TOOPRE | TOOPRE Bicycle Derailleur Hanger Alignment Gauge Professional Tool Bike Hook Aligner Derailleur Bike 360° Rotation Repair Tools

Tail hook corrector*1Feature1. Premium Stainless Steel ConstructionCrafted from high-quality stainless steel with electroplating and heat treatment, this derailleur hanger alignment gauge delivers high hardness and outstanding corrosion resistance. The rhombus correction rod maintains stable structural strength under repeated correction operations, resisting deformation and wear. It is a long-lasting professional maintenance tool for bike workshops and cycling enthusiasts.2.  360° Rotation Correction DesignSupports full 360-degree rotary measurement and correction around the rotating shaft. You can accurately check the deviation between the derailleur tail hook and wheel rim from all angles, effectively fixing bent hangers. It solves common shifting troubles like inaccurate positioning, delayed gear changes and chain dropping caused by misaligned tail hooks for both road and mountain bikes.3.  Precision Adjustable Sliding BracketEquipped with movable sliding bracket and measuring rod, matched with positioning O-rings for convenient reading and marking. The plum blossom knob enables smooth locking and position adjustment, letting you flexibly set the distance between measuring rod and wheel hub. It helps you obtain accurate deviation data for precise tail hook calibration.4.  High-Precision CNC Thread MachiningAdopts CNC thread milling technology for tight and smooth thread fit. The M10 fixing screw and removable 5mm inner hexagon rotating rod work stably without jamming during tightening and positioning. The locking structure firmly secures the tail hook during correction, preventing shifting and guaranteeing reliable calibration results every time.5.  Complete Professional Bike Maintenance ToolComes with full set of accessories including measuring rod, O-rings and fixing screws. The whole kit weighs about 1062g, easy to carry and store. Suitable for daily bicycle repair and professional shop use, it helps riders avoid frequent replacement of damaged hangers and reduce maintenance costs efficiently.