H51: derailleur gear hanger, Trek Part #W990116, Gary Fisher # W290842, the same Pilo D193, dropout for bike frames

H51 Alloy Rear Derailleur Hanger.

Known to fit at least the following brands (not exhaustive):

• Gary Fisher
  Gary Fisher Ion CX 2013
  Gary Fisher Road - 2009
• LeMond
  LeMond Chambery 2007
  LeMond AC/DC - 2006
  LeMond Aeroluminum - 2001
  LeMond Aeroluminum - 1998-1999
  LeMond Aluminum - 2006
  LeMond Dual Zone (triathlon) - 2006-2007
• Trek
  Trek 1.2 2008
  Trek 1.5 2008-13
  Trek 1200 Road 2002-03
  Trek 2 Series Road 2008-13
  Trek 2 series 2008-12
  Trek 2.1 Apex 2012
  Trek 2.1 2012
  Trek 2.3 2012
  Trek 2000 Road 2002-05
  Trek 2200 Road 2002-05
  Trek 2300 Road 2002-05
  Trek 3rd Dimension Road 2004-08
  Trek 7.7 FX 2013
  Trek Aluminum Road 2001-11
  Trek Cross 2001-11
  Trek Equinox 5 2006-08
  Trek Equinox 7 2004-08
  Trek Equinox 9 2004-08
  Trek F400 Folding 2004-07
  Trek F600 Folding 2004-07
  Trek Fisher Ion CX 2013
  Trek Fisher Rail 2010
  Trek FX WSD 2012
  Trek FX 2012
  Trek Hilo 1000 2001-02
  Trek Hilo 2000 2001-02
  Trek Ion CX 2012-13
  Trek Lexa Series 2012-13
  Trek Madone 3 Series 2011-13
  Trek Madone 4 Series 2009-11
  Trek Madone 5 Series 2009-10
  Trek Madone 6 Series 2009
  Trek Pilot aluminum 2005-08
  Trek Pilot Series 2008-10
  Trek XO 2008
  Trek XO1 2001-12
  Trek XO2 2008-12

Number of fasteners: 1
The necessary screw M6 Chainring Bolt
Mounting on frame:     Outer
Axle diameter:     10mm (Standard QR)
Material:     aluminium
Color:  Silver
Derailleur mount type:     Standard mount

Equivalent To :
Gary Fisher Aka # W290842
Lemond Aka # 284383
Trek Aka #W990116
Pilo D193
Derailleur Hanger #249
Marwi GH-137