As for a sub 500g tyre…. why do you want one?
Because it's for a lightweight XC bike, were I'm trying to save weight, and as it's rotational weight on the very outer edge of the wheel, tyres are probably the most important place to save it.
Ah thanks for clearing that up stuartie_c. I think I'll give the tyres I have at the minute ago and if I can't get them to seal, give some tubeless ready ones ago.