PeteHski

This is a good point. With a “normal” puncture, the foam insert should allow the tyre to run flat for miles. That’s the whole point of the insert and why they are so widely used at races like Paris Roubaix. Some teams not using inserts at Roubaix last year got caught out by flat tyres coming off rims. One of the Ineos riders was discussing this in a post-race podcast and criticised teams who were not using inserts with their tubeless tyres. There were no comments about hooked vs hookless though.

But in this particular crash the insert clearly didn’t work, which suggests that the tyre came off suddenly without warning. Whether that was from a severe impact or a spontaneous tyre blow-off depends on whether you believe the manufacturers or take a more cynical view. An impact seems more likely given the reported rim damage.