Trek Hanger W322175

Trek Derailleur Hanger – W322175

The Trek W322175 is a genuine Trek rear derailleur hanger commonly used across a wide range of Trek hardtail mountain bikes and hybrid bikes with 135mm quick-release rear dropouts. At Mackay Cycles, this is the primary hanger we use and stock for Trek Marlin Gen 2 bikes.

Key details

• Trek part number: W322175
• Location: Rear derailleur hanger (drive-side)
• Dropout type: 135mm Quick Release (QR)
• Mounting: 2-bolt hanger
• Material: Alloy (designed to bend before frame damage)

Compatible Trek bike models

Mountain Bikes

• Trek Marlin Gen 2 (all models & sizes)
• Trek X-Caliber (2014–2017)
• Trek 4 Series Hardtail (2010–2014)
• Trek 8 Series Hardtail (2014)
• Trek 9 Series Carbon Hardtail (2009–2013)
• Trek Skye S / SL / SLX (2010–2016)
• Trek Cali (select years)
• Trek Mynx / Mynx S / Mynx SL
• Trek Ticket (selected non-thru-axle models)
• Trek Powerfly HT (QR rear versions)

Hybrid / Fitness Bikes

• Trek FX 7.2 / 7.3 / 7.4 / 7.5 / 7.6 / 7.7 (selected years)
• Trek Verve (QR rear models)
• Trek 9th District

Gary Fisher (Trek-era)

• Gary Fisher Ion
• Gary Fisher Mendota
• Gary Fisher Monona
• Gary Fisher Wingra
• Gary Fisher Road Crown Series

Important fitment notes

• Trek often uses different hangers between generations and axle standards. This hanger is for quick-release (QR) frames only — not thru-axle.
• If your bike is a Trek Marlin Gen 2, this is the correct hanger in the vast majority of cases.
• If you’re unsure, bring the bike or the old hanger into Mackay Cycles and we’ll confirm it for you.

Need help confirming compatibility or want one fitted by our workshop? Get in touch with the team at Mackay Cycles — we keep these hangers in stock.