Compatible with straight valve hole Hugo 52 rims and designed to fit 7.5 - 8.5mm valve holes. Sold as a pair. Identifying your Hugo rim and selecting the correct valve stem: Stepped Hugo rims have a larger diameter valve hole on the interior of the rim, and a narrower hole on outside of the rim. Quick tip: don't remove your tire if you don't have to. If your Hugo rim decal reads: MAX RIM PRESSURE: 2.8 tires: 26psi, 3.0 tires: 24psi ERD 615, 622x49.9, 29 in x 52.3mm Your rim has a stepped valve and is not compatible with this valve. For "Stepped" valve hole Hugo use part AS0105 - Valve Stem pair, Schrader, 32mm, 14mm base.