Derailleur (English Wikipedia)

"Review: Shimano Deore XT MTB Component Group". Bike198. Jan 19, 2010. Retrieved 2011-08-29. Install and setup is the same as any other Shimano shifting system with their 2:1 pull ratio.

bikemag.com

"TESTED: SRAM X-9 Shifters and Derailleur". Bike Magazine. January 19, 2006. Retrieved 2011-08-13. Shimano, by contrast, utilizes a 2:1 ratio where the rear derailleur moves twice as far as the cable pull for every click on the shifter.

campyonly.com

Norris, Eric (2010). "Campagnolo Cambio Corsa shifter". Campy Only!. Retrieved 1 June 2010.

classiclightweights.co.uk

Stone, Hilary (2007). "Super Champion Osgear". Classic Lightweights. UK. Archived from the original on 17 April 2012. Retrieved 1 June 2010. This site is all about rear derailleur gears...

competitor.com

velonews.competitor.com

Lennard Zinn (Apr 10, 2006). "Tech Talk: Mr. Zinn rides SRAM's new road groups". VeloNews. Archived from the original on 2012-07-06. Retrieved 2011-08-13. Both [road] derailleurs get "SRAM Exact Actuation," which is not quite the one-to-one actuation ratio of SRAM mountain derailleurs, so Force and Rival shifters are not compatible with SRAM X.0 rear derailleurs.
Lennard Zinn (Mar 17, 2008). "Can you run Campy shifters with a SRAM drivetrain? Sure, why not?". VeloNews. Archived from the original on 2011-08-30. Retrieved 2011-08-29. For a simple solution involving an adaptor that you can by [sic] and install easily, you can use a Jtek ShiftMate.
Zack Vestal (Apr 14, 2009). "Born for Beijing, the K-Edge chain catcher goes into production". VeloNews. Archived from the original on 2010-07-23. Retrieved 2010-07-12.

cyclinguk.org

"Cycling UK: A guide to rear shifting". Retrieved 2018-12-29.

cyclingweekly.com

Simon Smythe (May 21, 2018). "Do you need a clutch rear deraileur?". Cycling Weekly. Retrieved 2018-10-22.

gizmag.com

Best, Paul (2009-04-08). "Shimano's Dura-Ace Di2 electronic shifting to give road racers a time advantage". Gizmag. Retrieved 2010-02-10.

globalnet.co.uk

users.globalnet.co.uk

Berto, Frank. "Sunset for SunTour". Archived from the original on 2008-12-05. Retrieved 2007-03-17.

ihpva.org

"The mechanical efficiency of bicycle derailleur and hub-gear transmissions" (PDF). 2001. Archived (PDF) from the original on 25 July 2011. Retrieved 2011-07-18.

merriam-webster.com

"derailer: The word you've entered isn't in the dictionary". Merriam-Webster. Retrieved 2013-02-02.

oed.com

Oxford English Dictionary (2nd ed.). 1989. derailleur, n. A bicycle gear in which the ratio is changed by switching the line of the chain (while pedalling) so that it jumps to a different sprocket on the rear wheel. Also derailleur gear.

rotorbike.com

Rotor 1x13

sheldonbrown.com

Sheldon Brown (Nov 29, 2011). "Derailer, Not Derailleur!". Retrieved 2013-02-02. The word "derailer" (or "dérailleur") is actually a metaphor, relating the gear change to what happens when a railroad train goes off the tracks. In English, this is called a "derailment," not a "déraillement."
"Sheldon Brown's Glossary:Pulley". Retrieved 2009-09-26.
"Low-normal/High-normal". Retrieved 2010-12-21.
John Allen. "Mixing Brands and Models of Shifters, Rear Derailers and Cassettes". Sheldon Brown. Retrieved 2011-08-13.
Brown, Sheldon. "Chain Deflector". Sheldon Brown (bicycle mechanic). Retrieved 2010-09-06. In some triple-chainring installations, typically when the "granny" gear is unusually small, it may be impossible to get good shifting to the "granny" chainring with the normal derailer adjustments.

shimano-eu.com

cycle.shimano-eu.com

"Shimano FAQs: What is a "Top normal" or a "Low normal" Rear Derailleur?". Archived from the original on 2008-06-02. Retrieved 2008-02-28.

sram.com

"Exact Actuation". SRAM Corporation. Archived from the original on 2011-08-23. Retrieved 2011-08-13. When we launched our road technology from scratch we reapplied our MTB proven SRAM 1:1 actuation ratio (shifter cable travel : derailleur movement) for 10 speed rear shifting.
"SRAM MRX". SRAM Corporation. Archived from the original on 2011-09-29. Retrieved 2011-08-13.

thedancingchain.com

Berto, Frank J. (2005) [2000]. The Dancing Chain: History and Development of the Derailleur Bicycle (2nd ? ed.). San Francisco, CA, USA: Cycle Publishing/Van der Plas Publications. pp. 58–61.
Berto, Frank J. (2005) [2000]. The Dancing Chain: History and Development of the Derailleur Bicycle (2nd ? ed.). San Francisco, CA, USA: Cycle Publishing/Van der Plas Publications. p. 162.
Berto, Frank J. (2005) [2000]. The Dancing Chain: History and Development of the Derailleur Bicycle (2nd ? ed.). San Francisco, CA, USA: Cycle Publishing/Van der Plas Publications. p. 286.

web.archive.org

Stone, Hilary (2007). "Super Champion Osgear". Classic Lightweights. UK. Archived from the original on 17 April 2012. Retrieved 1 June 2010. This site is all about rear derailleur gears...
Berto, Frank. "Sunset for SunTour". Archived from the original on 2008-12-05. Retrieved 2007-03-17.
"Shimano FAQs: What is a "Top normal" or a "Low normal" Rear Derailleur?". Archived from the original on 2008-06-02. Retrieved 2008-02-28.
"Exact Actuation". SRAM Corporation. Archived from the original on 2011-08-23. Retrieved 2011-08-13. When we launched our road technology from scratch we reapplied our MTB proven SRAM 1:1 actuation ratio (shifter cable travel : derailleur movement) for 10 speed rear shifting.
Lennard Zinn (Apr 10, 2006). "Tech Talk: Mr. Zinn rides SRAM's new road groups". VeloNews. Archived from the original on 2012-07-06. Retrieved 2011-08-13. Both [road] derailleurs get "SRAM Exact Actuation," which is not quite the one-to-one actuation ratio of SRAM mountain derailleurs, so Force and Rival shifters are not compatible with SRAM X.0 rear derailleurs.
"SRAM MRX". SRAM Corporation. Archived from the original on 2011-09-29. Retrieved 2011-08-13.
Lennard Zinn (Mar 17, 2008). "Can you run Campy shifters with a SRAM drivetrain? Sure, why not?". VeloNews. Archived from the original on 2011-08-30. Retrieved 2011-08-29. For a simple solution involving an adaptor that you can by [sic] and install easily, you can use a Jtek ShiftMate.
"Third Eye Chain Watcher". Bicycling Magazine. Oct 2007. Archived from the original on 2009-06-08. Retrieved 2010-07-12.
Zack Vestal (Apr 14, 2009). "Born for Beijing, the K-Edge chain catcher goes into production". VeloNews. Archived from the original on 2010-07-23. Retrieved 2010-07-12.
"The mechanical efficiency of bicycle derailleur and hub-gear transmissions" (PDF). 2001. Archived (PDF) from the original on 25 July 2011. Retrieved 2011-07-18.