Opponents question methods behind British results on the track

After four years of being cannon fodder, Great Britain is again the nation firing the shots in Olympic track cycling.

And a lot of people are wondering how they've done it this time.

Repeating their domination at Beijing and London, the British own the Rio velodrome as well.

Mark Cavendish' silver in the omnium takes their haul to four gold and three silvers from seven of the 10 events.

No other nation has won more than one gold medal and Australian cycling's Olympics of great expectations is stalled on a silver and a bronze.

Heading into the last day, Laura Trott leads the omnium, Rebecca James is favourite in the sprint and Jason Kenny will be tough to beat in the keirin.

German sprint star Kristina Vogel bluntly admitted she finds it "very questionable".

"They were cannon fodder when you look at the last few years. Now they come along with a (high) level," she said.

"I don't want to accuse anyone of anything but it is all very questionable."

Australian great Anna Meares is also perplexed.

"The British are just phenomenal when it comes to the Olympics," she said.

"We're all just scratching our heads, going 'how do they lift so much?' when in so many events they haven't even been in contention at the world championships," she said.

"It's been tough, because you come in here with hopes and you come in here with great performances at world level for a number of years.

"Then at the Olympics, it seems like you're just not in competition with that nation.

"They have it together and to be honest, I'm not exactly sure what it is that they have together."

But fellow Australian Glenn O'Shea said the British cyclists were always going to be a force in Rio.

"If you sit down and actually look at their performances, Great Britain, you can see they were coming for the Olympics ... it's all there," he said.

"They were always going to come out, they were always going to be good."