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Paul Oerth took up production in approximately 1990 and continued to about 2006. These models have a different gear ratio (260/11 counts per wheel revolution). In 2006, production of the necessary gears ceased, and an alternative plastic-encapsulated set of gears was introduced. This was short-lived,
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Before the counter is used, the bicycle must first be calibrated by being ridden on a straight section of road between marks whose separation has been accurately measured by steel tape. A calibration can then be calculated in terms of counts per kilometer. Next, the bicycle is ridden over the race
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race courses. The counter has gears that drive a mechanical digital counter. One count typically corresponds to about 1/20 of a wheel revolution (this varies if a different gear ratio is used); this provides a resolution of about 10 cm in course length, although overall accuracy, depending on
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course to determine its length. Finally, the bicycle is recalibrated by riding again over the calibration distance. This is done to check for changes in bicycle-wheel diameter due to temperature changes, air leakage, and other causes.
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To measure road-race courses, the counter is fitted to a bicycle between the left fork leg and the front wheel. The tab or tabs on the large ring gear engage with the spokes, thus providing drive to a
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The JOL counter is a variation of the Jones-Oerth model. Created by
Laurent Lacroix in 2000, its distinguishing feature is a 27" rotary cable that allows the user to mount the
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The original production version was manufactured by Alan Jones's son Clain from 1973 to 1982. The gearing produces 20 counts per revolution of the bicycle wheel.
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Development of a new model started in 2007. The first production units became available in April 2008 and were used for the measurement of the
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Almost all road running courses in the world are measured with this device. The Jones
Counter has been used to measure all
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The gearing (260/11 counts per wheel revolution) is identical to that of the Jones-Oerth model.
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60:. In addition, it has often been used to measure Olympic Road Race Walking Courses.
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calibration and other factors, is lower, but normally better than 1 part in 1,000.
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Jones
Counters: Upper- NYRRC model. Middle- Oerth model. Lower- Model JR
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to a bicycle. It was developed in 1971 by Alan Jones to
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211:"Measurement News No 132 Summer 2006 page 32"
141:Jones Counter on the front wheel of a bicycle
102:and the Oerth model went out of production.
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126:, which took place on April 13, 2008.
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278:The Measurement of Road Race Courses
263:Picture in course measurement lesson
133:Use for measuring road-race courses
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182:"The History of the Jones Counter"
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93:from 1983 to approximately 1990.
304:Sport of athletics terminology
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163:Short course prevention factor
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89:Production was taken over by
32:which adds the function of a
77:Original Jones Counter, 1975
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106:Jones-Oerth-Lacroix Counter
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241:Course measurement forum
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118:Jones Counter model JR
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54:1976 Montreal Olympics
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91:New York Road Runners
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28:is a type of bicycle
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299:Counting instruments
58:1980 Moscow Olympics
245:Designers' web site
147:Veeder-Root counter
114:on the handlebars.
112:Veeder-Root Counter
97:Jones-Oerth Counter
85:NYRRC Jones Counter
69:Clain Jones Counter
250:2008-07-08 at the
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52:courses since the
38:accurately measure
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281:(handbook of the
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216:. Archived from
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50:Olympic Marathon
34:surveyor's wheel
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252:Wayback Machine
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199:Lacroix Counter
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124:London Marathon
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56:except for the
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271:External links
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40:the length of
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26:Jones Counter
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225:. Retrieved
218:the original
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42:road running
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293:Categories
227:2007-11-02
169:References
248:Archived
157:See also
30:odometer
64:Models
221:(PDF)
214:(PDF)
186:USATF
283:IAAF
24:The
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