This is a good QuestionHow do you know that your speed is wrong?
The problem here is that the computer reads too fast. If missing the magnet were the problem then the computer would read too slow.You can try placing the sensor closer to the hub. In this case the speed that the magnet that will passing by the sensor will be less and there is less of a chance of the computer "missing" a few measurements.
Originally Posted by coneofsilence .
Have you tried resetting the computer to get it back on the original language?
It should say on your tyres what size they are.
there is no "usual" what the manf publishes and what the tires actually measure out to re 2 different things, thats why whenever I switch tires I take the extra 20 seconds to take an actual measurement.Originally Posted by finnrambo .
usually 2124mm isn't it?
Originally Posted by jwroubaix .
My Sigma computer is reading too fast. I've tried moving the sensor on the front wheel but then it won't read it. Any suggestions?
Go by your tire size. I have a model 506 - for example, on mine, according to the manual for 700x23 tires the setting is 2133, for 700x25 it's 2146. Which model do you have? BTW - I have also had one strange thing happen, it appears that the sensor can also pick up stray electromagnetic fields - I rode by a transformer one day a while back and my speed reading shot up to 199.5 MPH.jwroubaix said:How do I find out exactly what my wheel size is?
Originally Posted by cyberlegend1994 .
Quote: Originally Posted by jwroubaix .
How do I find out exactly what my wheel size is?
Originally Posted by jwroubaix .How do I find out exactly what my wheel size is?
I think I am having the same problem. My speed is set to mph but the reading seems more like kmph. Sigma computers used to have a separate size chart if you were using mph vs kmph. This model (the 506) is supposed to do that conversion automatically - but it does not seem to be. You might try using the wheel size from the chart on the older model ( BC 500) .. so a 700x25 tire would be 1333 for mph instead of 2146 for kmph. Or you could divide whatever you think your wheel size should be by 1.61.My Sigma computer is reading too fast. I've tried moving the sensor on the front wheel but then it won't read it. Any suggestions?
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