Visma–Lease a Bike is testing new carbon-spoked Reserve wheels at the 2025 Tour de France.
The rims appear to be existing options updated with carbon spokes. These would be the first Reserve wheels to use carbon spokes.
We spotted 34 and 57mm deep front wheels, and a 64mm-deep rear wheel at the Visma-Lease a Bike team bus.
The 57/64 combination appears to be a new wheelset designed specifically for the updated S5, which we've also seen at this year's Grand Départ (look out for a gallery on that bike coming soon).

To fit the spokes, Cervélo’s sports marketing director Richard Keeskamp said Reserve – a sibling brand to Cervélo's owned by parent group, PON – worked with hubset specialists Tune, to develop custom hubs with a lightweight shell and ceramic bearings. The spokes attach to the rim via alloy nipples.

The design is similar to that seen on the Hunt 48 Limitless UD Carbon Spoke Disc and FFWD Raw 44 wheelsets.
Keeskamp confirmed to BikeRadar that the spokes are just as aerodynamic as their steel counterparts due to their bladed design.

We weren’t able to weigh the wheels, but Keeskamp confirmed the carbon spokes were chosen for their lighter weight relative to most steel spokes. Keeskamp also said the wheels provide a more lively ride sensation.
This tallies with our findings when testing similar wheels. Keeskamp said that the Visma pros that have tried the wheels enjoyed how they handled when climbing and descending.
Expect to see them raced in anger when the Tour hits the mountains, and Jonas Vingegaard and co. try to usurp pre-race favourite Tadej Pogačar.