"That Mountain is Fast: An Unofficial History of Isle of Man Road Racing 1907 - 2023" is an unofficial history of the Isle of Man TT Races. Discover the ultimate tribute to the legendary Isle of Man TT Races with "That Mountain is Fast" with a compelling, data-rich history of one of the world's most thrilling motorcycle road racing events. Written by lifelong Isle of Man residents and motorsport enthusiasts at Sounded.com, who have experienced road racing on the Island, this book brings over 30 years of local insight to the page. From the first race in 1907 to the TT in 2023, this unofficial history celebrates the fearless riders who take on the iconic 37.73-mile Mountain Course each year. Featuring publicly sourced race statistics, personal reflections, and expert commentary, the book honors both the famous TT legends and the unsung heroes who return year after year to challenge the course, and themselves. Whether you're a long-time TT fan, a motorcycle racing enthusiast, or new to the thrill of road racing, That Mountain is Fast offers a unique and heartfelt chronicle of courage, speed, and history. The book is rich in racing data, with historic TT riders, machines and results. Not only are the great's included, but recognition is given to those riders who return each year facing challenges and without fear provide some of the greatest road racing in the World. A calendar spectacular each year in May for Motor Racing fans, That Mountain is Fast, an unofficial history of road racing in the Isle of Man, explores the challenges and time trails since 1907. This version has been updated to include statistics from the 2023 TT Races. Narrated by David Holmes, using TrueVoice, a Digital Replica licensed with consent.