Background: Aerodynamics is one of the major factors in cycling performance. Textile optimization is one of the current means used to optimize performances (Brownlie, 2009 ; Chowdhury, 2010). In this context, the International Cycling Union (UCI) wants in 2019 to control the characteristics of textiles by limiting their external surface roughness (the modification of the surface condition must be limited to a height difference of 1 mm, article 1.3.033). Purpose: The aim of this preliminary study is to propose a new method for measuring the roughness of the external surface of different time trial garments. Methods: Eight TT garments with different roughness were tested in laboratory. The external surface of each garment was 3Dmodelled(fig. 1) using the Aliconaâfocus-variation microscope (fig. 2) and the data were analyzed using the Aliconaâsoftware.
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