Bicycle gearing (English Wikipedia)

Ed Pavelka (1999). Bicycling magazine's training techniques for cyclists: greater power, faster. Rodale, Inc. pp. 4–5. ISBN 9781579541682. There are lots of cyclists who have suffered debilitating trauma from pushing too big a gear....benefits of spinning begin to disappear above 100 rpm.

ctc.org.uk

"Cyclists Touring Club: internal gear ratios". Archived from the original on 2 July 2011. Retrieved 29 June 2011.

frii.com

users.frii.com

"Bicycle efficiency and power -- or, why bikes have gears". Retrieved 20 July 2011.

gear-calculator.com

Dirk Feeken. "gear calculator".

hubstripping.wordpress.com

"Internal Gear Hub Review". Archived from the original on 18 July 2011. Retrieved 20 July 2011.

hupi.org

"Efficiency Measurements of Bicycle Transmissions" (Archived 14 November 2012 at the Wayback Machine) Bernhard Rohloff and Peter Greb (translated by Thomas Siemann) 2004. Rohloff's testing "at 400 watts, double what we did and found efficiencies approaching 98%".
"Efficiency Measurements of Bicycle Transmissions" (Archived 14 November 2012 at the Wayback Machine) Bernhard Rohloff and Peter Greb (translated by Thomas Siemann) 2004. "In our article we therefore concluded that hub gears are about 2% less efficient that derailleur transmissions under typical field conditions. We see no reason to change that conclusion."

ihpva.org

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

kenkifer.com

"Cycling Cadence and Bicycle Gearing". Archived from the original on 4 February 2012. Retrieved 18 July 2011.

mgagnon.net

Michel Gagnon (15 August 2010). "Installing 4 Chainrings To Climb Almost Anything Without Difficulty". Retrieved 15 March 2018.

pinion.eu

"Pinion P1.18". Pinion GmbH.

pinkbike.com

Mike Levy (30 August 2011). "Pinion 18 speed Gearbox - Eurobike 2011". PinkBike.com. Retrieved 12 September 2011.

rohloff.de

"What Kind Of Drive The Cyclist Needs". Archived from the original on 3 July 2011. Retrieved 20 July 2011.
"Efficiency measurement of bicycle transmission". Archived from the original on 29 September 2011. Retrieved 22 July 2011.

sheldonbrown.com

"Gear Theory for Bicyclists". Archived from the original on 10 June 2011. Retrieved 20 June 2011.

southcoastbikes.co.uk

"Derailleur Gears: A practical guide to their use and operation". Retrieved 27 June 2011.

terrymorse.com

"Rolling Resistance of Bike Tires". Archived from the original on 17 July 2011. Retrieved 20 July 2011.

velovision.com

Peter Eland (12 August 2002). "Schlumpf announces new High Speed Drive". Velo Vision. Archived from the original on 24 July 2011. Retrieved 17 May 2011.

vintage-trek.com

Trek Bicycle Corporation (1983). "Trek 620". Vintage-Trek. Retrieved 8 August 2012. Crankset: Sugino Aero Mighty Tour Forged Alloy Triple 28-45-50. Freewheel: Atom Helicomatic 6-spd 13-28 (13/14/17/20/24/28)

web.archive.org

"Cyclists Touring Club: internal gear ratios". Archived from the original on 2 July 2011. Retrieved 29 June 2011.
"Cycling Cadence and Bicycle Gearing". Archived from the original on 4 February 2012. Retrieved 18 July 2011.
"Internal Gear Hub Review". Archived from the original on 18 July 2011. Retrieved 20 July 2011.
"What Kind Of Drive The Cyclist Needs". Archived from the original on 3 July 2011. Retrieved 20 July 2011.
"Gear Theory for Bicyclists". Archived from the original on 10 June 2011. Retrieved 20 June 2011.
Peter Eland (12 August 2002). "Schlumpf announces new High Speed Drive". Velo Vision. Archived from the original on 24 July 2011. Retrieved 17 May 2011.
"Rolling Resistance of Bike Tires". Archived from the original on 17 July 2011. Retrieved 20 July 2011.
"Efficiency measurement of bicycle transmission". Archived from the original on 29 September 2011. Retrieved 22 July 2011.
"The mechanical efficiency of bicycle derailleur and hub-gear transmissions" (PDF). Archived (PDF) from the original on 25 July 2011. Retrieved 18 July 2011.
"Efficiency Measurements of Bicycle Transmissions" (Archived 14 November 2012 at the Wayback Machine) Bernhard Rohloff and Peter Greb (translated by Thomas Siemann) 2004. Rohloff's testing "at 400 watts, double what we did and found efficiencies approaching 98%".
"Efficiency Measurements of Bicycle Transmissions" (Archived 14 November 2012 at the Wayback Machine) Bernhard Rohloff and Peter Greb (translated by Thomas Siemann) 2004. "In our article we therefore concluded that hub gears are about 2% less efficient that derailleur transmissions under typical field conditions. We see no reason to change that conclusion."