My dad loved the XAS and used them extensively on his many Daimler SP250’s his first being in 1964.
as a PR man he was involved in their launch to the uk market in 1965 (iirc) I think part of this was a journalist/ supplier track day I think at brands.
it was a cold frosty day and the Michelin management were concerned that this would affect the road test reports. And knowing dad had raced cars asked him to check out the track conditions . He said he “negotiated” a set of xas for his sp250 and went on track to defrost the racing line for a great number of laps which had people queuing