Derailleur Hanger 164, Trek Part Number #W311356, #W311356 PLEASE NOTE: Hanger 158 and Hanger 164 have the same geometry. However, Hanger 158 has 4mm threaded fastener holes, whereas Hanger 164 has 3mm threaded fastener holes. This hanger has 3mm threaded fastener holes in it. DROPOUT-158 is the same hanger, but with 4mm threaded holes. Trek part #W311356 is thicker where the fastener holes are, but DROPOUT-164 will work. Equivalent To Trek Part Number 9894-4206 Please See Known Compatibility List Below Fits Specific Bicycle Frames FIT based on Bicycle Brand, Model Name and Year of Production Derailleur Hanger Bolts Included M4x0.7 Socket Hex Head Screws Black Free Shipping Brand New in Package Always check the photo of the hanger we recommend against your hanger. If it does not look correct, it will not fit. Forest Byke Company does not have a complete database of every single frame and derailleur hanger combination ever produced. Hanger compatibility is the result of our own research, feedback from our customers and information that manufacturers have provided with us. Our database is constantly being updated with both new and old bike frames Known Compatibility List: Trek Trek: 6-series Madone: 2010-11 Trek: Cronus CX Pro: 2012-13 Trek: Cronus CX Ultimate: 2012-13 Trek: Cronus CX: 2014 Trek: Custom Madone 6 Series SSL: 2012 Trek: Custom Madone 6 Series WSD: 2012 Trek: Custom Madone 6 Series: 2012 Trek: Custom Speed Concept 9 Series WSD: 2012 Trek: Custom Speed Concept 9 Series:2012 Trek: Fisher Cronus CS: 2011-13 Trek: Fisher Cronus CX: 2011-13 Trek: Madone 4.5 WSD: 2012-13 Trek: Madone 4.5: 2012-13 Trek: Madone 4.6 WSD: 2012-13 Trek: Madone 4.6: 2012-13 Trek: Madone 4.7: 2012-13 Trek: Madone 5.2 WSD: 2012 Trek: Madone 5.2: 2012 Trek: Madone 5.5: 2012 Trek: Madone 5.9 Frameset: 2012 Trek: Madone 6.2 WSD: 2012 Trek: Madone 6.2: 2012 Trek: Madone 6.5 Frameset: 2012 Trek: Madone 6.5 WSD: 2012 Trek: Madone 6.5: 2012 Trek: Madone 6.7 SSL WSD: 2012 Trek: Madone 6.7 SSL: 2012 Trek: Madone 6.9 SSL Spartacus: 2012 Trek: Madone 6.9 SSL: 2012 Trek: Radioshack Nissan Trek: 2012 Trek: Spartacus Edition: 2012-13 Trek: Speed Concept 2 series: 2012-13 Trek: Speed Concept 2.5 WSD: 2012-13 Trek: Speed Concept 2.5: 2012-13 Trek: Speed Concept 7 series: 2012-13 Trek: Speed Concept 7.0 WSD: 2012-13 Trek: Speed Concept 7.0: 2012-13 Trek: Speed Concept 7.2: 2012-13 Trek: Speed Concept 7.5: 2012-13 Trek: Speed Concept 7.8 WSD: 2012-13 Trek: Speed Concept 7.8: 2012-13 Trek: Speed Concept 9 series: 2012-13 Trek: Speed Concept 9.5 WSD: 2012-13 Trek: Speed Concept 9.5: 2012-13 Trek: Speed Concept 9.8 WSD: 2012-13 Trek: Speed Concept 9.8: 2012-13 Trek: Speed Concept 9.9: 2012-13 Trek: TREK Edition: 2012-13