Kalex Moto2 Johann Zarco of France reacts as he wins the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny 

Kalex Moto2 Alex Rins of Spain reacts after finishing third in the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Second placed Kalex Moto2 Tito Rabat (rear R) of Spain and third placed Kalex Moto2 Alex Rins of Spain spray with champagne during the award ceremony for the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Third placed Kalex Moto2 Alex Rins (R) of Spain sprays with champagne at winner Kalex Moto2 Johann Zarco of France during the award ceremony for the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Kalex Moto2 Johann Zarco of France celebrates with a trophy after winning the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Winner Kalex Moto2 Johann Zarco (R) of France sprays champagne next to second placed Kalex Moto2 Tito Rabat of Spain during the award ceremony for the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Winner Kalex Moto2 Johann Zarco (R) of France sprays champagne at second placed Kalex Moto2 Tito Rabat (2nd L) of Spain and third placed Kalex Moto2 Alex Rins of Spain during the award ceremony for the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Kalex Moto2 Johann Zarco of France celebrates with a trophy after winning the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Kalex Moto2 Alex Rins (R) of Spain, Kalex Moto2 Franco Morbidelli (C) of Italy and Kalex Moto2 Dominique Aegerter of Switzerland compete during the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Kalex Moto2 Alex Rins of Spain competes during the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Kalex Moto2 Tito Rabat of Spain competes during the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Kalex Moto2 Johann Zarco of France competes during the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Kalex Moto2 Johann Zarco (L) of France leads a pack of riders during the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Kalex Moto2 Johann Zarco (R) of France leads a pack of riders during the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Kalex Moto2 Johann Zarco (L) of France leads a pack of riders during the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Honda Moto3 Niccolo Antonelli (L) of Italy leads a pack of riders during the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

KTM Moto3 Brad Binder of South Africa competes in the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Honda Moto3 Niccolo Antonelli of Italy reacts during the award ceremony after winning the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Honda Moto3 Niccolo Antonelli of Italy celebrates with a trophy after winning the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Moto3 motorcyclists compete in the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Honda Moto3 Niccolo Antonelli (R) of Italy and KTM Moto3 Miguel Oliveira of Portugal compete in the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Honda Moto3 Niccolo Antonelli of Italy competes in the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Winner Honda Moto3 Niccolo Antonelli (L) of Italy sprays champagne at third-placed KTM Moto3 Brad Binder of South Africa at the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Honda Moto3 Niccolo Antonelli of Italy celebrates after winning the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Honda Moto3 Niccolo Antonelli of Italy celebrates with a trophy after winning the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Moto3 motorcyclists compete in the Czech Grand Prix in Brno, Czech Republic, August 16, 2015. REUTERS/David W Cerny

Bob "The Sheriff" Schafer, of DuBois, Pennsylvania, shows off his bike wears while stopped at the Moonshine Gulch Saloon in Rochford, South Dakota, while participating in the annual Sturgis Motorcycle Rally in South Dakota, August 3, 2015. This year marks the 75th anniversary of the rally expected to draw hundreds of thousands of motorcycle enthusiasts from around the world for events throughout the week-long festival, according to organizers. Picture taken on August 3, 2015. REUTERS/Kristina Barker 

Pete Lalonde, of Germantown, Wisconsin, watches traffic along Main Street in downtown Custer while participating in the Annual Sturgis Motorcycle Rally in South Dakota on August 3, 2015. The massive event takes over the region's small towns and crowds spill far beyond the borders of the town of Sturgis. This year marks the 75th anniversary of the rally expected to draw hundreds of thousands of motorcycle enthusiasts from around the world for events throughout the week-long festival, according to organizers. REUTERS/Kristina Barker 

Veronique Joking, Michelle Hansen, and Karlene Wald, all of Minnesota, take a break along the side of a highway outside of Hill City, South Dakota, during the annual Sturgis Motorcycle Rally in South Dakota on August 3, 2015. The massive event takes over the region's small towns and crowds spill far beyond the borders of the town of Sturgis. This year marks the 75th anniversary of the rally expected to draw hundreds of thousands of motorcycle enthusiasts from around the world for events throughout the week-long festival, according to organizers. REUTERS/Kristina Barker 

Bikers walk along Main Street in downtown Custer while participating in the annual Sturgis Motorcycle Rally in South Dakota on August 3, 2015. The massive event takes over the region's small towns and crowds spill far beyond the borders of the town of Sturgis. This year marks the 75th anniversary of the rally expected to draw hundreds of thousands of motorcycle enthusiasts from around the world for events throughout the week-long festival, according to organizers. REUTERS/Kristina Barker 

The stage map is seen on the back of the helmet of the Reuters motorbike driver as he rides during the 7th stage of the 102nd Tour de France cycling race from Livarot to Fougeres, France, July 10, 2015. Photographing the Tour de France cycling race comes with highs and lows: the buzz from capturing just the right image, the tedium of long journeys, the painstaking set-up of equipment, the breath-taking scenery. Reuters photographers have worked not only to capture the thrills and spills on the roads and mountain passes. They have also shot a set of pictures showing their own quirky view from behind the scenes as they travelled through the Netherlands, Belgium and France. REUTERS/Stefano Rellandini TPX IMAGES OF THE DAY

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A Patriot Guard Rider follows a procession at the conclusion of the vigil for Marine Lance Cpl. Squire K. "Skip" Wells, one of the five military servicemen slain last week in Chattanooga in a domestic terror attack, at Sprayberry High School in Marietta, Georgia July 21, 2015. Wells, 21, a reservist, was the youngest victim of an attack being investigated as an act of domestic terrorism. He was killed last Thursday when authorities say Mohammod Youssuf Abdulazeez opened fire at a Naval Reserve Center in Chattanooga, Tenn., slaying Wells and three other Marines. A sailor later died of his wounds. REUTERS/Chris Aluka Berry 

A Burundian man transports a passenger and two pigs to markets in the capital Bujumbura July 19, 2015, as the country awaits next week's presidential elections. Opposition politicians have accused Burundi's President Pierre Nkurunziza of violating the constitution by running for a third term and are boycotting the vote due on July 21. REUTERS/Mike Hutchings? TPX IMAGES OF THE DAY

A volunteer distributes water bottles to commuters along a road during the intense hot weather in Karachi, Pakistan, June 24, 2015. A heat wave has killed nearly 800 people in Pakistan's financial hub of Karachi and piled pressure on a beleaguered provincial government, as rivals blame it for severe blackouts and crumbling public services that have added to the woe. REUTERS/Akhtar Soomro

Jake Messham performs on his bike as part of the 'Messhams Wall of Death' attraction as Dreamland Margate opens to the public at Margate in Britain, June 19, 2015. Billed as Britain's original pleasure park Dreamland re-opened on Friday with over 17 restored and retrofitted rides and amusements, after closing more than a decade ago. REUTERS/Dylan Martinez TPX IMAGES OF THE DAY 

Wisconsin Governor Scott Walker (2nd R), who is expected to make a bid to become a U.S. Republican presidential candidate, rides behind Iowa Senator Joni Ernst (R-IA) (R) during a motorcycle ride from Des Moines to a campaign event at the Central Iowa Expo in Boone, Iowa June 6 2015. REUTERS/Dave Kaup 

Wisconsin Governor Scott Walker (L), who is expected to make a bid to become a U.S. Republican presidential candidate, talks with Senator Joni Ernst (R-IA) before starting a motorcycle ride in Des Moines, June 6, 2015, to a campaign event at the Central Iowa Expo in Boone, Iowa. REUTERS/Dave Kaup 

Wisconsin Governor Scott Walker, who is expected to make a bid to become a U.S. Republican presidential candidate, shows off his motorcycle driver's license before a "Roast & Ride" fund-raising event sponsored by Senator Joni Ernst (R-IA) in Des Moines, Iowa June 6, 2015. REUTERS/Dave Kaup 

Wisconsin Governor Scott Walker (front on L), who is expected to make a bid to become the U.S. Republican presidential candidate, rides behind Senator Joni Ernst (R-IA) (front on R) during a motorcycle ride from Des Moines to a campaign event at the Central Iowa Expo in Boone, Iowa June 6, 2015. REUTERS/Dave Kaup 

Wisconsin Governor Scott Walker (L), who is expected to make a bid to become the U.S. Republican presidential candidate, talks with Senator Joni Ernst (R-IA) before starting a motorcycle ride in Des Moines, June 6, 2015, to a campaign event at the Central Iowa Expo in Boone, Iowa. REUTERS/Dave Kaup 

Wisconsin Governor Scott Walker (front on L), who is expected to make a bid to become the U.S. Republican presidential candidate, rides behind Senator Joni Ernst (R-IA) (front on R) during a motorcycle ride from Des Moines to a campaign event at the Central Iowa Expo in Boone, Iowa June 6 2015. REUTERS/Dave Kaup 

Wisconsin Governor Scott Walker (front on L), who is expected to make a bid to become the U.S. Republican presidential candidate, rides behind Senator Joni Ernst (R-IA) (front on R) as they pass a military park during a motorcycle ride from Des Moines to a campaign event at the Central Iowa Expo in Boone, Iowa June 6 2015. REUTERS/Dave Kaup 

Wisconsin Governor Scott Walker (L), who is expected to make a bid to become a U.S. Republican presidential candidate, talks with Senator Joni Ernst (R-IA) before starting a motorcycle ride in Des Moines, June 6, 2015, to a campaign event at the Central Iowa Expo in Boone, Iowa. REUTERS/Dave Kaup 

Wisconsin Governor Scott Walker (front on L), who is expected to make a bid to become the U.S. Republican presidential candidate, waves to another motorcyclist as he rides behind Senator Joni Ernst (R-IA) (front on R) during a motorcycle ride to a campaign event from Des Moines to the Central Iowa Expo in Boone, Iowa June 6 2015. REUTERS/Dave Kaup 

A custom Pepsi themed sport bike sits idle by the extreme traffic on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Brandy Shelton of Greensboro, North Carolina, 'twerks' for a group of bikers on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last yearÕs. REUTERS/Randall Hill TPX IMAGES OF THE DAY

Greek Finance Minister Yanis Varoufakis arrives on a motorbike at Maximos Mansion to attend a governmental meeting with Prime Minister Alexis Tsipras in Athens May 10 2015. Greece's main debt negotiator called on the European Union and the International Monetary Fund to show their willingness to break an impasse in debt talks, ahead of a crucial meeting of euro zone finance ministers on Monday. REUTERS/Kostas Tsironis TPX IMAGES OF THE DAY

A Russian motorbiker is greeted by Polish supporters of Russian motorbikers group "Night Wolves" after he crossed the EU border in Terespol April 27, 2015. Poland will not allow members of a Russian motorcycle club linked to President Vladimir Putin to cross its border and enter the European Union's territory, the Polish Foreign Ministry said on Friday, a decision Moscow said was politically motivated. Some 50 members of the Night Wolves, a group blacklisted by the United States for taking part in Russia's annexation of Crimea, are taking part in a bike ride from Moscow to Berlin, commemorating the end of World War Two. REUTERS/Kacper Pempel 

Members of the Night Wolves motorcycle club and other local Belarusian bikers lay flowers at the war memorial Mound of Glory during a bike ride commemorating the 70th anniversary of the victory over Nazi Germany in World War Two, outside Minsk April 26, 2015. Germany will block some members of an ultra-nationalist Russian motorcycle club from entering the country, government sources said on Saturday, a day after Poland also announced an entry ban for the group which is blacklisted by the United States. Some members of the Night Wolves, a group blacklisted by the United States for taking part in Russia's annexation of Crimea, are taking part in a bike ride from Moscow to Berlin, commemorating the 70th anniversary of the end of World War Two. REUTERS/Vasily Fedosenko TPX IMAGES OF THE DAY

Lelisa Desisa, of Ethiopia, runs to the finish line to win the men's division of the 119th Boston Marathon in Boston, Massachusetts April 20, 2015. REUTERS/Gretchen Ertl

A stuntman rides a motorcycle inside the "Well of Death" attraction during a fair in Bhaktapur April 20, 2015. REUTERS/Navesh Chitrakar 

A demonstrator sits on the roadway during a protest against police brutality against minorities, in New York April 14, 2015. Protesters angered by fresh cases of police violence against unarmed black men in the United States gathered on Tuesday in New York City in a protest organized by the group "Stop Mass Incarceration Network" hoping to invigorate a national discussion on the thorny issue. REUTERS/Brendan McDermid

A motorcyclist dodges in the annual water-splashing festival to mark the New Year of the Dai minority in Menglian, Yunnan province April 13, 2015. Picture taken April 13, 2015. REUTERS/Wong Campion 

A woman rides a motorcycle among cars along a street in Hanoi March 30, 2015. Famous for its swarms of scooters, Vietnam is seeing auto sales surge amid the rapid expansion of a young, style-conscious middle class after 15 straight years of economic growth of over 5 percent. Picture taken on March 30, 2015. To match story VIETNAM-AUTOS/ REUTERS/Kham 

A motorist prays in church during the first gathering of motorists at the beginning of the spring season in Mirna Pec April 6, 2015. Some 7000 motorists gathered to be blessed by a priest for a safe ride in the spring. REUTERS/Srdjan Zivulovic

A motorist takes off his helmet during the first gathering of motorists at the beginning of the spring season in Mirna Pec April 6, 2015. Some 7000 motorists gathered to be blessed by a priest for a safe ride in the spring. REUTERS/Srdjan Zivulovic

A man rides a motorcycle during the first gathering of motorists at the beginning of the spring season in Mirna Pec April 6, 2015. Some 7000 motorists gathered to be blessed by a priest for a safe ride in the spring. REUTERS/Srdjan Zivulovic