Pretty sure Spesh roubaix tyres are only 'Tubeless ready', rather than proper tubeless, so they dont have an airproof inner liner. Ergo, they need to use the sealant to seal the interior and sidewalls, so they will leak for a bit first time and you need to use more sealant than usual.
Wow, I never knew that distinction. It makes sense, as the other one I put in had some sealant already on it from a failed fitting previously and that particular one is holding. This is good to know, thank you.
Pretty sure Spesh roubaix tyres are only 'Tubeless ready', rather than proper tubeless, so they dont have an airproof inner liner. Ergo, they need to use the sealant to seal the interior and sidewalls, so they will leak for a bit first time and you need to use more sealant than usual.