TOOPRE Derailleur Hanger Alignment Gauge Feature: Used to correct rear derailleur lugs have solved many transmission shifting problems, especially positioning rear derailleur systems. Features: stainless steel body, electroplated heat treatment, high strength, corrosion resistance, 360° rotating correction, CNC turning and milling threads, tight fit, plum rotating handle, easy adjustment of the measuring rod. Made of stainless steel, electroplating heat treatment, high hardness and corrosion resistance. Precision thread, tight fit, clockwise rotation of the positioning knob, screw the bolt into the rear change lugs to lock. Lock and press the sliding bracket to adjust the distance between the measuring rod and the hub, and measure the deviation between the tail hook and the wheel rim. Take the swivel rod as the axis and rotate 360° to measure the distance between the wheel rim and the tail hook and correct the tail hook. Positioning O-ring: move the measuring rod to touch the wheel rim, and position the O-ring by pressing the sliding bracket flush while moving the O-ring. Specification: Name: Bike Tail Hook Corrector Color: Silver White Material: Stainless Steel Weight: About 1062g / Box Package Size: 430*100*70mm/16.93*3.94*2.76in Function: used to correct the rear shift lugs have solved many transmission shifting problems, especially positioning the rear shifting system. Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. This is an indispensable shop tool that can be used to both measure and straighten misaligned derailleur hangers solving a high percentage of shifting problems. Simple to use The Derailleur Hanger Alignment Gauge can help solve a multitude of derailleur shifting problems, most notably with index shifting systems. This tool is extremely steady in operation. The tool threads directly into the derailleur hanger. The gauge bar holds a gauge which marks the distance to the wheel. The gauge then is rotated with the wheel to the 3, 6, 9, and 12 o'clock positions, noting any differences in measurements. The alignment of the derailleur hanger is accomplished by applying pressure to the tool's arm. The results can be checked instantly. Gauge bar made of heavy gauge, chrome plated steel Adjusts to fit 20" to 29"+ wheels Replaceable threaded tip Upgraded large inner shaft for added strength Tighter tolerances for improved accuracy Improved clearance and reach to fit more frame/hanger combos including low clearance thru-axle derailleur hangers

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