When I was assistantspannering for the Danish track team in Manchester this Feb, I was surprised to be told not to fit lockrings, even for wheels to be used by the pursuit team. This was purely to save time as gearchanges were announced with sometimes few minutes notice.
But if it's for tarmac then I'd fit one if I were you.
But if it's for tarmac then I'd fit one if I were you.