Similar questions: cycling term sag vehicle riders.
"Support And Gear" is one common interpretation of the acronym steephill.tv/galleries/2005/high-pyrenees/ Wikipedia has more: "SAG station A location along the course of a long mass-participation recreational ride providing mechanical and/or medical assistance to riders in need. Volunteers at the SAG station may also dispatch SAG wagons to assist riders stranded along the course. A SAG station may also function as a food stop.
"SAG" (most commonly written in all uppercase) may derive from a rider "sagging" off the back of the group, or it may be an acronym (or a backronym) for "Support And Gear" or "Support Aid Group. " edit SAG wagon Support motor vehicle following long races or recreational rides to pick up riders unable to complete the event. See also: food stop and SAG station.
In racing events, typically the main group of riders will ride as a peloton and can be served by one or more SAG wagons trailing behind. In large recreational rides, there may be thousands of riders spread over much of the course, so ride organizers may employ roving SAG wagons to locate and assist stranded riders.In bicycle racing, another term for SAG wagon is broom wagon. " http://en.wikipedia.org/wiki/Bicycling_terminology#S Sources: steephill.tv/galleries/2005/high-pyrenees/; http://en.wikipedia.org/wiki/Bicycling_terminology#S .
For those whose strength is sagging "Sag" is as in "sagging behind". In events with lots of non-professionals (including running events), the sag wagon picks up people who have fallen behind or are dropping out. The rhyme of "sag wagon" surely helped form the name.
Professional events don't have people sagging behind like that, but they still need a support vehicle, and they adopted the name "sag" for it. I've heard some people expand "sag" as an acronym for "Support And Gear", but I think that's an after-the-fact coinage. For some reason, people have an inherent need to make up etymologies and pass them off as truth.
Lexicographers call these "folk etymologies", and the archives are full of them. Treating words as acronyms, like "tip" "to insure promptness", seems to be a popular hobby. In one marathon I've been to, the "sag wagon" is a bus that creeps along behind "tail end Charlie", the last person who is making the timing requirements before they close the course and re-open it to URL1 makes for a rather pathetic picture, one exhausted marathoner running about as slowly as one can run without actually stopping, trailed by a bus full of even more exhausted people.
It looks like a vulture waiting to swoop down on that person when they finally drop. Never been me, yet..
Is it cheaper to run an a/c compressor solid - no cycling on and off.
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