Bold statement: Cadex says the wheel failure at Omloop het Nieuwsblad wasn’t caused by hookless rims, but by extended, rough riding on cobbles after a puncture. But here's where it gets controversial: the chain of events they describe hinges on a sequence that starts with a deflation and ends with a structural rim crack that unseats the tire. Let’s walk through the details clearly and accessibly.
Cadex – the Giant-owned brand that has long produced hookless rims – released a formal statement addressing Amaury Capiot’s wheel-tyre system failure during Omloop het Nieuwsblad. Cadex asserts that the ultimate failure arose from prolonged riding over cobblestones with a flat and damaged rear Cadex Aero Cotton tyre, after the initial deflation had already occurred. In their view, this sustained stress caused the rim to crack, which then led to the spokes displacing from the hub and the wheel collapsing, culminating in the tire completely unseating from the rim.
Context on the tyre liner: images from the incident show a tyre liner still in place around the Cadex Ultra 50 rim. Tyre liners (foam or similar inserts) are common in tubeless setups, especially for cobbled classics. They’re intended to offer a run-flat capability and some rim protection if a puncture occurs. Capiot’s team apparently relied on this protection, with Cadex noting that the team support car was far behind. Still, the liner did not prevent the rim failure in this case.
Important caveat from the manufacturer: Cadex points out that neither Giant nor Cadex recommends using tyre liners with their rims and tires, and in this incident the Jayco-AlUla team was operating outside those guidelines. The company emphasizes that the liner was not identified as a contributing factor to the failure.
Event timeline and outcomes: Cadex states the initial impact happened at roughly 47–48 km/h. After that moment, Capiot continued to ride the cobbled sections until the wheel ultimately collapsed. The manufacturer notes that, even at the moment of failure, the wheel remained stable enough to avoid a crash.
Broader takeaways and questions for readers: this incident highlights the complexity of modern wheel systems under extreme conditions. It raises questions about when and how components like tyre liners should be used, and whether operating outside recommended guidelines can create unacceptable risk. Do you think manufacturers should be more explicit about acceptable practices for high-stress events like cobbled classics, or is rider judgment and team strategy enough to navigate these situations? Share your views in the comments.
