disregard the motor skills of the cyclist and the length of his or her legs. In the case of mountain bikes, there is also the ground clearance. Therefore, only crank lengths of max. 175 mm are offered in this category as well. The standard crank length for trekking and city bikes is 170 mm, because here efficiency takes a back seat to comfort. For racing cyclists with performance-oriented ambitions, special categorisations apply.


Every cyclist's ergonomics are different. For example, the ergonomics of the city cyclist is comfortable sitting, good overview of traffic and quick getting on and off at traffic lights. In comparison, the ergonomics of the road cyclist is streamlined sitting, high cadence and optimal power/performance ratio.