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Old 02-20-06, 10:51 PM   #1
compulsivebikr
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computer headaches!

Hi everyone. I just installed a Cateye Mity 8 computer, and it seems to be working fine except for the mileage readings, which are much, much higher than the acutal miles I ride. The other data, for example mph, seems to be accurate. I know that I've calibrated correclty (tire size 700 x 32, setting - 216) so that's not the issue. Anyone else experience anything similar or know what I'm doing wrong? Thanks!
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Old 02-21-06, 07:41 AM   #2
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Did you leave it calibrated in KM instead of Miles? That would give you a reading 62% high.
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Old 02-21-06, 10:37 AM   #3
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Hopefully, you set the calibration by actually sitting on the bike, tires inflated to riding pressure, and measured one complete revolution, then followed the instructions for setting the number on the computer. Just going by tire size may not give an accurate reading. Just changed tires on my mtn bike-same "size", but the new tires have a higher sidewall-if I left the old (which was accurate with the old tires) setting on the computer, then it would be off with the new tires. Normally, for mph reading, you measure one complete revolution, then mult. by 25.4 and enter that number in the cyclometer.
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Old 02-21-06, 10:39 PM   #4
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Thanks, that helped. I got a larger wheel circumference measuring this way, so hopefully the error should be corrected. Thanks!
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Old 02-21-06, 10:43 PM   #5
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Whatever the problem is, I bet you've still got it. I don't think it's possible to set speed for mph and odometer for kilometers. Of course, I've been wrong before.
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Old 02-22-06, 07:26 AM   #6
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Originally Posted by Nermal
Whatever the problem is, I bet you've still got it. I don't think it's possible to set speed for mph and odometer for kilometers. Of course, I've been wrong before.
You are right, you can't. However, if the setting were left as KM, the speed values would be so encouraging that maybe he just liked what he saw and wanted to believe those numbers. Hey guys, I can ride 30 mph too!!!

What made me suspect the KM/Miles problem was the OP said the mileage figures were "much much higher than the actual miles I ride". This suggested more than a minor tire calibration error.
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Old 02-22-06, 12:04 PM   #7
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Oh. That sounds right.
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Old 02-22-06, 12:16 PM   #8
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It definitley is set for mph, not km. And, to clarify, "much more" means specifically a reading of 17 miles from a route that I know is no more than ten.
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Old 02-22-06, 03:25 PM   #9
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Quote:
Originally Posted by compulsivebikr
It definitley is set for mph, not km. And, to clarify, "much more" means specifically a reading of 17 miles from a route that I know is no more than ten.
Is it possible that you're viewing the odometer (total miles ridden since computer installation or reset) instead of the trip meter (total miles riden since the computer was turned on for the the most recent trip)?

I don't mean to insult you with my question, but we're running out of options here.
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Old 02-22-06, 03:41 PM   #10
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No insult taken, I've done plenty of stupid things in my life. But, no, I'm not reading the cumulative odometer. (Although the odometer is boosting my ego, telling me that I've ridden miles and miles....) I am going to try measuring my wheel circumference while I am actually on the bike, and see how this affects things. Probably won't happen until the weekend, I'll give an update then...
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Old 02-22-06, 04:48 PM   #11
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Well, 17 miles instead of 10 is about (actually larger) a 60% error which is why I suggested the KM/Miles error.
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Old 02-22-06, 04:56 PM   #12
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freeranger is right...............even though it gives a setting. Inflate to riding pressure and measure off your tire circumference to get your bikes actual. You will be right on the money!
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Old 02-27-06, 06:32 PM   #13
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freeranger is right...............even though it gives a setting. Inflate to riding pressure and measure off your tire circumference to get your bikes actual. You will be right on the money!
That's exactly what I did, and, lo and behold, my computer seems to be working perfectly. Thanks, everyone, for all your help!!
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