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Google Earth is pretty accurate for straight line distances, for the UK at any rate. I did a small test of this by plotting some grid points from an Ordnance Survey map on Google Earth, and using two-point paths to measure the distances between them. Each section should have been 10 km long. The sum of 24 such sections was 239.999 km, i.e. only one metre ...


0

Try re-pairing the 510 with the speed/cadence sensor. It seems like it's not connected and the speed data is coming from the GPS rather than the sensor. As suggested by others, the alignment of the speed/cadence sensor is important, but it must be close since you seem to get a little cadence data before it drops out. Perhaps it's too close and your crank ...


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To setup bicycle computer you need to find out circumstance of your wheel in mm. Most reliable way I know is the following. enter some approximate value and call it c0 (circumstance initial) drive some track of well known length, athletic course, rowing track, 100km ride, anything that has some length and you know long it is. let's call this value dA ...


2

On this page, the following information is given. Use a roll out method ie measure circumference with a mark on the tyre and roll forward one exact revolution measure with a tape measure the distance covered preferably sat on bike, then put dimension into the custom setting for wheel size, youtube shows a good example. According to the manual ...


3

A 27.5" wheel is a 650b wheel, which is not listed. Your bike computer should have a way to do calibrations the old fashioned way -- by rolling the bike a known distance (typically something like ~10 meters) after mounting the magnet+sensor and from this, it will calculate the necessary parameters for the wheel size. If you don't have that ability, you ...


5

Look at page 23 and 24 of the manual and follow the directions for measuring tire rollout. Measure your front tire and select the wheel size on the chart that has the closest measurement to your tire. There can be a big difference in the circumference of different brand/model tires even if the stated size is the same. Measurement of the actual tire ...



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