The BURD CX was a cyclocross specific rear derailleur 'designed' in muddy ol' Portland, Oregon. The design process involved starting with a respectable microSHIFT derailleur, upgrading its pulley wheels (there was ) and increasing the tension on the p-pivot spring.

Because cyclocross is hard on parts, it was very important to the designers that the resulting derailleur should be inexpensive, and they even went so far as to promise to rebuild any derailleurs for $34.

Just for your information, BURD stands for 'Blatantly Upgraded Rebranded Derailleur' and CX stands for Cyclocross.

The BURD CX has been through a number of generations:

• It started life, in 2013, as the Retroshift BURD CX, a 10-speed derailleur supplied with a choice of either Shimano Ultegra or FSA units with ceramic bearings.
• In 2014, Retroshift was rechristened as 'Gevenalle'. This was simply a change of brand name.
• Possibly in 2017, Gevenalle make two changes. Firstly they introduced an 11-speed version of the BURD CX. Secondly they offered both 10 and 11-speed version with an additional choice of pulley wheels - adding a top-end Kogel CX, CNC machined, sealed bearing option.

Whatever the variant, it's a likeable piece.

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This particular, slightly dull, but completely perfect, example is:

• Branded Gevenalle.
• 11 speed.
• Fitted with FSA pulley wheels with ceramic bearings.

I quite like the use of contrasting polished and stipled surfaces. Very architect-designed, but the stipling is also quite good for shedding mud.

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• Derailleur brands: Gevenalle, manufactured by microSHIFT
• Country: USA, manufactured in Taiwan
• Date of introduction: 2017?
• Date of this example: unknown
• Model no.: CXDR11FS
• Weight: 199g
• Maximum cog: 28 teeth with a double cxhainring or 32 teeth with a single chainring (source: Gevenalle)
• Total capacity: 33 teeth (source: Gevenalle)
• Pulley centre to centre: 59mm
• Index compatibility: 11 speed Shimano compatible
• Chain width: 3/32”
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: Aluminium, commendably with no major steel parts