In 1975, Dominion Road Machinery, later called Champion Road Machinery, introduced the world's largest production-model grader, the 80-T, which later became the 100-T. This machine was introduced in 1975 as the 80T with a Detroit 16-71N Engine but by 1977 it was modified and repowered with an Cummins V1710 set at 700 hp.
It was a poor seller and reportedly only about 10 of these machines were ever sold before Champion discontinued the product a dozen years later. The model number approximates the weight of the machine in tons. It had a 24 foot blade and an articulated frame. Although bigger graders have been custom made, this seems to qualify as the world's largest production grader.
Champion is now part of Volvo, but has a storied history as Champion from Canada. The roots of the product can be traced to a US Patent for a horse drawn grader in 1872 with Champion and its predecessor companies making graders in Canada since 1892.