Uncle Mort said:I don't think it's a should thing, it's just they're not needed; according to Sheldon:
Separate valve caps are not needed with Presta valves. The caps that come with Presta tubes and tubulars are there so that the pointy end of the valve won't puncture your spare tube or tubular while it is rolled up. There's no reason to use them in actual riding
John the Monkey said:I like the conti yellow ones that come with my tubes.
threebikesmcginty said:That's the reason I use them too - what better reason than they look nice!
Perhaps my tyres are thinner than yours or my tubes more gas-permeable, but I can't usually survive more than a couple of weeks without needing to put some air in them. Never yet had a problem with stuck nuts, or at least not in that contextJonathan M said:If you can survive a couple of months without a p**c**e and ride without caps, there is a chance that the little nut on the end of a presta valve might have corroded stuck.
coruskate said:Perhaps my tyres are thinner than yours or my tubes more gas-permeable, but I can't usually survive more than a couple of weeks without needing to put some air in them. Never yet had a problem with stuck nuts, or at least not in that context