The International Cycling Union (the UCI, the Union Cycliste Internationale) has banned the recumbents from all the "big" races. They are simply not allowed to compete. The rules have been written in a way that precludes them being able to qualify. The efficiency of a recumbent would overwhelm the upright cycle riders. Read on.
AnswerThey have been, for a long time, but not in the same race alongside uprights.On the 3rd of February in 1934 an international cycling congress voted after a debate amongst a few individuals to create a rule that a recumbent did not conform with what they referrred to as ' their usual regulations'. It was an Italian named Bertolini that himself decided that a recumbent did not conform to his definition of a bicycle. This definition excluded recumbents from competing. The definition used the reference to a bicycle as having a 'diamond-frame'.
Recumbents did still race though, albeit in their own category, referred to as 'for vehicles with aerodynamic adaptions'.
But really folks, from a recumbent rider's point of view, the upright riders simply couldn't compete against those new-fangled machines.
And so it came to be that on the 20th of February, 1934, the last 'mixed ' race took place. It was a race in which Frenchman Francis Faure rode to victory against the uprights. His speed record remained unbeaten until May 2005.
Current argument still hinges on the upright cyclists' views that a recumbent is too hard to navigate when down low amongst a group of uprights.
The element used in bicycles is primarily aluminum.
You can find used bicycles for sale on Craigslist by visiting the "Bicycles" section of the website and searching for listings in your area.
You can find Craigslist used bicycles for sale by visiting the Craigslist website and searching for listings in the "bicycles" category in your local area.
Common seatpost diameters used in bicycles are 27.2mm, 30.9mm, and 31.6mm.
Bicycles are STILL used.
There is no specific collective noun for bicycles, in which case a noun suitable for the situation is used, for example a rack of bicycles, a row of bicycles, a standof bicycles, etc.
Sell used bicycles.
Common seat post diameters used in bicycles are 27.2mm, 30.9mm, and 31.6mm.
The standard bike axle diameter used for most bicycles is 9mm or 10mm.
A recumbent bike is a bike that reclines the user to a laid back position. It is used for people with problems with back support, and other disabilities. Here is a link with some more information http://en.wikipedia.org/wiki/Recumbent_bicycle
A person in a lateral recumbent position is lying on their side. This position can be either left or right lateral recumbent, depending on which side the person is lying on. It is often used in medical settings for patient comfort, to aid in breathing, or to prevent aspiration. Additionally, this position is commonly used in first aid for unconscious patients who are breathing.
The standard pedal thread size used in most bicycles is 9/16 inch.