Rivals agree: 20-race calendar is ideal

Rival team bosses have backed Ron Dennis's call for a maximum number of 20 grands prix per season.

Speaking earlier this week Dennis said that although he welcomes F1's current expansion into new countries, he believes the season should never be expanded "to more than 20 grands prix."

This is a sentiment echoed by his fellow team bosses with Red Bull's Christian Horner agreeing that 20 races is the ideal length for a grand prix season.

"I think 20 races is a big number but a sensible number," he said.

"It's a huge logistical challenge but the way the teams are working with each other to self-regulate testing it is possible."

Honda CEO Nick Fry added: "I think 20 grands prix is about right. The balance of traditional circuits in Europe and circuits in new continents is vital.

"F1 needs to go where the commercial market is and that market is moving from Europe and North America to the Middle East and Asia."

This year's calendar sees the addition of two new venues with a European GP being held in Valencia and Singapore playing host to F1's first ever night races.