Van Dijk’s Trek Speed ​​​​Concept adapted to the track

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Trek has unveiled the track-friendly speed concept that Ellen Van Dijk will ride in her bid to break the UCI hour record on Monday. Van Dijk is the current time trial world champion and will attempt “the hour” on a bike almost identical to the one she won the world title with last year. But the Hour requires a fixed-gear trail bike, which Trek doesn’t currently offer. So just as Factor had to adapt Alex Dowsett’s Hanzo frame for its attempt at the Hour last year, Trek had to get inventive with its road Speed ​​Concept.

A suitable framework

Earlier this week, Trek-Segafredo Team Support Manager Glen Leven explained to CyclingTips some of the work involved in converting a road time trial frame into a race-ready bike. the track hour record. Van Dijk’s track speed concept started life as a road spec speed concept, breaking out of the exact same mold that Trek uses for Van Dijk’s time trial rigs, before have the dropouts cut off. In their place, Trek glued in CNC-machined aluminum track-specific dropouts, with a horizontal rear dropout making a fixed-gear and adjustable-ready bike to accommodate different gear ratios.

Van Dijk having only decided to make this attempt at the end of December 2021, Trek only had three months to modify, convert and test the trail bike by April in order to give Van Dijk the opportunity to start. his training before the attempt.

building

Van Dijk will ride in an identical position to his road time trial setup, but still the demands of staying powered up for a full hour, with g-forces in the corners and no possibility of coasting or s ‘sit mean time will always be a huge challenge for the body. To achieve this identical position, Trek created what Leven calls a “semi-custom” set of aero extensions. Such custom aero extensions are now almost the norm, but it was the hour record and Victor Campenaerts who played a key role in starting the trend for custom extensions when the Belgian won his hour record in 2019. Trek’s aero extensions are said to be “available”. but expect long delays.

wheels

Van Dijk’s disc wheels might look familiar. The track-specific discs are from Zipp and feature a very similar design to the wheels Jens Voigt used to break the hour record in 2014. Pirelli was on hand to supply Van Dijk’s team with prototypes 23 mm track tires. Perhaps surprisingly on the super soft track, Van Dijk plans to line up for the attempt with 8 bar / 116 psi of pressure in his tubs.

Transmission

Of course, to break Joss Lowden’s current record of 48.405 km, Van Dijk will need great legs, everything to go well in the day and much more, in addition to these aero extensions. As for the gears, Leven tells us that Van Dijk prefers a cadence somewhere in the 93-97 rpm range and the team worked with SRAM to get a Quarq 58t power meter chainring up front. mated to a 14-tooth rear sprocket.

Interestingly, Trek-Segafredo colleague Leven and Koen de Kort opted for a SRAM XX1 1x chain, explaining that the mountain bike chain tested as the most efficient and also works well with the single-speed drivetrain. Hidden in the hubs, Van Dijk will have ceramic bearings from Kogel and between the cranks, SRAM has a ceramic bottom bracket for every last marginal gain.

Case

Van Dijk will use a Santini jumpsuit with a unique design to mark the occasion. The suit, in addition to the Giro Aerohead TT helmet, is said to be identical to Van Dijk’s Team Edition kits for the road, but that doesn’t mean no shortcuts have been taken. Van Dijk went straight from the Amstel Gold Race to the wind tunnel in Magny Cours, France, to test her stance, clothes, helmet and the new bike in a complete package. Leven explains that although his stance is identical and Van Dijk has tested his stance against the clock several times before in the wind tunnel, all of those tests were done at a series of yaw angles. The specific test for the hour record in April was specifically at zero yaw in line with the yaw angles encountered on the track.

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