page_title: Jones Counter
section_title: Clain Jones Counter
hierarchical_section_title: Jones Counter / Models / Clain Jones Counter
caption_attribution_description: English: The original Jones Counter made by Clain Jones from 1973 to 1982.
context_page_description: The Jones Counter is a device fitted to the front wheel of a bicycle that counts the revolutions of the wheel. It was invented in 1971 by Alan Jones in order to measure the length of road running race courses. The counter has gears that drive a mechanical digital counter. One count typically corresponds to about 1/20th of a wheel revolution; this provides a resolution of about 10 cm in course length, although overall accuracy, depending on calibration and other factors, is lower, but normally better than 1 part in 1,000.
context_section_description: On the right is the original production version, manufactured by Alan Jones's son Clain from 1973 to 1982. The gearing produces 20 counts per revolution of the bicycle wheel.
caption: Original Jones Counter, 1975
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