Nico Roserg also seems to be having similar problems to Lewis Hamilton with his rear tyres. He comes into pit - he's in P17.

Claire Cottingham
BBC Radio 5 live pit-lane reporter

The rear wheels are the problem for Hamilton. he's still sat in the car. Marcus Ericsson said his Sauber was undriveable, but his team don't know what the problem is yet.

Tom Williams: Massa to Renault, Button to Williams, Vandorne in at McLaren and Perez to Ferrari with Kimi retiring.

Allan McNish
BBC Radio 5 live Formula 1 analyst

Hamilton's tyres are blistering. The compound has got too hot and it's popped little bubbles. The tyre is past its best and hasn't got any more grip.

"Take a look at my rears something is not right," Hamilton tells Mercedes on the radio.

He's asked to do a couple more laps...

"I'm going to go off if I keep on going," is the curt reply.

It seems Ferrari are trying out qualifying runs, while Mercedes are perhaps looking at race simulations.

Lewis Hamilton's having a wobble though - there are issues with his tyres.

Marcus Ericsson comes on the radio.

"The car is undriveable. Something is wrong."

Max Verstappen, on ultra softs, leaps above Kimi into P2, only to see the Finn retake the position with a 1:07.6.

Meanwhile, Sebastian Vettel comes in to pit.

And Ferrari don't mess around.

Sebastian Vettel goes into P1 with a 1:07.307 - Raikkonen narrowly behind.

Murry Ren: Kimi must up his game asap if he is to retain the red seat. F1 needs the Iceman. #BBCF1

In contrast, Kimi Raikkonen is given super softs as he creeps out, but team-mate Sebastian Vettel has the ultras.

Lewis Hamilton goes for a couple of laps on the ultra soft tyres - he then pits with a time that puts him in P7.

Here we go then, last chance to find your limits before qualifying.

You can listen on this page by clicking the Live Coverage tab.

Andrew Benson
Chief F1 writer

Image source, Getty Images

Max Verstappen broke his front wing when he ran wide in first practice and hit one of the new yellow kerbs. He criticised them as “dangerous" but got himself into a bit of a logical pickle by doing so. "The problem is," he said, "I understand we have to respect the track limits, but it’s better to put a wall there then, because, I mean, I destroyed two front wings and a front suspension." He seemed to have forgotten that if there had been a wall there and he’d hit it, he’d have damaged more than a front wing end-plate and a track rod. 

Anyway, most of the other drivers shared the view of the FIA, that the kerbs were well off the track - three metres to be precise - and it was better just to avoid them. As Verstappen’s team-mate Daniel Ricciardo put it: "It's not personal to Max, but I do like that if you make a mistake you can't just continue like it's nothing. I don't think they're dangerous, I actually think they are quite good. You're going off track and at least you're paying a penalty."

Mark McCallum: Raikkonen out. Sainz to replace him. Button to Williams.

Image source, AFP

Lewis Hamilton might be the defending world champion, but that hasn't stopped Max Verstappen getting all up in his grill.

The Dutchman has accused Hamilton of hypocrisy over safety in F1.

The 18-year-old accused Hamilton of "maybe wanting to be cool" by giving the impression he is not that interested in safety, but acting differently in private.

Max is certainly not afraid of reputations.

What do you make of it all? use #bbcf1 to give us your thoughts.

To follow on from that, Sebastian Vettel's five-place grid penalty for a gear-box change was confirmed last night.

And we're just hearing that both Ferrari's have used a token for an engine upgrade.

Andrew Benson
Chief F1 writer

Image source, Getty Images

Can Ferrari challenge this weekend? It didn’t look that way on Friday. Sebastian Vettel was 0.6secs off the Mercedes, who looked very, very fast on one lap, and Ferrari again had a messy day, both drivers going off track, Vettel for good right at the end of the session caught out by what he said was "a problem with the brake distribution". But the four-time champion sounded optimistic. "It was a decent day," Vettel said. "The car felt good. Not entirely clear where we are. We didn’t have much running. But it should be OK.”

So, here's the forecast for Graz Airport today, which is about 50 miles away from Spielberg.