This has been a very enlightening - and entertaining - thread. Since you have 3 of this particular calculator, how do you like it? Anything I should know about it? You offered the simplest method (why didn't I think of that?) to measure the distance traveled by one revolution of the tire. or is it a very popular calculator for the price point?). Why do I buy the same computer? So I can have extra copies of the little folded up instructions.Monoborracho, I have the Cateye Enduro 8 (what an unbelievable coincidence. The hardest part is finding your own language on the little folded up manual, and then finding it again when you need. These three bike computers use a setting equivalent to the rolling circumference measured in centimeters. I have Cateye Enduro 8's on three of my bikes so I am always resetting something. +1 to the above EXCEPT, this would be off by a factor of 10 on my Cateye computers, and much more if your computer is in inches (83 x 25.4= 2108). Why do I buy the same computer? So I can have extra copies of the little folded up instructions. Maybe your computer uses 1/10th of an inch as the calibration, in which case 820 = 82 inches = 209.92 centimeters (go ahead and call it 210) which is also "standard" circumference listed by Cateye for a 26" x 1.5" tire, a mountain bike size. Cateye lists a circumference of 220 CM for a "standard" 700x40 bike tire, so your circumference should be about 86.6 inches.īut you have a default setting of 820? It might mean 82.0 inches. A 700 tire is about 83 0r 84 inches around, which would make a setting of 210 cm to 213 cm. That is the most accurate way to set the computer, using the actual rolling cirucmferenc. Measure the distance on the floor in inches and convert to centimeters (cm) by multiplying time 2.54. Roll it one revolution in a smooth straight line. If they do not, go to a smooth floor, set the inflation valve on the bottom, and mark the spot. The instructions should list a setting for this tire. You can calculate circumference with diamters and pie, or pigh, or pi, but Bill Kaupan above has it right. Then again, maybe it is set to use inches with mph and centimeters with km/hour. I think Yen's computer is set in units equal to 1/10th of an inch. ![]() Use the roll out method and multiply the inches traveled by 25.4 That's your number.+1 to the above EXCEPT, this would be off by a factor of 10 on my Cateye computers, and much more if your computer is in inches (83 x 25.4= 2108).
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