Why is Jonas Vingegaard using tiny 150mm cranks?
Briefly

Jonas Vingegaard, two-time Tour de France champion, is adopting 150mm crank lengths, potentially as a competitive response to Tadej Pogačar's switch to 165mm cranks. Visma-Lease a Bike is also transitioning several riders, including Wout van Aero, to shorter cranks, which may enhance cadence and aerodynamics. Vingegaard's stature at 175cm makes shorter cranks advantageous for him compared to taller teammates. Custom Sram Rival cranks were spotted on his bike, indicative of a trend towards optimizing equipment for performance gains in cycling.
If you're going for a custom set of cranks, why not just get a set of Red cranks made? Well, that comes down to the cost of production.
Vingegaard has swapped his Sram Red crank arms out for debadged Sram Rival ones, still mated to the Red chainrings.
Vingegaard is perhaps the most prominent because he is the team's key rider for the Tour de France.
Reports indicate Wout van Aero is down to 160 or 165mm, showing a trend in the team towards shorter crank lengths.
Read at cyclingnews.com
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