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If measuring rollout is inconvenient,

You can get pretty close with a calculation using the rim diameter and tire width, but to make it even easier, here's a table of common sizes.

http://www.sheldonbrown.com/cyclecomputer-calibration.html#ccc (column "F" is circumference in mm).

It looks like your 2174 mm setting is probably too high, by about 3.5%. That would mean if it says you hit 50 mph on that wild descent, you were really only going a bit more than 48.
 
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