What is "microstock"

a. Of or pertaining to a form of stock photography where the images are sourced on an individual basis, as from amateur photographers via the Internet.

Microstock is a form of full roll cage kart racing that originated in New Jersey.

They are powered by small 4-cycle engines (200 cc), generally starting out as 5 hp Briggs & Stratton engines originally referred to as "lawnmower" engines, since that is where the first engines were taken from. After being modified for racing, the engines can produce anywhere from 7 to 30+ hp, depending on the racing class. Microstocks were originally designed to hit speeds between 45-65 mph; however, modified racing has pushed them over 100 mph in some cases.

They generally race on asphalt oval tracks, but have also raced on street courses and dirt tracks as well. They are a rigid chassis design using no suspension. Microstock is considered one of the most inexpensive forms of kart racing.