Valve Core Tool

The valve core is the cheap part that turns a slow leak into a hunt. If the tyre holds air with the valve pointed up and then weeps once you ride, the core seal is usually tired, dirty, or gummed. Unior's 1755/2 is the bench tool that turns that core out and seats a new one.

Official copy is short. The 1755/2 installs and removes Schrader and Presta valve cores. The official cut-out stamps PRESTA on the left socket and SCHRADER on the right, so one bar covers both valve types you see on a shop floor. Unior says it is precisely made from tool steel, and hexagonal so you can hold it. That is the published feature set. We do not name a steel grade Unior does not name, and we do not print a length Unior does not print.

A tubeless Presta valve still takes a Presta core. Pull the core before you pour sealant down the stem, then seat the core again. Sealant through a core that is still in the valve is how a new install starts leaking the next morning.

Compatibility

• Presta valve cores
• Schrader valve cores
• Tubeless valves that use a Presta or Schrader core
• Not a pack of spare cores. We do not sell loose cores on this site.

Specs

• Article 1755/2, code 628912
• Official name: Valve core remover
• Material: tool steel (Unior's wording)
• Shape: hexagonal, published for grip
• Ends: PRESTA socket and SCHRADER socket, stamped on the official cut-out
• Weight: 39 g
• Official page carries Unior's lifetime-warranty and trivalent-chrome (Cr3+) profile badges
• Spare-parts list on the official page is empty

All listed dimensions are in millimetres and may vary in tolerance. Weight is in grams. Unior's drawing labels L, L1, D1, D2, D3 and D4; the official table does not print those numbers, so we do not either.

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 1755/2 is a small hex bar with two stamped sockets, and that is the point: the official spec is tool steel and a hold you can actually use. We also stock the Valve Core Tool / Handle 1700VH, a smaller piece that rides with a Unior multitool. That listing is a different article, not a spare for this one.

Pro tip from our mechanics

A slow leak that is not a puncture is usually the core. On tubeless wheels it is usually a core that sat in the stem while sealant went in. Pull the core with the 1755/2 first, add sealant through the open valve, then reseat the core. The rest of that sequence, plus bead work, is in How to remove and install a bike tire →.

FAQ

Does the 1755/2 work on both Presta and Schrader? Yes. Unior's official copy says the 1755/2 installs and removes Schrader and Presta valve cores. The official cut-out stamps PRESTA on one end and SCHRADER on the other, so one tool covers both.

Will it turn a tubeless valve core? Unior names Presta and Schrader cores, not a separate tubeless standard. A tubeless Presta valve still uses a Presta core, so the PRESTA end is the one that fits. We do not sell replacement cores on this site.

What is the 1755/2 made of? Unior's published wording is tool steel, hexagonal for grip. The official page also carries lifetime-warranty and trivalent-chrome (Cr3+) badges. Unior does not publish a steel grade beyond tool steel.

What are the official dimensions? The official table publishes weight only: 39 g. The official drawing labels L, L1, D1, D2, D3 and D4, but Unior does not print those millimetre values. Article 1755/2, code 628912.