All Peter Sagan has to do to win his fifth successive green points jersey is make it to the finish in Paris on Sunday.

The Slovak is not troubling the podium today, not that he was expected to. He finished in 34 minutes, 28 seconds, two minutes 42 seconds behind the current leader.

Fancy cycling up a hill like these guys today?

Let British Cycling show you the right exercises to use to work the upper body and trunk - just as you will when you're climbing a hill....  

Come on Jack, spill the beans...we need time and distance

#bbccycling

15:59 Chris Froome GB/Team Sky 77hrs 25mins 10secs

15:56 Bauke Mollema Ned/Trek +2mins 27secs

15:53 Adam Yates GB/Orica =2mins, 53secs

15:50 Nairo Quintana Col/Movistar +3mins 27secs 

15:47 Romain Bardet Fra/AG2R +4mins 15secs

15:44 Richie Porte Aus/BMC +4mins 27secs

15:41 Alejandro Valverde Spa/Movistar +5mins 19secs

15:38 Fabio Aru Ita/Astana 5mins 35secs

15:35 Dan Martin Ire/Etixx - QuickStep 5mins 50secs

Chapeau Alex #bbccycling

Of the 198 riders who left Mont-Saint-Michel almost three weeks ago, there are still 179 riders pedalling.

Ireland's Sam Bennett was first down the ramp at 09:45 BST and he started the day four, hours, 10 minutes, two seconds adrift of Chris Froome. He is about 15 minutes slower than the second-last - Lars Bak and could, therefore, be hot favourite to win the Lanterne Rouge.

The prize for being the slowest man to complete the race has seen intense battles in previous editions with riders figuring people are more likely to remember the man who finished last, over the man who finished second-to-last. 

Lanterne Rouge comes from the French for Red Lantern and refers to the red light on the back of a train.

Bennett, who you may recall, had a nasty crash on stage one, stopped the clock at 36 minutes, 47 seconds and will remain last for one more day, at least.

Image source, Getty Images

Wow Josh, not quite what I was expecting first up...hope the recovery going well.

#bbccycling for your time trial experiences, or to let us know how many seconds Chris Froome will gain, if any, on his rivals for yellow today.

This leaderboard will change numerous times over the next couple of hours, but the current leader is France's Jerome Coppel.

There has been much debate over whether riders will favour a time trial bike over their normal Tour bike for today's stage. Pre-race, Geraint Thomas told me that he would probably look at time trial bars on a road bike, and that looks exactly what the Welshman has gone for (bike nine below).

However, Doctor Hutch - a former British time trial specialist, later had a sneaky peak at Chris Froome's machine for today...

The rainbow jersey bands of world time trial champion are being worn by Team Sky's Vasil Kiryienka. The Belarusian was the surprise winner of the title last September in Virginia.

He only gets to wear the jersey when he is competing in a time trial and because he is one of Chris Froome's key domestiques, he is well down the overall standings and has already completed his time trial.

No heroics today from Kiryienka who stops the clock at 35 minutes, 51 seconds, which is 3mins 14secs slower than current leader Nicolas Edet.

One suspects the Belarusian is keeping a bit back with two big days in the Alps to follow.

So, I want your personal time trial highs and lows today. Have you set a personal best this year? Were you on-course for something special only for a mechanical to derail you?

Or maybe you were like Andy Birdsall, who found himself to be the man setting off one minute ahead of Sir Bradley Wiggins in a low-key 10-mile time trial last year.

Birdsall stayed ahead for four minutes, 33 seconds, before the Olympic time trial champion, who was preparing for his tilt at the world hour record, passed him.

#bbccycling for your best, and worse stories. 

And if time trialling is not your thing, let me know your stage winner and by how many seconds Froome will extend his advantage, if at all.

BBC Radio 5 live's OJ Borg has ridden today's stage, while expert summariser Rob Hayles chose to give us his thoughts instead.

Today's stage may only be 17km but the undulating road means "it's difficult to find a good rhythm", says Hayles, who adds, there won't be much time gained on the descent but "if you get it wrong you could lose absolutely everything".

You can listen to Hayles and Rob Hatch from 15:00 BST through this very webpage.

If you are reading via the BBC Sport mobile app you will need to click on the link to watch the clip.

Today is all about the 'race of truth'. Man and bike against the clock. No support riders. No drafting behind a car. No sheltering or on the wheel of a team-mate.

And it's up a mountain. A touch shy of 700m in elevation from the start in Sallanches to the highest point of the stage, the Cote de Chozeaux, before a 2km downhill section to the finish in Megeve.

The Tour de France likes honouring its past winners and today is no exception with Bernard Hinault's 1980 road race world title getting the treatment.

Hinault, a five-time Tour winner and the last victorious Frenchman, in 1985, attacked on the Cote de Domancy - an ascent tackled 20 times during the race - going on to win by more than one minute.

Image source, Tour de France

The riders go in reverse order so race leader Chris Froome will be the last man down the ramp today at 15:59 BST.

Adam Yates, the Briton surprising everyone in third, will go out six minutes before Froome with the man in second, Bauke Mollema splitting them.

So we've got just under three hours to wait until Team Sky's best rider clips in and sets off.

Hello, and welcome to live text and radio commentary of stage 18 of the 2016 Tour de France.

Just four stages remain for Chris Froome to defend the race lead and win a staggering third edition of this grand old race.

Just have a think about that for a minute. 

A British rider is on the verge of winning a third Tour de France, to make it four in five years after Sir Bradley Wiggins' breaking the door down triumph in 2012.

When I did my first live text commentary on the Tour at some point in the middle of the last decade, a British stage winner was cause enough to celebrate.

This year alone we've had six stage wins to savour, we've got the man in yellow, the man in white and first and third on the podium.

Image source, Getty Images