For serious track bike riders, these MKS chain tugs are a game-changer. This set includes two NJS-certified prong end chain pulls, made in Japan with precision lost wax construction. They’re designed to keep your chain tension spot-on, with a patented adjuster system that’s both reliable and sleek. The dropout thickness is 5mm, and they fit hub spindles with a 10mm diameter. Plus, they’re NJS/Keirin approved – so you know they’re built to race standards. Installation is straightforward, and once they’re on, you’ll notice smoother gear shifts and better power transfer. Whether you’re building a fixie, upgrading your track bike, or just love quality components, these tugs deliver performance and style. Made with durability in mind, they withstand heavy use without slipping. A must-have for bike enthusiasts who care about细节 and authenticity. Ride with confidence – and with parts that are tried, tested, and tournament-ready.