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i have an old cateye os 1.1 [img] 
[/img] wire computer,which i really like (it keeps the data of my rides e.t.c but have been querying some of the distances e.t.c that i have ridden. i have 26 X 2.10 wheels (and have double checked the configuration) and mph setting. yesterday it said that i did a 38.74 mile ride,but to me it didn't seem that long a distance (am not fit,just remembering other rides that were around that distance if that makes any sense?) have also found with other computers that they mess up sometimes (either due to heat/cold e.t.c) how do you check that it is still working properly? cheers in advance 🙂
find somewhere you know is exactly a mile and measure it with the computer?
If uve an phone / android try one of the logging app. I personally use memory map but there are plenty out there. Will certainly give u a ballpark figure to compare to on occasion.
Have you measured one revolution of front wheel and compared that figure to the 2.1 setting on computer?
Can differ slightly depending on tyres.
Do you ride with people who own GPS, compare numbers at the end of a ride. Or do a small road loop of a couple of miles and work out the distance on googlemaps or bikely. Measuring the circumference of the wheel works but small errors on this scale increase over miles. Maybe mark out ten revolution (chalk mark on tyre and road).
Go for a 10 mile ride, log your computer reading.
now do the same route in reverse, and log the reading.
If your computer reads 10 miles both ways, its accurate
HTH 🙂
+1GPS
Checked 2 Cateye's by taking a GPS along - on 700c (road bike) tyres, the Cateye was spot-on; on 26x1.25 tyres it read about 5% over (though I think the closest setting was 26x1.5)
Depending on where you live, most A roads, especially old ones, have white stones every mile. Find your nearest 2, zero the trip and ride from one to another, if it is wrong, adjust the wheel circumference number until it is correct, then ride with your wheels on the ground at all times. 🙂
Get the tape measure out. Use the full extension and the max revolutions you can fit in (2 or 3 if you can). Sit on the bike when you roll it forward.
Then get the calculator out. I have got mine very precise by doing this and i use it to measure out the various runs that i go on.
another for the gps. Or ride with mates. If yours is differnt its probably wrong.
I wouldn't check it against a phone gps, 4 of us who ride together use endomondo, 1 mememephone, 1 htc, and 2 different nokias, on each ride the distances vary greatly so wouldn't use those as a reference
I wouldn't check it against a phone gps, 4 of us who ride together use endomondo, 1 mememephone, 1 htc, and 2 different nokias, on each ride the distances vary greatly so wouldn't use those as a reference
+1
Is the 'max speed' suspicious? I occasionally saw 130mph on mine, it was triggering off the spokes as well as the sensor!
how accurate are school running tracks ? (not just lines on grass, the permanent ones)
Some towns have a measured mile (walked out with a wheel)for taxi drivers to calibrate their money makers. Ask around .
Have you measured one revolution of front wheel and compared that figure to the 2.1 setting on computer?
Can differ slightly depending on tyres.
While actually riding the bike of course. I put a computer back on my bike for the first time in years the other day and my measured wheel circumference was quite different to the cateye guide in the manual for that size tyre.
Motorways have marker posts every 100m (and bigger signs every km) just go and check your computer against those.
I'd start by setting the wheel size correctly, I put a dab of paint on the tyre, sit on the bike and roll forward until there are two paint marks on the floor (best not to do this in the living room). Measure the distance between the marks to get the tyre circumference (make sure the tyre is pumped up to the normal working pressure as this can affect the reading).
cheers everyone.will do the circumference route in mm. 🙂
Motorways have marker posts every 100m (and bigger signs every km) just go and check your computer against those.
Funny I'd never thought of going for a ride on the motorway.
HTHFunny I'd never thought of going for a ride on the motorway.