What was the breed of the tallest recorded horse that stood at 21.2 1/2 hands high?

The tallest recorded horse in history, known to have stood at an impressive height of 21.2 ½ hands, was indeed a Shire. This breed is renowned for its remarkable size and strength, typically used as draft horses. Shires generally have a powerful build and a significant height, often exceeding 17 hands, making them the tallest horse breed overall. Their large stature and calm demeanor have made them favorites in various equestrian disciplines, especially those requiring heavy lifting or pulling.

In contrast, other breeds like Clydesdales, Arabians, and Thoroughbreds, while they also have notable characteristics and histories, do not match the Shire's record for height. Clydesdales, though large and sturdy, do not generally reach the extraordinary heights recorded in Shires. Arabians are prized for their endurance and elegance rather than height, typically standing between 14.1 to 15.3 hands. Thoroughbreds are renowned for their speed and athleticism in racing, with average heights usually between 15.2 to 17.2 hands, but they do not reach the towering heights like the Shire. Thus, the Shire breed accurately represents the height record specified in the question.