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FJR Motorcycle Forums
Technical & Mechanical Problems
Wheel differences - early and late Gen IIs
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<blockquote data-quote="mcatrophy" data-source="post: 842615" data-attributes="member: 3187"><p>I confirm 42 pulses per wheel revolution (I counted 84 magnet sections in my piccy), presumably alternating N-S-N-S... The older unit also had 42 teeth, so same pulses per rev for both.</p><p></p><p>To get pulses per mile:</p><p></p><p>Rear wheel diameter 17 inches,</p><p></p><p>Rear tyre width: 180mm, aspect ratio 55%, so tyre adds 180 x 0.55 / 25.4 x 2 or 7.8 (near enough) inches to the diameter, so total diameter = 24.8 inches.</p><p></p><p>Circumference = PI x diameter = 77.9 inches</p><p></p><p>There are 63360 inches to a mile, so 63360 / 77.9 = 813 revolutions per mile, 813 x 42 = 34156 pulses per mile (OK, some rounding errors in there, but I'm sure that's good enough).</p></blockquote><p></p>
[QUOTE="mcatrophy, post: 842615, member: 3187"] I confirm 42 pulses per wheel revolution (I counted 84 magnet sections in my piccy), presumably alternating N-S-N-S... The older unit also had 42 teeth, so same pulses per rev for both. To get pulses per mile: Rear wheel diameter 17 inches, Rear tyre width: 180mm, aspect ratio 55%, so tyre adds 180 x 0.55 / 25.4 x 2 or 7.8 (near enough) inches to the diameter, so total diameter = 24.8 inches. Circumference = PI x diameter = 77.9 inches There are 63360 inches to a mile, so 63360 / 77.9 = 813 revolutions per mile, 813 x 42 = 34156 pulses per mile (OK, some rounding errors in there, but I'm sure that's good enough). [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Wheel differences - early and late Gen IIs
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