Originally Posted by sospan
Spokes were "pinged" and all seemed ok, even the one where the tear is. Tyreis new with only 300 miles. No clues as to why it happened. Outside chance of a bump during new tyre fitting?
Time will tell.
Many thanks for taking the time to reply.... BTW, I have never run a car with spoked wheels, thus have no experience so related to share.. hopefully someone else might provide a suitable resolution..

Looking at the shape and sharp edges of the crack, it would seem that the sealer used was inflexible to some degree, and that perhaps another type of sealant might be more efective, perhaps from the boating world where sealant between the deck planks has to contend with both heat and cold and remains flexible...?
Just thinking in type... (-: