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Rule 28 says its aero socks help you go faster by using rough, textured surfaces to generate a boundary layer of turbulent airflow around your leg. This reduces the size of the low pressure wake behind your leg and, in turn, lowers your aerodynamic drag.
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Rule 28, a UK-based manufacturer of aerodynamic clothing accessories, has released its latest aero sock. Boldly, it claims they are “the fastest aero socks in the world” and could save you over 12 watts versus a standard pair of cycling socks. The socks comprise a standard ankle sock sewn to an upper made of thin, textured Lycra, similar to what you might see on the sleeves of a fancy skinsuit. It’s this upper fabric that affects your aerodynamic drag because the lower part of the sock is obviously hidden by your cycling shoes while riding. The aero fabric isn’t quite as stretchy as you might expect though, so you do have to be careful putting them on (instructions are handily included) and there are internal silicone grippers to help them stay in place. Similar to dimples on a golf ball, most aero socks work by using rough, textured surfaces or pronounced, strategically placed seams to generate a boundary layer of turbulent airflow around your leg. This reduces the size of the low pressure wake behind your leg and, in turn, reduces your aerodynamic drag. Rule 28 claims this new sock also bests aero socks from leading competitors such as Nopinz, Castelli, Velotec, Kalas and Defeet. Simon Bromley / Immediate Media Simon Bromley / Immediate Media Simon Bromley / Immediate Media Simon Bromley / Immediate Media Simon Bromley / Immediate Media
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Read More »Though we’re admittedly not qualified aerodynamics experts by any stretch, standard industry practice for wind tunnel testing bike stuff has tended to be at fixed speed (usually around 45kph) and varying yaw angles in recent years. The obvious downside of that method of testing is that it leaves out the speed variable and Rule 28’s data makes it clear changing that can have a significant effect. Therefore, an ideal solution might be to test at varying speeds and varying yaw angles. In fairness to Rule 28, though, wind tunnel testing is still costly and being a small company it clearly doesn’t have unlimited resources. Digging into the data shows that there are naturally a few caveats, the principle being that the maximum 12.6 watts saving vs the standard baseline sock (which Rule 28 stated was a Morvelo Fluro sock) occurs at a speed of 60kph. That may be a speed only a select few are usually able to achieve on anything other than long descents, but there are still gains to be made at slightly lower speeds.
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Read More »At £24.99, they are undoubtedly expensive for a pair of socks, but this price is in line with aero socks from competitors. An argument might also be made that in terms of £/watts potentially saved, they actually represent good value compared to the expense of upgrading components such as wheels, frames or helmets. Readers of this website will no doubt be happy to know Rule 28 says the socks are fully compliant with UCI (Union Cycliste Internationale – the sports governing body) technical regulations. In a classically complex manner, Article 1.3.033 BIS dictates that socks “used in competition may not rise above the height defined by half the distance between the middle of the lateral malleolus and the middle of the fibula head”. Fortunately, for those who don’t know where their lateral malleolus or the middle of their fibula head are, the UCI provides a handy diagram in its regulations and has even developed a tool for checking sock height at UCI sanctioned events: Rule 28’s aero socks are available now from the Rule 28 website in UK sizes 3.5 to 12 and in white, black or with ‘calligraphy’ graphics.
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