Mini Chain Tool+ w/Valve Core Remover

A trailside chain failure is the worst kind. You're hours from a workshop, the rest of the ride is back to the car, and you need a chain tool that's actually in a jersey pocket. The Mini Chain Tool+ 1647/5MINI is what fits there. 53 grams, smaller than a tire lever in the long dimension, and it drives a chain pin the same way the workshop tools do.

What surprises most riders the first time they use it is that the small body actually works. The spindle threads are precise enough to push a pin straight, the chain support holds a chain plate against the driving pin, and the handle gives you enough leverage to crack a stiff rivet without slipping. It's not a workshop tool sized down; it's a small tool designed to do one job under conditions where any tool that doesn't is dead weight.

Compatibility

The Mini Chain Tool+ covers 5- through 11-speed derailleur chains. That's most of the chains a rider is likely to be on for a long ride: 11-speed road and MTB drivetrains, gravel groupsets in the 11-speed era, anything older with narrower or wider cog spacing back to 5-speed. For SRAM AXS flat-top chains or Campagnolo peening, you want the workshop tool back at the car; the Mini's geometry doesn't carry those inserts.

The valve-core remover detail

Open the handle and the inside surface doubles as a valve-core remover. It fits both Schrader and Presta cores; the same slot drives both. This is the second-tool problem that gets solved by carrying one tool: sealant top-up on a tubeless setup, valve-stem swap on a flat repair, presta-to-Schrader replacement on a loaner wheel. The valve-core function is right there, in the part of the handle that already has to be in your pocket.

Specs

• 5-11 speed derailleur chains
• 67 × 11 × 43 mm
• 53 g
• Pin diameter: 6.8 mm
• Valve-core remover for Schrader and Presta valves built into the handle
• Article number: 1647/5MINI

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The Mini Chain Tool+ is the chain tool most riders end up carrying because workshop chain tools don't fit a jersey pocket. The construction comes from the same Zreče workshop lineage as the bench tools, sized for a different use case.

Pro tip from our mechanics

Breaking a chain trailside is different from breaking one on a bench. You don't have a workstand, you can't shift to small-small because the chain is already broken, and the drivetrain is dirty. The break itself works the same way the workshop sequence does; what changes is the reinstall. If you're carrying a master-link spare (and you should be), that's the fast path back to riding. Our chain-replacement guide names which master links are reusable, which are one-and-done, and what a pin-pressed reinstall looks like when a master link isn't an option: When and how to replace your chain →