Stem clamp sizes: 31.8; 26; 25.4;
Grip sizes: 22.2; 23.8
http://sheldonbrown.com/deakins/handlebars.html
The common mountain bike straight handlebar, the hybrid upright handlebar, and Trekking bar diameter are all 7/8" (22.2 mm.) This is not the diameter where the stem clamps , but the diameter of the rest of the handlebar, where one mounts the brakes and shifters. However, this is smaller than the current road handlebar diameter of 15/16" (23.8 mm.) See Sheldon's handlebar crib sheet
http://sheldonbrown.com/cribsheet-handlebars.html
http://www.performancebike.com/bikes/Product_10052_10551_1134821_-1_400210__400210
http://www.performancebike.com/bikes/Product_10052_10551_1033617_-1_400210__400210
http://store.qbike.com/origin8-hbar-mtb-alloy-flat-stash-2-25-4x450sl.html
http://www.ebay.com/itm/FSA-XC-300-Handlebar-20mm-Riser-Black-25-4mm-620mm-Mountain-Bike-180-0295-NEW-/130942875455?pt=US_Handlebars&hash=item1e7ccdb73f
http://www.ebay.com/itm/MOUNTAIN-BIKE-FLAT-STRAIGHT-BAR-HANDLEBAR-25-4mm-25-4-/290917368405?pt=US_Handlebars&hash=item43bc06c255
Ragley Luxy (on one) http://g-tedproductions.blogspot.com/2011/04/ragley-luxy-bars-update.html
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TREKKING
also called 'butterfly' bar or Touring bar
http://sheldonbrown.com/deakins/handlebars.html
https://www.crazyguyonabike.com/doc/page/?page_id=148091
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Velo Orange Swept Back Handlebar
https://velo-orange.com/pages/flat-and-upright-handlebar-selection
Stem Clamp Diameter - The measurement outside to outside of the area that clamps to the stem. 25.4mm - standard city, upright, and MTB bars;
Brake Lever Clamp Diameter - The measurement outside to outside of the bar where your brake levers and shifters clamp. 22.2mm - standard city and mountain components: trigger shifters, grip shifters, and some inverse brake levers.
Rise/Drop - Measurement from center of stem clamp to the center of the start of the grip area.
Sweep - Measurement from center of stem clamp to bar end.
Grip Length - Measurement of straight area of grip from end to end.
Stem
https://www.modernbike.com/sunlite-steel-touring-quill-stem
https://www.modernbike.com/nitto-mt-10-long-quill-stem-25.4-35-deg-x-100-silver