More references date May 2009 Image Cyclocomputer.jpg right thumb 200px A basic cyclocomputer showing speed and Odometer readings. Image Cyclocomputer sensor.JPG right thumb 200px A wired reed switch sensor with spoke mounted magnet. A cyclocomputer or cyclometer obs. is a device mounted on a bicycle that calculates and displays trip information, similar to the instruments in the dashboard of a car. The computer with display, or head unit , usually is attached to the Bicycle handlebar handlebar for easy viewing. History In 1895 Curtis Hussey Veeder invented the Cyclometer . ref The Horseless Age , New York The Horseless Age Company, Volume 40, No. 1, 1917 , p. 58 ref ref cite web url http www.ctheritage.org encyclopedia topicalsurveys inventors.htm title Connecticut Inventors author Robert Asher publisher Connecticut Humanities Council date 2003 accessdate 2011 03 01 ref The Cyclometer was a simple mechanical device that counted the number of rotations of a bicycle wheel. ref Veeder Root, Inc., http www.veeder.com page vr history Veeder Root History ref A cable transmitted the number of rotations of the wheel to an analog odometer visible to the rider, which converted the wheel rotations into the number of miles traveled according to a predetermined formula. After founding the Veeder Manufacturing Company, Veeder promoted the Cyclometer with the slogan, It s Nice to Know How Far You Go . ref Veeder Root Inc., Veeder Root History ref The Cyclometer s success led to many other competing types of mechanical computing devices. Eventually, cyclometers were developed that could measure speed as well as distance traveled. Modern Cyclocomputers Basic operation The head A basic cyclocomputer ..., Cyclocomputer Calibration calibrate the unit, and on some units, turn on a back light for the display ..., however, the bicycle with the set cyclocomputer must be ridden by the intended rider over an accurately ... A cyclocomputer displaying speed and time Besides variables calculated from the rotating wheels or crank ... more details
Unreferenced date November 2006 A crank sensor is a component used in an internal combustion engine to monitor the position or rotational speed of the crankshaft . This information is used by engine management system s to control ignition system timing and other engine parameters. Before electronic crank sensors were available, the distributor would have to be manually adjusted to a timing mark on the engine. The crank sensor can be used in combination with a similar camshaft position sensor to monitor the relationship between the piston s and Tappet valves in the engine, which is particularly important in engines with variable valve timing . It is also commonly the primary source for the measurement of engine speed in revolutions per minute . Crank sensors in engines usually consist of magnets and an inductive coil, or they may be based on magnetically triggered Hall effect semiconductor devices. Common mounting locations include the main crank pulley , the flywheel , and occasionally on the crankshaft itself. This sensor is the most important sensor in modern day engines. When it fails, there is a small chance the engine will start engine will likely cut out after a few minutes of driving but it mostly will not start. Citation needed date September 2009 Some engines, such as GM Premium V engine GM s Premium V family , use crank position sensors which read a reluctor ring integral to the harmonic balancer . This is a much more accurate method of determining the position of the crankshaft, and allows the computer to determine within a few degrees the exact position of the crankshaft and thereby all connected components at any given time. Another type of crank sensor is used on bicycle s to monitor the position of the crankset , usually for the Cadence cycling cadence readout of a cyclocomputer . See also List of sensors DEFAULTSORT Crank Sensor Category Engine sensors automotive tech stub el ... more details
dablink Cyclometer also means a person who works either on the classic squaring the circle circle squaring problem or on the geometry of circle s. For the device used in cycling, see cyclocomputer . File Cyclometer4.png thumb 175px Cyclometer , devised in the mid 1930s by Rejewski to catalog the cycle mathematics cycle structure of Enigma machine Enigma permutation s. 1 Rotor lid closed, 2 Rotor lid open, 3 Rheostat, 4 Glowlamps, 5 Switches, 6 Letters. The cyclometer was a cryptology cryptologic device designed, probably in 1934 or 1935, by Marian Rejewski of the Polish Cipher Bureau s German section BS 4 to facilitate decryption of German Enigma machine Enigma ciphertext . ref Marian Rejewski , Summary of Our Methods for Reconstructing ENIGMA and Reconstructing Daily Keys... , p. 242. ref History The cyclometer was used to prepare a catalog of the length and number of Cycle graph algebra cycles in the characteristics for all 17,576 positions of the rotors for a given sequence of rotors. Since there were six such possible sequences, the resulting catalog of characteristics, or card catalog cryptology card catalog , comprised a total of 6 17,576 105,456 entries. ref Marian Rejewski , The Mathematical Solution of the Enigma Cipher, pp. 284 87. ref The utility of the card catalog cryptology card catalog , writes Rejewski, was independent of the number of plug connections being used by the Germans on their Enigma machines and of the reconstruction of message keys . Preparation of the catalog was laborious and took over a year, but when it was ready... daily keys could be obtained within about fifteen minutes. ref Marian Rejewski , Summary of Our Methods... , p. 242. ref On November 1, 1937, however, the Germans changed the reversing drum, or reflector cipher machine reflector . This forced the Cipher Bureau to start over again and produce a new card catalog, a task, writes Rejewski, which consumed, on account of our greater experience, probably somewhat less than a year ... more details
and Shimano cassettes. The ErgoBrain cyclocomputer compatible with the Ergo shifters displays cadence, gear, and the normal functions of a cyclocomputer. Tour de France winners with Campagnolo Year ... more details
Team Strawberry ref name advent http www.adventurecorps.com when raam 1989raam1.html HPV s Across America RAAM Tests More Than Technology ref was a professional bicycle racing team that participated in experiments on human power performance conducted by their primary sponsor, Balboa Instruments of Newport Beach, California . The Team ref http www.raceacrossamerica.org subwebraam history rec1989.htm HPV DIVISION 4 man relay teams ref was founded in 1988 by team captain sports captain Alan R. McDonald. It lasted 2 years for the purpose of testing Bicycle aerodynamics and power , human power measurement and logging, and competing in the 1989 HPV Race Across America HPV RAAM . ref http www.ultracycling.com events raam.htm Ultra Cycling ref McDonald acquired New Zealand rider John Harvey, also an Ultra Marathon cyclist. They were later joined by Greg Ewing and Mike Haluza. During the 1989 RAAM, the team used the hi tech prototype cyclocomputer called the Power Pacer ref name powerpacer http www.trainingsmartonline.com power cycling training.php Training Smart ref designed by Balboa Instruments. The device measured each rider s individual performance for the total 2911 miles in terms of power output in watts and calories burned through an output device built into the rear wheel hub. ref http www.adventurecorps.com when raam 1989raam.html Chris Kostman ref ref http www.sheldonbrown.com rinard aero measuring.htm Rainer Pivit ref ref http ir.lib.sfu.ca bitstream 1892 6018 1 b14308745.pdf Leonard W. Brownlie ref Team members The four man team was led by Ultra Marathon cyclist Alan McDonald team captain . The four riders were ref name RAA http www.raceacrossamerica.org Race Across America ref Alan MacDonald of Huntington Beach, California Mike Haluza of Irvine, California Greg Ewing of Corona Del Mar, California John Harvey of Auckland , New Zealand The team s support crew was led by Crew Chief Karen Anderson, a RAAM veteran. Designer of the Power Pacer and mechanical engineer ... more details
Image Handlebar with fancy wrap.JPG thumb right Conventional drop handlebars with harlequin cloth tape wrapping. Image Mountain bike handlebar.JPG thumb right Flat handlebars with a slight rise on a mountain bike . Image BMX handlebar.JPG thumb right BMX style bars with cross brace. Bicycle handlebar or often bicycle handlebars refers to the steering mechanism for bicycle s the equivalent of a steering wheel . Besides steering, handlebars also often support a portion of the rider s weight, depending on their riding position, and provide a convenient mounting place for Bicycle brake systems brake levers , Shifter bicycle part shift levers , cyclocomputer s, bells, etc. Types of handlebar Handlebars come in a variety of types designed for particular types of riding. Drop Image Shimano 105 5500 shifters.jpg thumb right Drop ergo or anatomic handlebars Image Track Bars.JPG thumb right Track style bars with large radius curve Image Profile 2000 Aerobars.jpg thumb right Ergo or anatomic drop handlebars with added Profile 2000 Triathlon bars aerobars Drop handlebars, as used on Road bicycle road or track bicycle track bicycles, may have a shallow or deep drop. Drop bars may have one or two longitudinal indentations so that the brake and shift cables protrude less when they are wrapped under the bar tape. They may also have a flattened top section. Track Track drop bars are a variation of bars designed for the typical riding positions of track bicycle racers. Track drops are characterized by large, sweeping ramps, effectively precluding the top and brake hood hand positions, but promoting the rider s use of the ends, or hooks . Track bars are designed for use without brake levers, but recently experienced a surge in popularity on use with fixed gear bikes, and as such have been adapted to fit levers and hand positions. Ergo or anatomic The shape of the drop may be a simple, traditional curve, or it can have a flat spot straight section which some riders find to be more comf ... more details
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