The Hanger Genie 2.0 screws directly onto the threads of your rear derailleur hanger and features a precision gauge that locks into place, ensuring you don't lose your measurement as you adjust the tool against the wheel in various positions. The swivel bottom of the tool makes it easy to get around the frame, making it an essential tool for any bike maintenance kit.Features:- Compact, foldable, and highly accurate tool.- Fits bikes with most common wheel sizes including 26´´, 27.5´´/650B, and 29´´/700- Swivel bottom for easy cleaning of frame and accessories, allowing you to seamlessly work around the wheel- Lockable gauge securely locks measurements in place to maintain accuracy while repositioning- Extended threaded shaft provides additional clearance, perfect for full suspension frames- Sealed bearing ensures smooth threaded shaft operation and long gauge life- Convenient gauge storage clips keep your measuring gauge conveniently stored and protected.