What Torx Sizes Does the TWS-3 Cover?

The Park Tool TWS-3 is a 3-way Torx compatible wrench covering T25, T30, and T40, the three Torx sizes most commonly found on modern bicycle components including disc brake rotors, stem bolts, and suspension hardware. The 3-way handle design gives you a different grip for each size, so the tool is always oriented for comfortable torque rather than requiring you to flip or reposition it mid-fastener. Built from heat-treated steel, the TWS-3 engages Torx fasteners cleanly without the cam-out and rounding risk that comes from using undersized drivers.

As disc brakes and precision components have become standard across road, gravel, and mountain bikes, Torx fasteners have followed. The TWS-3 covers the three sizes that show up most in real-world bike service, making it a practical addition to any toolkit that works on modern bikes.