Healthy and active
Join Date: Mar 2007
Location: Caldwell, Idaho USA
Bikes: mid-60's Dunelt 10-speed, Specialized Allez Sport Tripple, Trek 7.2 FX
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Concerning temperatures, if Fahrenheit is your normal reference and you want to "understand" Celsius temperatures, remember what the Europeans say: "Ten is cool, twenty is comfortable, thirty is hot." That works for a pretty good rule of thumb.
Concerning millimeters to inches, just remember that one inch is about 25 millimeters. So, a 56 cm frame is 560 mm. At 4 inches per 100 mm, 56 cm is about 22 inches.
Usually when I want to convert between English and Metric I am a long distance away from a computer. The little Palm program I mentioned is very portable. But, being able to make a reasonably precise conversion in your head is very helpful.