'Fearless' behind the scenes
Northern Irishman Jamie Hamilton during the 2015 TT Supersport race on October 6, 2015, held on public roads on the Isle of Man. A crash in the later Senior race on one of the fastest parts of the course left him in critical condition with a badly broken right leg. His hometown newspaper, the Belfast Telegraph, described the crash as a "fireball horror smash."
Harry Collier on a Matchless bike at the Isle of Man Senior TT in 1912, the second year the "Tourist Trophy" race was run on the same Snaefell Mountain Course circuit still in use today. The Collier family founded the Matchless company in 1899. It was one of Britain's earliest motorcycle manufacturers.
Way back machine
Scottish racing motorcyclist Bob McIntyre cornering on his Honda during the Lightweight 250cc event at the Isle of Man TT races, in June of 1961. Although the leader for much of the race, McIntyre was forced to withdraw after his engine failed on the last lap.
Classic side car racing
Isle of Man TT Racing 500 CC Side Car Class., June 1969. The Isle of Man Side Car TT race dates back to 1923. In Side Car class racing the passenger sometimes referred to as the "monkey" or "swinger" -- moves to the inside of the turn to provide counterbalance.
The Legend Joey Dunlop
In 2016, Motorcycle News voted Irishman Joey Dunlop #2 on its list of the all-time motorcycling greats. Among other accomplishments, Dunlop -- shown here celebrating a 1996 win and racing in the 2000 Isle of Man TT -- won a record 26 Isle of Man TT races during his career before his death in a crash in Tallinn, Estonia in 2000. The "Joey Dunlop Cup" is now presented annually to the most successful overall rider at the Isle of Man TT races; his son Michael Dunlop is a new star of the races.
Son of a legend
Northern Irishman Michael Dunlop, son of motorcycle racing legend Joey Dunlop, set the solo-machine lap record on the Snaefell Mountain Course at the 2016 Isle of Man Senior TT with a time of 16 minutes 53.929 seconds, the first ever to break the 17-minute mark. Average speed: 133.962 miles. He now has 13 career TT wins and 19 podiums.
A competitor passes at the Gooseneck during Practice of the Isle of Man TT (Tourist Trophy) Races on May 31, 2007 in Ramsey, Isle of Man. Top speeds on the course can reach 200 miles per hour.
A new electric bike category, TT Zero, was added to the Isle of Man TT races in 2010. Englishman John McGuiness won the TT Zero races in 2014 and 2015. His average speed on the course in 2015 was just under 120 miles per hour.
Ian "Hutchy" Hutchinson's return to Isle of Man TT racing after shattering his left leg in 2010 crash is nothing short of miraculous. Determined to save the leg from amputation, he had more than 30 surgeries over a period of three years before taking three wins -- and the Joey Dunlop Cup -- at the Isle of Man TT races in 2015. Hutchinson, shown here during evening practice at this year's races, logged three more race wins at the 2016 Isle of Man TT.
A motorbike fan wears TT badges on June 7, 2009 in Peel, Isle Of Man. The annual TT race is one of the highlights of the motorbike racing calender with fans traveling from around the globe to watch riders compete in the 37 and three quarter mile lap exceeding speeds of 200mph.
Brothers Ben and Tom Birchall won their fourth TT Sidecar race in 2016. Team Birchall owns the Sidecar TT lap record with an average speed of 116.797 miles per hour. Sidecar racing has been a staple at the Isle of Man TT since its debut in 1923.
Ian Hutchinson, competing in the Supersport category at the Isle of Man TT.
"Not only is it the longest circuit in the world, it's got to be one of the hardest circuits in the world, for sure one of the most dangerous courses in the world," says John McGuinness, on chasing Joey Dunlop's all-time win record of 26 Isle of Man TT victories (McGuinness currently has 23). "You've got 250 plus corners. You've got manholes. You've got trees. You've got curbs. You've got weather conditions."
John McGuiness leads David Johnson, Coner Cummins and Michael Dunlop over the mountain section during an evening practice at The Isle of Man TT Races in June of 2016 on Douglas, Isle of Man.
Fearless airs on ABC
Michael Dunlop logged his 13th career win and set a new lap record at the Isle of Man TT in 2016. He's now halfway to his dad's all-time win Isle of Man TT win record of 26. Tune into the "World of X Games" on Dec. 18 at 2 p.m. ET for 'Fearless.'