Wout van Aert is testing a time trial bike with two disc wheels ahead of the Paris 2024 Olympic time trial.While its common for time trialists to run a single disc wheel on the back of their time trial bike, paired with a deep-rimmed front wheel, its rare for a rider to use a double-disc setup.A typical time trial setup a disc rear wheel and a deep-rimmed front wheel enables riders to take advantage of the significantly improved aerodynamics of a rear disc, without it having a disproportionately adverse impact on the bikes handling.Track pursuit riders regularly use two disc wheels, but its much less common for road riders to run a double-disc setup in a time trial. Choosing the most aerodynamic wheel at the front of the bike (i.e. a disc) wont necessarily be the fastest option if you cant control the bike in the wind.Why choose two disc wheels?A rider using two disc wheels on a time trial bike is a rare sight. - IMAGO / Photo NewsWout van Aert must be confident in or at least intrigued by the potential benefits of a double-disc-wheel setup for this Saturday's Olympic time trial.Shara Marche used a double disc at London 2012, although the Aussie finished in 13th place, 2:15 behind the winner.The Paris 2024 Olympic time trial course starts in Les Invalides in the 7th arrondissement of Paris before heading east to Fontenay-sous-Bois and back to its starting point via Place de la Bastille.The 32.4km course is flat with long straights and only 150m of ascent. Wout van Aert may think that, with few turns and little climbing, there will be little disadvantage to running two disc wheels. If thats the case, the extra weight and the compromised manoeuvrability of his Cervlo P5 time trial bike shouldnt be a penalty.Wout van Aert has also been testing the Paris course using a deep-rimmed front wheel. - Dirk Waem / Getty ImagesVan Aert may have also considered the weather, which is forecast to be still on Saturday, meaning he doesnt have to worry about the front disc wheel being blown around in the wind.But this is only a training session. Van Aert has also been testing a more conventional deep-section front wheel on the Paris Olympics time trial course and may opt for this setup on race day.More aero tweaksWout van Aert using the Giro Aerohead 2.0 helmet. - Dirk Waem / Getty ImagesBeyond the two-disc wheels, Van Aert appears to be considering several other drag-reducing kit choices to improve his chances of standing on the top step of the podium.Hes been out testing the course wearing the Giro Aerohead 2.0 helmet, which was revealed earlier this year at Tirreno-Adriatico.The Aerohead 2.0 follows the trend for time trial helmets growing steadily in size. The helmets wide wings presumably shift air from the leading edge of the helmet and around the shoulder.The most striking aspect of the helmet, however, is its length. It extends far beyond the riders forehead to create a cone-like profile.Van Aert has also switched to lace-up shoes in testing. - Dirk Waem / Getty ImagesThe Belgians Paris time trial bike also has a 1x drivetrain with a huge front chainring. Forgoing a front derailleur can reduce drag and Van Aert wont need the gear range of a 2x setup on the flat course.Van Aert, who finished sixth in the Tokyo 2020 Olympic time trial and claimed silver in the mens road race, is wearing lace-up shoes from his team sponsor Nimbi in testing.Laced cycling shoes may seem to be lower-tech than those with wrap-around uppers and Boa dials, but they could offer Van Aert a further advantage.The low profile of laced shoes is purported to be more aerodynamic than cycling shoes with Boa dials that protrude upwards into the air.This isnt the first time Van Aert has switched to lace-up shoes for a time trial he opted for lace-up shoes for the closing time trial of the 2024 Tour de France.