56-560: (Redirected from B-50 ) B50 or B-50 may refer to: B-50 Superfortress , an airplane BSA B50 , 500cc motorcycle International Statistical Classification of Diseases and Related Health Problems (ICD-10), code for Plasmodium falciparum malaria Leyland Royal Tiger , a UK bus Sicilian Defence , an Encyclopaedia of Chess Openings code A Vietnamese RPG-2 rocket-propelled grenade launcher B-50, alias of Gap-43 protein HLA-B50 ,
112-705: A 1000 cc engine capacity class. The new FIM Formula 2 class for Sidecars was introduced for the 1990 Isle of Man TT. The 2015 specifications for entries into the Sidecar TT race are: For the 1911 Isle of Man TT , the first TT event using the Snaefell Mountain Course or Mountain Course , two separate races were introduced. The first event was a four lap Junior TT race and a separate Senior TT race for 500 cc single-cylinder and 585 cc twin-cylinder motorcycles, over five laps of
168-661: A HLA-B serotype Bestune B50 , a compact sedan [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with the same title formed as a letter–number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=B50&oldid=1228263887 " Category : Letter–number combination disambiguation pages Hidden categories: Short description matches Wikidata All article disambiguation pages All disambiguation pages BSA B50 The BSA B50
224-526: A casualty. They also have other duties such as course inspection, observation of machines on the course for visible faults, and review and report any course incidents. As of 2023, all travelling marshals rode Honda CBR1000RR Fireblades. The 1982 Road Racing Act (Isle of Man) and the supplementary TT Road Races Orders allow vehicles and pedestrians to cross the Snaefell Mountain Course at certain points between scheduled race periods under
280-516: A few prototype P92 models. This model comprised a B50 engine in a BSA Fury / Triumph Bandit frame using Isolastic mountings from the Norton Commando . The US DOT had mandated that all motorcycles sold in the US should have a left hand gear change. The B50 had the gear lever on the right, so to comply with this requirement, the engine was tilted forward in the frame and a gear linkage run under
336-595: A single race with two classes for the 1907 Isle of Man TT, expanding in 1911 to two individual races for the 350cc Junior TT motor-cycles and the Blue Riband event the 500cc Senior TT race. The race did not take place from 1915 to 1919 due to the First World War. It resumed in 1920. A 250cc Lightweight TT race was added to the Isle of Man TT programme in 1922, followed by a Sidecar TT race in 1923. There
392-439: A single removable 'pod'. BSA kept production costs down by using parts across a range of models, launched in 1971. About 5,700 were built. Some B50s were modified for off-road use by specialist builders such as Eric Cheney . B50 bikes were successful in both road-racing and off-road events. A modestly modified B50 Gold Star 500 entered by Mead & Tomkinson of Hereford, England and ridden by Nigel Rollason and Clive Brown won
448-406: A six-speed belt drive Charlie Collier riding a Matchless motorcycle finished second in the 1911 Senior TT race and was later disqualified for illegal refuelling. During an early morning practice session for the 1911 Isle of Man TT races, Victor Surridge died after crashing his Rudge motorcycle at Glen Helen , the first death of a competitor on the Snaefell Mountain Course and the first death in
504-412: A valid National Entrants or FIM Sponsors Licence for Road Racing. Entrants must also cite pre-filled documentation of completion of a UK driving licence or motorcycle certification, or a driver's licence from a comparable country that is recognised by UK comparable department of transportation standards and may withhold due to any pre race or post race suspensions. The 2015 specification for entries into
560-508: A weight limit of 3,500 kilograms (3.4 long tons; 3.9 short tons). When used for vehicular traffic, pedestrian access is prohibited, but at other times it is part of a system of nature trails . Between 1907 and 2023, there have been 156 fatalities during official practices or races on the Snaefell Mountain Course, and 269 total fatalities (this number includes the riders killed during the Manx Grand Prix, and Clubman TT race series of
616-503: Is now promoted by the Isle of Man Government Department for Enterprise. There has been criticism of the event. In 2007, an incident during the Senior Race resulted in the deaths of a rider and two spectators. The resultant inquest made several recommendations and included several comments, such as: 'Senior Marshals may well have been elevated beyond the sphere of their competence'. The coroner also noted that "I am more than aware of
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#1732772034829672-419: Is often called one of the most dangerous racing events in the world as many competitors have died . The Isle of Man TT is run in a time-trial format on public roads closed to the public by an Act of Tynwald . The event consists of one week of practice and qualifying sessions followed by one week of racing. It was a tradition, perhaps started by racing competitors in the early 1920s, for spectators to tour
728-590: The 1926 event the Sidecar and Ultra-Lightweight TT classes were dropped due to lack of entries. The Sidecar race was re-introduced from the 1954 event for Sidecars not exceeding 500 cc engine capacity, run on the Clypse Course . A non-championship 750 cc class for sidecars was introduced at the 1968 event . For the 1976 event the race was held over two-legs. From 1975, the previous 500 cc and 750 cc classes for Sidecars were replaced by
784-512: The Isle of Man of a person in an automotive accident. The 2015 specifications for entries into the Senior TT race are: The Clubman races with Lightweight, Junior and Senior classes were held for production motorcycles from 1947 until 1956 . A Senior 1000 cc class provided an opportunity for Vincent motorcycles . The riders were little-known, but as the stars were barred from entering
840-538: The Motor Sports Association , all refused to release the report as it was confidential and privately owned by the ACU. The ACU admitted liability for the accident, but instructed that any legal claim for compensation by Mercer must be filed in the Isle of Man. The ACU stated that Mercer was receiving financial assistance through its "extensive insurance arrangements". In 2019, it was reported that
896-479: The Snaefell Mountain Course on motorcycles during the Isle of Man TT on 'Mad Sunday', an informal and unofficial event held on the Sunday between Practice Week and Race Week. In 2022, race organizers announced that beginning in 2023, racing would take place on Sunday after practices to allow visitors to see more events, marking the end of Mad Sunday. The first Isle of Man TT race was held on Tuesday 28 May 1907 and
952-510: The 150 kg limit for the 650cc machines, but 2023 saw this changed and all bikes in the class now have a minimum weight of 150 kg. The 1923 TT was the first time the Sidecar TT race was run, over three laps (113 mi or 182 km) of the Mountain Course and was won by Freddie Dixon and passenger Walter Denny with a Douglas and special banking-sidecar at an average race speed of 53.15 mph (85.54 km/h). For
1008-731: The 2003 race by Sports Illustrated writer Franz Lidz called the TT "a test of nerves and speed that may be sports' most dangerous event." In 1976, the Isle of Man TT lost its world championship status; this was transferred to the United Kingdom by the FIM and run as the British Grand Prix for the 1977 season . The Isle of Man TT Races then became an integral part of the new style TT Formula 1 , Formula 2 and Formula 3 World Championships between 1977 and 1990 to develop and maintain
1064-716: The 500cc class in both the Thruxton 500 miler and the Barcelona 24 hours ( at the Montjuïc circuit ), and won the Zolder 24-hour race outright. Also, a B50 fielded by Mead & Tomkinson once held the class lap record in the Production Isle of Man TT . After the demise of BSA, Alan Clews bought up remaining B50 part stocks and set up Clews Competition Motorcycles , producing successful CCM motocross bikes based on
1120-614: The 600 cc Supersport class. The 2015 specifications for entries into the Supersport TT race are: Minimum Weight 161 kg The 2015 specifications for entries for the Superstock TT , an event for production based motorcycles racing with treaded road tyres, are based on the FIM Superstock Championship specifications, as follows: Minimum (Dry) Weight 170 kg Supertwin TT 2022 saw
1176-608: The B50. The BSA B50SS 'street scrambler' Gold Star was designed for road use and was partly aimed at the US market and proved its credentials by winning the 500cc class in the Thruxton 500 miler and the Barcelona 24-hour endurance race. Trail version The B50T was specifically designed with the fast-growing trail riding boom in mind in the US, with the bike using many parts common to both
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#17327720348291232-592: The Highroads Course. This was followed in September 1905 with the first Isle of Man Tourist Trophy Race for racing automobiles, now known as the RAC Tourist Trophy and was won by John Napier (Arrol-Johnston) in 6 hours and 9 minutes at an average speed of 33.90 mph (54.56 km/h). For the 1905 Gordon Bennett Eliminating Trial it was decided to run an eliminating trial for motorcycles
1288-438: The Isle of Man TT in 1962. There was subsequently a ban on women in the race from 1962 until Hilary Musson competed in 1978. The race is regarded as the most dangerous motorsport event in the world; The New York Times said in 2017 that the number of deaths had risen "to 146 since it was first run in 1907; if one includes fatal accidents occurring during the Manx Grand Prix ... the figure rises above 250". An account of
1344-477: The Isle of Man for the 52.15-mile (83.93 km) Highroads Course for the 1904 Gordon Bennett Eliminating Trial which was won by Clifford Earl (Napier) in 7 hours 26.5 minutes for five laps (255.5 mi or 411.2 km) of the Highroads Course . The 1905 Gordon Bennett Trial was held on 30 May 1905 and was again won by Clifford Earl driving a Napier automobile in 6 hours and 6 minutes for six laps of
1400-730: The Isle of Man in 1904 with the Gordon Bennett Eliminating Trial, restricted to touring automobiles. As the Motor Car Act 1903 placed a speed restriction of 20 mph (32 km/h) on automobiles in the UK, Julian Orde, Secretary of the Automobile Car Club of Britain and Ireland approached the authorities in the Isle of Man for the permission to race automobiles on the island's public roads. The Highways (Light Locomotive) Act 1904 gave permission in
1456-535: The SS and MX versions. The B50MX was designed for off-road competition and produced between 1971 and 1973. The very last MX's produced were therefore coming off the production line after the demise of BSA and were 'badged' as the Triumph TR5MX. In an attempt to make new models from existing BSA/Triumph parts, a Triumph T100C engine was fitted into modified B50 cycle parts. Launched in late 1972 (1973 model year),
1512-588: The Superbike TT race are defined as: Minimum Weight 165 kg (364 lb). Other machines admitted at the discretion of the Organisers The 1911 Isle of Man TT was the first time the Junior TT race took place, open to 300 cc single-cylinder and 340 cc twin cylinder motorcycles, contested over five laps of the new 37.5-mile (60.4 km) Snaefell Mountain Course. The first event on
1568-492: The Superstock class replaced the previous 1000 cc and 600 cc Production TT classes that had been part of the race schedule since 1989. The TT Zero was a one lap race for electric bikes running from 2010 to 2019. It was announced that the race would take a two-year break after 2019, but it never came back on the schedule since. After the completion of a practice or race period, an official course vehicle displaying
1624-415: The accident the organisers changed their protocols, requiring that returning riders must be controlled by motorcycle-mounted travelling marshals to the front and rear. An independent inquiry into the circumstances was arranged by ACU Events, the event organisers. The Auto-Cycle Union , the Isle of Man Department for Enterprise, and the inquiry report author, lawyer Rob Jones, a former chief executive of
1680-526: The class, it provided a stepping-stone for future-stars but resulted in less spectator-interest. The series became dominated by one model – the BSA Gold Star , and with little competition from other manufacturers, was discontinued. When previewing the impending re-introduction of a specification-controlled, roadster-based class in March 1967, David Dixon wrote: " lack of inter-make rivalry probably put
1736-659: The day afterwards for a team to represent Great Britain in the International Motor-Cycle Cup Races. An accident at Ramsey Hairpin forced out one of the pre-race favourites, and the inability of the competitors to climb the steep Mountain Section of the course forced the organisers to use a 25-mile (40 km) section of the Gordon Bennett Trial course. This ran from Douglas south to Castletown and then north to Ballacraine along
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1792-465: The driver of the car in the collision had quit after criticism that he exceeded a newly introduced speed limit recorded by a GPS tracking device when he drove to attend a fatality involving Chris Swallow at Ballaugh in August's Senior Classic TT. Gary Thompson, Clerk of the Course and an ACU employee, had been criticised in 2018 for also fulfilling the role of Safety Officer; consequently a new incumbent
1848-413: The dwindling support for the 500 cc race. A Production TT for roadster-based motorcycles having classes for maximum engine capacities of 250 cc, 500 cc and 750 cc was introduced from 1967 until 1976 when the class was discontinued. The Production TT was reintroduced for the 1984 races in three classes, reduced to two classes on safety grounds for the 1990 races. For the 2005 races
1904-556: The fact that the witnesses from the Manx Motor Cycle Club and the marshals are all volunteers. They give their time freely and without paid reward. Having said that however, if it were suggested because they were volunteers there should be some allowance in the standards expected of them, then I regret I cannot agree." The 2020 and 2021 TT races were cancelled because of the COVID-19 pandemic . Motor racing began on
1960-554: The final nail in the coffin ". Writing in UK monthly magazine Motor Cyclist Illustrated , racing journalist Ray Knight, who had achieved a lap speed of nearly 88 mph on a Triumph Tiger 100 roadster -based racing motorcycle in the Manx Grand Prix , commented in early 1965 that the ACU had refused a request from manufacturers to run a production TT race, which he thought was a missed opportunity, particularly considering
2016-424: The first race in 1907 have been in the format of time-trial. The races held on the Clypse Course during the period 1954–1959 were the more traditional full grid starts along with the 1924 Lightweight TT Race and Clubmen TT Races from 1948, which were also "mass-start" races. The current format is a "clutch start" and race competitors will be "started singly at 10-second intervals". Entrants must be in possession of
2072-503: The gearbox to provide a left hand gear change. The model never progressed to production. Specialist motorcycle designer Gerald Fitzpatrick created a 1000 cc BSA V-twin using parts from two B50 engines in 1977. The frame was a slimline featherbed Norton Atlas . Triumph considered putting the B100 into production but were not able to finance re-tooling costs. The B100 prototype was ridden for two years and has been stored since but
2128-655: The historic Douglas to Peel route, from the junction of the A5 New Castletown Road at the Quarter Bridge , passing under the course at Braddan Bridge , to an exit at Braddan School Road in Douglas outskirts, near the former Braddan Railway Halt and the A23 /Ballafletcher Road junction. The access road is a narrow, single-track width with passing places and is restricted to cars and light vans below
2184-617: The international racing status of the Isle of Man TT races. The event was redeveloped by the Isle of Man Department of Tourism as the Isle of Man TT Festival from 1989 onwards. This included new racing events for the new Isle of Man TT Festival programme, including the Pre-TT Classic Races in 1989 followed by the Post-TT Races from 1991, both held on the Billown Circuit . In 2013, the Isle of Man Classic TT
2240-485: The introduction of the supertwin race run over 3 laps on Wednesday the 8th of June, increased to 4 laps the following year. The class is very similar to the lightweight class which last ran in 2019, although with some differences. The maximum capacity has been increased to 700cc allowing the Yamaha YZF-R7 and Aprilia RS660 to compete. In 2022 bikes with capacities of 651cc+ were required to run 10 kg heavier than
2296-445: The late 1940s/1950s). In 2016, 5 riders died on the course during official practices or races. There were six fatalities among competitors in the 1970 and 2022 Isle of Man TTs, making them the two deadliest years in the history of the event. On 30 May 2018, an experienced TT rider, Steve Mercer, was seriously injured during a head-on collision with an official Course Car at Ballacrye . The car, being driven at high speed,
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2352-500: The new 37.5-mile (60.4 km) Snaefell Mountain Course. The new technical challenges of the Mountain Course forced changes on entrants and motorcycle manufacturers alike. The American Indian motorcycle factory fitted a two-speed gearbox and chain-drive. This proved to be the winning combination when Oliver Godfrey won the 1911 Senior TT race riding an Indian at an average speed of 47.63 mph (76.65 km/h). Fitted with
2408-543: The new course was the Junior TT Race contested by 35 entrants, won by Percy J. Evans riding a Humber motor-cycle at an average race speed of 41.45 mph (66.71 km/h). The 1912 event was the first to limit the Junior TT to only 350 cc machines and this engine capacity prevailed until 1976, after which the category was dropped. The event was instead run for 250 cc machines until 1994 when replaced by
2464-664: The new model was called the Triumph Adventurer in the UK and the Trophy Trail in the US, where most of the machines were sold on the East Coast. The model used Lucas electrics, Nippon Denso Speedo and rev counter and handlebar switches from Yamaha . Production continued into 1974, after which the model was dropped. A British team finished second in the 1973 IDST on these machines. As part of an attempt to produce new models from existing parts, NVT produced
2520-601: The notice Roads Open proceeds around the Mountain Course, passing each point opening the roads including side-access junctions to public use. On the Snaefell mountain road section from Ramsey to Douglas, the official vehicle displays the notice Roads Open One Way. Originally introduced in 1935, there are eight machines positioned around the course to provide a rapid response to any incidents. Selected riders have previous race experience and are first-aid trained, with machines carrying medical equipment that can assist in managing
2576-505: The period 1949 – 1976 . Following safety concerns with the Snaefell Mountain Course and problems over inadequate "start-money" for competitors, there was a boycott of the Isle of Man TT races from the early 1970s by many of the leading competitors, motorcycle manufacturers and national motorcycle sporting federations. Beryl Swain became the first woman to compete in a TT race for solo motorcycles when she competed in
2632-527: The primary A3 road and returning to the start at the Quarterbridge in Douglas via Crosby and Glen Vine along the current Snaefell Mountain Course in the reverse direction. The 1905 International Motor-Cycle Cup Race for five laps (125 mi or 201 km) was won by J.S. Campbell (Ariel) despite a fire during a pit stop in 4 hours, 9 minutes and 36 seconds at an average race speed of 30.04 mph (48.34 km/h). The TT Races since
2688-468: The supervision of a police officer. Several permanent pedestrian overbridges have been erected. These points include: The TT Access Road runs parallel to a section of the A1 Peel Road, which is part of the Snaefell Mountain Course , and operates during practice and race periods to enable vehicles to pass from inside of the race course to the outside. It runs along a section of former railway line on
2744-596: Was a single-cylinder 499 cc (30.5 cu in) ohv motorcycle , produced by BSA at their factory in Small Heath , Birmingham . The last of the big capacity unit-construction singles from the Birmingham Small Arms company , it had an alloy engine with a bore of 84 mm (3.3 in) and a stroke of 90 mm (3.5 in). As well as the road version, special models were produced for off-road competition use. BSA's earlier 500cc single
2800-477: Was conveying police officers to officiate at the scene of a fatality involving Dan Kneen . Mercer was unconscious for five days and hospitalised for five months due to multiple injuries. He was one of seven riders who had been halted on the course and turned back by marshals, being instructed to proceed back to the TT Grandstand area in the reverse direction after the red flag stoppage . Immediately after
2856-477: Was developed by the Isle of Man Department of Economic Development and the Auto-Cycle Union for historic racing motorcycles, and along with the Manx Grand Prix , it formed part of the 'Isle of Man Festival of Motorcycling' held in late August of each year. The Classic TT brand ceased operation prior to the 2022 event, with classes for historic racing motorcycles integrated into the Manx Grand Prix. The TT
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#17327720348292912-595: Was featured in the magazine British Bike Mechanics in April 1978 and January 1988. Isle of Man TT Joey Dunlop 26 (1977–2000) The Isle of Man TT or Tourist Trophy races are an annual motorcycle racing event run on the Isle of Man in May and June of most years since its inaugural race in 1907 . The event begins on the UK Spring Bank Holiday at the end of May and runs for thirteen days. It
2968-428: Was in place for 2019. From 1915 to 1919, and 1940 to 1946, no TT events took place, due to the outbreak of World Wars I and II . Events continued from 1920 to 1939 and 1947 to 2000. Since TT 1947, the Isle of Man TT has only been cancelled three times: 2001, 2020 and 2021, all of which were due to viral outbreaks. The 2001 Isle of Man TT races were cancelled because of the outbreak of foot-and-mouth disease in
3024-718: Was named the International Auto-Cycle Tourist Trophy. The event was organised by the Auto-Cycle Club over 10 laps of the Isle of Man St John's Short Course of 15 miles 1,470 yards for road-legal 'touring' motorcycles with exhaust silencers, saddles, pedals and mudguards. From 1911, the Isle of Man TT transferred to the much longer Snaefell Mountain Course of 37.40 miles (60.19 km) (current length 37.73 miles (60.72 km)). Its elevation goes from near sea-level to 1,300 feet (400 m). The race programme developed from
3080-724: Was no racing on the Isle of Man between 1940 and 1945 due to the Second World War . It recommenced with the Manx Grand Prix in 1946 and the Isle of Man TT in 1947, with a greatly expanded format that included the new Clubman's TT races. The Isle of Man TT became part of the FIM Motor-cycle Grand Prix World Championship (now MotoGP ) as the British round of the World Motor-Cycling Championship during
3136-519: Was the BSA Gold Star , a pre-unit machine with a duplex frame similar to that of the Golden Flash twin . The Gold Star was not considered suitable for the progression to unit construction . The name was revived when the 250 cc BSA C15/Starfire was eventually developed into the 500 cc B50 (via the B40 & B44 ). The dry sump B50 included features such as "oil in the frame" and the electrics in
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