Adam Yates under waypublished at 15:22 British Summer Time
Leading time: Luke Plapp - 24mins 58secs
We're now into the top 30 of the GC standings, and UAE's British rider Adam Yates is the latest to set off.
Stage 13 guide - 10.9km mountain time trial from Loudenvielle to Peyragudes
Tadej Pogacar wins by 36 seconds to claim fourth stage victory this year
Reigning champion stretches lead over Jonas Vingegaard to more than four minutes
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Written by Ben Collins
Leading time: Luke Plapp - 24mins 58secs
We're now into the top 30 of the GC standings, and UAE's British rider Adam Yates is the latest to set off.
Leading time: Luke Plapp - 24mins 58secs
Wout van Aert has won two time trials on the Tour but he won't be adding to that tally this year.
The versatile Belgian star was never in contention, although he actually improved over the third and final sector to finish 3mins 5secs slower than Luke Plapp - 21st quickest so far.
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Tadej Pogacar's winning margin yesterday was the biggest of his 20 stage wins and he now leads the race by 3mins 31secs.
Will Jonas Vingegaard be able to close that gap or is Pogacar already destined for a fourth Tour win?
Let us know your thoughts via the usual channels listed above... or hit thumbs up if you think the race is already over, thumbs down if it's still alive.
Leading time: Luke Plapp - 24mins 58secs
Mathieu van der Poel has had an eventful race, claiming his second stage win and wearing the yellow jersey.
The versatile Dutch star is now third in the battle for the green jersey - behind Jonathan Milan and Tadej Pogacar - and has just left the start ramp.
Leading time: Luke Plapp - 24mins 58secs
On his 14th and final Tour, Geraint Thomas' final time trial sees the 2018 Tour winner cross the line 3mins 30secs slower than Luke Plapp.
Leading time: Luke Plapp - 24mins 58secs
The clock goes red as Bruno Armirail climbs to the line.
He eventually crosses 74 seconds slower than Luke Plapp, which puts him behind Julian Alaphilippe in fourth.
Leading time: Luke Plapp - 24mins 58secs
Bruno Armirail is third quickest at the second and final time-check, 3.3km from the line, 21 seconds slower than Luke Plapp.
Geraint Thomas is almost two minutes adrift.
Rumour has it that Tadej Pogacar has opted for an aero road bike, with no paint!
That's the kind of measures teams are taking to make their bike as light and as quick as possible.
Jonas Vingegaard, meanwhile, is going for a matt black time-trial bike, while his Visma team-mates are on road bikes.
Leading time: Luke Plapp - 24mins 58secs
Tudor's French rider Julian Alaphilippe goes third quickest, 64 seconds slower than Luke Plapp.
Leading time: Luke Plapp - 24mins 58secs
Bruno Armirail was the final breakaway rider to be caught by Tadej Pogacar on the Hautacam climb yesterday, and the Frenchman's made a flying start to his run.
Geraint Thomas is also on the course right now.
The 2023 time trial was a hilly course and Tadej Pogacar was one of several riders to switch to a lighter road bike for the main climb.
It cost him about 10 seconds but the idea was he'd make up that time - and much more - on the climb.
The switch did not pay off but the time that Pogacar lost was only a fraction of the margin of victory for Jonas Vingegaard, who stayed on his time-trial bike.
This time trial finishes with an even steeper climb so who - if anyone - will opt to swap bikes today?
Tadej Pogacar not only regained the race lead yesterday but now has an advantage of 3mins 31secs over his closest rival Jonas Vingegaard.
Pogacar's winning margin of 2min 10secs was the biggest from his 20 stage wins.
But Vingegaard will take heart from stage 18 in 2023, the only time trial of that year's Tour.
The Dane produced a stunning performance to not only beat Tadej Pogacar but went 1min 38secs quicker than the Slovenian - and 2min 51secs better than his team-mate Wout van Aert in third.
Romain Bardet won at Peyragudes when a stage finished there during the 2017 Tour. That one wasn't a time trail, but the recently-retired Frenchman spoke to TNT Sports about that finish.
"The last part could be a climb in itself," he said. "It's so steep and so wide.
"The guys will have to push before that, for more than 20 minutes, but you have to keep something in reserve for the finish. It keeps climbing and climbing, and requires a lot of muscle strength because you are suffering and you have to keep going. There is no chance you can change position to get more speed. It's brutal.
"If you go a bit too deep on the bottom of the climb then you can really pay the price. In 2017, it was a different kind of racing but over the last 300 metres, some guys lost more than 20 seconds. It can mean winning or losing, the way you climb in the last 300 metres."
Former Tour rider Romain Bardet did a ride-through of today's course for TNT Sports and as he described it, you turn the final corner to be met with "a wall" as you look towards the finish.
It really is terrifying!! I'm hoping a better image lands to demonstrate it but I'm afraid you'll have to make do with this for now.
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Thanks to Steven for contacting us on WhatsApp. He sent a graph showing the profile of that climb to the finish line at the Peyragudes airfield, which Lenny Martinez has just dragged himself up.
He said simply: "A much better illustration of today's stage."
You're absolutely right Steven!!
Leading time: Luke Plapp - 24mins 58secs
Lenny Martinez was going well there, until he hit that final climb.
Many riders today will think they're on course to set the quickest time but that hope will evaporate as they battle to the line, as Martinez just found it.
It took the young Bahrain Victorious rider almost two minutes to complete the final 200m and his time was 23 seconds slower than Plapp's to go second overall.
Leading time: Luke Plapp - 24mins 58secs
Cofidis rider Bryan Coquard came in about five minutes slower than Luke Plapp and the Frenchman waved farewell at the finish line.
He stopped for treatment on a hand injury during yesterday's stage and will now abandon the Tour to undergo surgery.
Here's a reminder of what the coloured jerseys mean:
Tadej Pogacar not only regained the overall race lead yesterday, he replaced Lenny Martinez at the top of the King of the Mountain standings. But since the yellow jersey takes precedence, Martinez will again wear the polka dot jersey today:
Since Tadej Pogacar's first Tour in 2020, only he, Remco Evenepoel and Wout van Aert have won multiple time trials on the Tour:
2020
2021
2022
2023
2024
2025