All Wheels Manufacturing replacement derailleur hangers are produced in our Colorado shop to exacting tolerances.

• CNC machined 6061 aluminum
• Black anodized finish
• Attaches to frame with (2) M4x4 Socket Head Screws
• Replaces:
• Trek part #W303978
• Trek part #W295979
• Frame Compatibility

Notes:

• This hanger has 4mm threaded fastener holes in it. DROPOUT-164 is the same hanger, but with 3mm threaded holes.
• Trek part #W295979 is thicker where the fastener holes are, but DROPOUT-158 will work.