The Billown Circuit is a motorcycle road-race course used for the Southern 100, the Pre-TT Classic races and the National Road Races meetings near Castletown on the Isle of Man. Racing is held on public roads closed for racing by an Act of Tynwald, the parliament of the Isle of Man.
The course is 4.25 miles (6.8 km) long and is in the parishes of Arbory and Malew. The course start-line is on the outskirts of Castletown and the course includes parts of the primary A5 New Castletown Road, the A28 Castletown to Ballabeg road, the A7 Ballasalla to Port Erin road and the A3 Castletown to Ramsey road.
Following the closure of the former RAF Station at Andreas to motorcycle racing in 1954, and to celebrate the success of George 'Sparrow' Costain and Derek Ennett at the 1954 Manx Grand Prix, the Southern Motor Cycle Club (SMCC) proposed that a motorcycle circuit be developed in the area around Castletown in the Isle of Man.[1]
The proposal for a "South TT"[2] using roads around the new Castletown A5 by-pass and the Billown Mansion met with a lukewarm response, and an application for a grant of £500 for race expenditure was rejected by the Tynwald Race Committee in April 1955.[3] A grant of £500 from local businesses, including T. H. Coleburn for a public address system, enabled the first Southern 100 road race event to be scheduled for July 1955 as a club-level race meeting.[4]
The Billown Circuit became a regional registered circuit in 1956 and a National Racing circuit in 1957, with a maximum of 45 entries per class. In 1988 a new race meeting was introduced with the Pre-TT Classic races, followed by the National Road Races in 1990. The re-introduction of two-stroke racing at the 2008 Isle of Man TT, with a Lightweight TT and Ultra-Lightweight TT race, used the Billown Circuit to host Isle of Man TT races as part of the 2008 National Road Race meeting.
The lap record for the Billown Circuit is 2 minutes 12.735 seconds at an average speed of set by Michael Dunlop during the 2017 races.
| No. | Rider | Date | Place | Race | Event | Machine | |
|---|---|---|---|---|---|---|---|
| 1 | Maurice A.Bowdery | 10 July 1958[5] | Castletown Corner | 1958 Southern 100 | Junior | ||
| 2 | Tom Swindlehurst | 9 July 1964 | 1964 Southern 100 | Senior | 500cc Norton | ||
| 3 | Graham Naylor | July 1970 | Williams Corner | 1970 Southern 100 | Senior | ||
| 4 | Mike Pepper | July 1973 | Great Meadow | 1973 Southern 100 | |||
| 5 | Jim Farlow. | 9 July 1974 | Church Bends | 1974 Southern 100 | |||
| 6 | Tony Dickinson | 15 July 1981 | Billown Dip (Black hole) | 1981 Southern 100 | 250 Race | 247 Yamaha (F) | |
| 7 | Graham Williams | July 1983 | Church Bends | 1983 Southern 100 | |||
| 8 | John Tawse | July 1985 | Church Bends | 1985 Southern 100 | Practice | 250cc Rotax | |
| 9 | Steve Taylor | 10 July 1988 | Great Meadow | 1988 Southern 100 | Solo Championship | ||
| 10 | Andy Bassett | July 1991 | Billown Dip | 1991 Southern 100 | Practice | 350cc Yamaha | |
| 11 | Roger Allen | 2 June 1992 | Ballakeighan Corner | 1992 Pre-TT Classic | Vintage Classic Race | 498cc Triumph[6] | |
| 12 | Michael Bellerby | 30 May 1995 | Ballanorris | 1995 Pre-TT Classic | Senior Classic Race | ||
| 13 | Matthew Wood | 30 May 1995 | Ballanorris | 1995 Pre-TT Classic | Senior Classic Race | ||
| 14 | Rob Harrison | 18 July 1994 | Iron Gate | 1994 Southern 100 | |||
| 15 | Graham Hayne | July 1996 | Great Meadow | 1996 Southern 100 | Practice | 600cc Yamaha | |
| 16 | Michael Craig | July 1996 | Great Meadow | 1996 Southern 100 | Practice | 600cc Yamaha | |
| 17 | Dave Pinkerton | July 1996 | Great Meadow | 1996 Southern 100 | Practice | 350cc Yamaha | |
| 18 | Gavin Lee | 13 July 1999 | Williams Corner | 1999 Southern 100 | 250cc Yamaha[7] | ||
| 19 | Marc McDonald | 13 July 1999 | Williams Corner | 1999 Southern 100 | 600cc Kawasaki | ||
| 20 | Andy Brown | 9 July 2003 | Ballawhetstone | 2003 Southern 100 | 600cc — Ireson Yamaha[8] | ||
| 21 | John Dowling | 9 July 2003 | Ballawhetstone | 2003 Southern 100 (Sidecar Passenger) | 600cc — Ireson Yamaha | ||
| 22 | Tony Smith | 25 May 2006 | Iron Gate | 2006 Pre-TT Classic | Practice | ||
| 23 | Barry Pepperrell | 25 May 2006 | Iron Gate | 2006 Pre-TT Classic (Sidecar Passenger) | Practice | ||
| 24 | Phillip Dongworth | 14 July 2009[9] | Ballanorris | 2009 Southern 100 | Practice | 600cc Ireson Honda[10] | |
| 25 | David Jukes | 8 July 2013 | Ballakeighan Corner | 2013 Southern 100 | Practice | 600cc Yamaha | |
| 26 | Mark Madsen-Mygdal | 11 July 2013[11] | Castletown Stadium | 2013 Southern 100 | 600cc Race B | 600cc Yamaha | |
| 27 | Paul Thomas | 11 July 2013[12] | Osbourne's | 2013 Southern 100 (Sidecar Passenger) | Sidecar Championship Race | 600c Baker Yamaha[13] | |
| 28 | Dean Martin | 28 May 2016[14] | Billown Dip | 2016 Pre-TT Classic | Practice | ||
| 29 | James Cowton | 12 July 2018[15] | Stadium Bends | 2018 Southern 100 | 600cc Challenge Race | 600cc Kawasaki | |
| 30 |  Alan Connor | 11 July 2023 | Castletown Bypass | 2023 Southern 100 | Practice | Suzuki |
| width=500pt | Rider ! | Wins |
|---|---|---|
| Joey Dunlop, Ian Lougher | 42 | |
| Jason Griffiths, Chris Palmer | 22 | |
| Ryan Farquhar | 21 | |
| Dave Madsen-Mygdal | 19 | |
| Kenny Harrison | 18 | |
| Dave Leech | 17 | |
| Bob Heath, Dave Molyneux | 15 | |
| William Dunlop, Bill Swallow | 14 | |
| Bill Smith | 13 | |
| Lowry Burton, Bob Jackson, Jason Griffiths | 12 | |
| Derek Walley | 11 | |
| Barry Wood, Robert Dunlop | 10 | |
| Geoff Bell, Ray McCullough | 9 | |
| Mike Hose, Bud Jackson, Guy Martin | 8 | |
| Ian Bell, Nick Crowe, Selwyn Griffiths, Darran Lindsay | 7 | |
| Charlie Freeman, Bob Jackson, Phillip McCallen, Alan Oversby, Tim Poole | 6 | |
| Colin Bevan, Blair Degerholm, John Knowles, Dave Pither, Roy Richardson, Meryvn Stratford, Alan Steele, Charlie Williams, Derek Young, John Watson | 5 | |
| Ian Bell, Tony Baker, Mick Burcombe, Bill Davie, Geoff Hands, Alan Oversby | 4 | |
| Michael Dunlop | 3 | |
| Bill Currie,(Pete & Ron Hardy) Kenny Howles, Klaus Klaffenböck, Greg Lambert, Dan Sayle, Geoff Young, Rob Bellas | 2 |