Russia treadspublished at 13:05 British Summer Time 28 September 2019

Race live on 5 Live and Sport website Sunday at 12:10 BST
Leclerc takes fourth pole in a row, Hamilton 2nd
Albon crashes heavily, Kvyat did not take part
Niamh Lewis and Matt Warwick
Q1
Both Ferraris are out on the mediums.
Mercedes typically have had success here. Vettel broke that streak in 2017 when he took pole. Can he do it again?
Leclerc, Vettel, Verstappen, Bottas?
Or is this the race where Lewis Hamilton will pull out a stunning qualifying lap?
Tell us! #bbcf1
Singapore was the first time since 2008 Ferrari had won three consecutive races.
That's a big dry patch.
Ferrari have six poles out of 15 races so far this year... and Mercedes have eight. To make 15, Max Verstappen has one.
The showers have passed!
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BBC Radio 5 Live Sports Extra
Claire, Jack, Jolyon, and Andrew will be back at 12:55 BST on BBC Radio 5 live sports extra and at the top of the page.
George Russell and Alex Albon have had some success here recently... in Formula 2 last year.
Albon won the F2 feature race, and Russell won the sprint race.
Andrew Benson
BBC Sport’s chief F1 writer
It would be wrong to say these are troubling times for Mercedes, as their leads in both drivers’ and constructors’ championships are pretty much impregnable.
But Friday in Sochi continued the impression that there has been a dramatic shift in the competitive order in Formula 1.
After three consecutive Ferrari wins, on circuits at opposite ends of the F1 spectrum, this one, different again, was always going to provide another piece in the jigsaw. And Mercedes were clearly struggling.
Lewis Hamilton described Friday as “a day of discovery” and added: “We’re losing 0.8secs or something to the Ferraris on the straights.
"We have just been trying to figure out how to improve the car, but it’s not an easy task.”
Russia is sooooooooo big it has 11 time zones. But the only time you need to know about today is that qualifying starts in 30 minutes at 13:00 BST.
Nico Rosberg has the most, but this graphic sums up Russia's history on the F1 calendar, so he's not exactly storming ahead.
McLaren have a deal to use Mercedes engines from 2021 until at least 2024...
Mercedes have won the Constructors' championship every year since 2014...
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Here's Max Verstappen's spin from earlier...
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Russia's Daniil Kvyat has had a weekend to forget so far.
We know he will start at the back of the grid, no matter what happens in qualifying, but let's hope he at least gets a few competitive laps out of his Toro Rosso.
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Andrew Benson
BBC Sport’s chief F1 writer
What was wrong with Mercedes? Well, part of the problem was their straight-line deficit to Ferrari, a combination of a more powerful engine and less drag on the Italian car.
But that did not explain the 0.6secs gap to Red Bull’s Max Verstappen in second practice on Friday.
Mercedes technical director James Allison said: “That was mostly a difficult day but with some bright moments in it that give us hope that we can do a good job tomorrow and on Sunday.
"We're quite clearly a little bit out of step with the other teams in terms of our first lap performance on a track where we've traditionally found it a bit difficult to get the front tyres to the temperature we need them.
"But we made some decent learning steps during the day and if we carry on in that direction, then things should look brighter tomorrow.
"We're also quite reassured by the fact that on high fuel and when the first lap is taken out of the picture, the car looks swift and looks like it will be a good racing car.
"There's definitely a load of work for us still to do, but hopefully we can get that done well and put the frustrations of today behind us and retain the good bits that we saw.”
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Sunshine, blue sky, dark clouds, light clouds...this could be one of Carol Kirkwood's weather forecasts for a typical British summer's day.
Basically, all options are open...
Claret & Blue Pixels: I think it needs opening up to give more young talent a chance in F1 machinery Rip up the concorde agreement, get rid of the daft new teams fee and try to encourage the best of the junior teams in lower formulae to make the step up In other words, bring back 26 car grids
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