At the front the straps tie into the structure slightly lower than the old version and they are thinner. The new design uses multiple pieces with different properties in different areas. The previous straps used a single piece of fabric for the complete system. That's about double the elastane of other brands and it's enough to keep the Free Aero RC feeling snug and compressive without needing any silicone.Īs Castelli revised the design, one place that did not see any simplification was the design of the straps. The new design has no silicone grip and instead uses a "brand-new 215 g/m² double-face circular-knit fabric" that's 32 per cent elastane. Some of the changes to the panelling, which benefits aerodynamics, is the loss of a bottom panel that includes silicone grip material. In fact, some of those other advantages align perfectly. A 300-watt effort becomes a 302-watt effort for bibs that have other advantages. Granted, 0.7 per cent isn't much, but what's important is that it's there as a bonus. The end result seems to have worked with aero figures quoted as "very close to the outgoing short at 0-degrees yaw" but 0.7 per cent faster when yaw changes to 5 per cent or greater. Castelli has moved away from using texture to keep the air attached and instead smoothed and minimised seams. However, the simplification of panels goes hand in hand with an updated aerodynamics understanding. As part of that change is the loss of the 3D texturing that defined the aero detailing of the previous generation. While the previous generation had ten panels to make up the shorts, that has now dropped to half the number with a total of five. With the Free Aero RC the process has been simplified at every opportunity. There are a lot of panels and a lot of aero detailing. The previous Castelli Free Aero Race 4 is a complicated bib short. In an effort to make the Free Aero RC bib short an all-day option as well as a race-day option, one of the biggest things that's different in the new version is the level of simplification. That's a little bit different than the language used in the past and it sets the stage for what these bibs are.
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