Wolf Tooth MK0 Centerlock Rotor Lockring External Spline Lock it Down The MK0 line exists because Wolf Tooth believed their original lockring design still had weight to give up. Extra CNC machining time enabled a 35% reduction in weight compared to the original lockring design. The featherweight profile carries the MK0 design language: a spoked profile with visible machine paths that signal the extra lathe time each piece receives. The redesign happened with direct consultation from Team Visma Lease A Bike, so the engineering priorities behind it are serious. Each lockring is made from 7075-T6 aluminum and machined at Wolf Tooth in Minnesota. If you run a centerlock hub and want to trim grams from a part you never think about, this is where to start. 7075-T6 aluminum construction gives you the strength-to-weight ratio needed to hold a rotor securely under hard braking without the penalty of heavier alloys35% weight reduction over the standard Wolf Tooth lockring means real grams saved on a part you install and forget, with no sacrifice in clamping integrity External spline interface installs with a standard 44mm BB tool or the Wolf Tooth Pack Wrench, and torques to 40Nm for a secure, rattle-free hold Broad axle compatibility works with 12mm, 15mm, and 20mm thru axles as well as QR, covering nearly every centerlock hub on the market Standard 4mm Flange / 44mm OD matches the industry standard dimensions, making it compatible with all mountain bike frames and most road bike frames - verify clearance on tight road or gravel setups before ordering SPECIFICATIONSAxle Compatibility12mm, 15mm, and 20mm thru axles and QRTorque30Nm Install Tool44-16 BB tool or Wolf Tooth Pack Wrench Flange/Spline External Spline, 4mm flange, 44mm outer diameter (compatible with all mountain bike fork/frames and many road bike fork/frames)Weight6. 8g Material7075-T6 Aluminum with stainless steel shim washer | Wolf Tooth Components | Mk0 Centerlock Rotor Lockring External Spline Shadow Gray