You can use a zipp, HED, enve etc. These screw over the existing valve that you leave open.
Topeak do one that you carry with you and use to poke into the rim and open the valve as you screw it on. I hate these though.
I've got on with these...until it was discovered, too late, that they don't fit in the valve hole on my C40s.
@Smallfurry started
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You can use a zipp, HED, enve etc. These screw over the existing valve that you leave open.
Topeak do one that you carry with you and use to poke into the rim and open the valve as you screw it on. I hate these though.