27.5 Mountain bike

27.5 mountain bikes, also called tweeners,[1] are mountain bikes which use a large volume tire that is approximately 27.5 inches in diameter, 56 mm wide (ISO 56-584 / 27.5 x 2.25) on an ISO 584 mm rim.[2][3][4][5][6] The wheel size is also known as "650B",[7][8] and is used as a "marketing term" by some manufacturers for their 27.5", the 650B has traditionally been a designation for a 26 inch diameter (ISO ~ 40-584 demi-ballon tire) using the same ISO 584 mm rim[9] used by French tandems, Porteurs and touring bicycles.[4][7][10]

Merida Big Seven mountain bike with Schwalbe Racing Ralph 27.5" tires

The 27.5 inch are seen as a compromise between the two existing standards of the original 26 inch (ISO 559 mm rim) and recently emerged 29 inch (ISO 622 mm rim) mountain bikes (late 2000s). They were pioneered by Kirk Pacenti in 2007,[1][11] and as of 2013, at least 10 companies are launching models with 27.5 inch wheels,[4] and parts manufacturers are following suit.[2][5]

Nino Schurter won the World Cup event at Pietermaritzburg, South Africa,[6] and placed second in the Olympics in 2012 on 27.5 inch wheels.[3]

See also

References
  1. Josh Patterson (2012-03-22). "Catching Up With: Kirk Pacenti". Dirt Rag. Archived from the original on 2013-09-18. Retrieved 2013-07-05.
  2. Michael Frank (April 16, 2013). "The New Mountain Bike Revolution: 27.5-Inch Wheels". Adventure Journal. Archived from the original on 2013-05-20. Retrieved 2013-05-12.
  3. Lennard Zinn (April 24, 2013). "Back to 27.5". VeloNews. Retrieved 2013-05-12.
  4. Matt Phillips (2013). "Reviewed: 27.5 Mountain Bikes for All Trails". Mountain Bike. Archived from the original on 2013-05-09. Retrieved 2013-05-12.
  5. Vernon Felton (2013). "Ready or Not, Here Comes 650". Bike Magazine. Retrieved 2013-05-12.
  6. Josh Patterson (Oct 9, 2012). "650b mountain bike wheels: looking at the trends". BikeRadar.com. Retrieved 2013-04-19.
  7. Sheldon Brown (December 6, 2012). "Tire Sizing Systems". Retrieved 2013-04-10.
  8. "The 650B Wheel Renaissance". RideYourBike.com. Retrieved 2013-04-10.
  9. www.rideyourbike.com There is a common misconception that 27.5 refers to the diameter of the wheel. It does not, it refers to the aproxmiate diameter of a tire mounted on the 584mm diameter wheel. 584mm = 22.99". The 650B Wheel Renaissance - Retrieved 2017-02-23.
  10. www.bicyclequarterly.com Inside news from Bicycle Quarterly and Compass Bicycles - The Porteurs of Paris - Retrieved 2017-02-23.
  11. James Huang (March 4, 2013). "NAHBS 2013: Kirk Pacenti's eecranks". Cyclingnews. Retrieved 2013-07-05.
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