16:34 - Thanks very much for joining us. See you tomorrow.
16:30 - Tomorrow it's the first stage proper, a 198-kilometre ride from Liege to Seraing. Stage 2 details
16:28 - So here's the top 10 of the prologue and of the general classification: 1. Fabian Cancellara (SUI) RadioShack 07:13; 2. Bradley Wiggins (GBR) Sky 0:00:07; 3. Sylvain Chavanel (FRA) Omega Pharma-Quickstep ; 4. Tejay van Garderen (USA) BMC 0:00:10; 5. Edvald Boasson Hagen (NOR) Sky 0:00:11; 6. Brett Lancaster (AUS) Orica GreenEdge; 7. Patrick Gretsch (DEU) Argos - Shimano 0:00:12; 8. Denis Menchov (RUS) Katusha 0:00:13; 9. Philippe Gilbert (BEL) BMC; 10 Andriy Grivko (UKR) Astana 0:00:15.
16:26 - So Cancellara wins his fourth Tour de France prologue, winning his 22nd yellow jersey in the process. That's equal to Laurent Fignon, Greg Lemond and Joop Zoetemelk and the most of all active riders.
16:24 - Evans comes in 16 seconds behind Cancellara and nine behind Wiggins.
16:23 - Cancellara was a second quicker than anyone else at the intermediate split, and he absolutely destroys Wiggins's time. The Swiss crosses the line in 7:13.46 to go seven seconds clear at the top with just Evans to come.
16:18 - Hejsedal goes over in a time of 7:31, putting him 12th. Solid start from the Giro winner.
16:17 - Evans is the only Tour winner to start this year. In 2006 there were no former winners at the start.
16:16 - Cancellara is away, as is Cadel Evans. That's all 198 riders out of the traps now. Can anyone usurp Wiggins in the next seven minutes or so?
16:14 - WIGGINS GOES TOP!! The Team Sky rider shaves 0.42 seconds off Chavanel's time as he posts 7:20.51!
16:12 - Giro D'Italia 2012 winner Ryder Hesjedal is on the road now. What can he produce in the grandest tour of them all?
16:11 - Great ride from Denis Menchov to go into the top 10 with just a few riders to go. The Russian goes sixth with a time of 7:26.
16:07 - 1.Sylvain Chavanel (Omega Pharma-QuickStep) 7:20; 2.Tejay Van Garderen (BMC) +0:03; 3.Edvald Boasson Hagen (Sky) +0:04; 4.Brett Lancaster (Orica-GreenEdge) +0:04; 5.Patrick Gretsch (Argos-Shimano) +0:05; 6.Philippe Gilbert (BMC) +0:06; 7.Andriy Grivko (Astana) +0:08; 8.Christopher Froome (Sky) +0:09; 9.Peter Velits (Omega Pharma-QuickStep) +0:10; 10.David Millar (Garmin-Sharp) +0:11.
16:06 - As bookies' favourite Brad Wiggins gets underway with real intent, let's remind ourselves how the top 10 looks right now...
16:04 - Martin has a flat tyre! A nightmare for the German! The world time trial champion is off and running on a new bike within 10 seconds or so, but his hopes of a competitive time in this time trial have gone up in smoke.
16:02 - Awful start for Frank Schleck, who come sin 114th with a time of 7:51. Right after him, Van Garderen goes second with a of 7:23!
15:58 - World time trial champion Tony Martin is the next one to go. He has won 22 UCI wins in time trials in his career (excl U23). Martin won last year’s only ITT in the Tour. After winning 9 of his 13 ITT’s last year. This year he has won 2 of 8 ITT’s, one in the Tour of Belgium and Germany’s national championship.
15:54 - Frank Schleck is off the ramp and on the streets of Liege!
15:52 - Since finishing his run which currently has him sat seventh, David Millar has tweeted: "More physical than technical course. Will be a good indicator of the GC riders form. Satisfied with how I went, no X in my factor though."
15:50 - The current top 10 is: 1.Sylvain Chavanel (Omega Pharma-QuickStep) 7:20; 2.Edvald Boasson Hagen (Sky) +0:04; 3.Brett Lancaster (Orica-GreenEdge) +0:04; 4.Philippe Gilbert (BMC) +0:06; 5.Andriy Grivko (Astana) +0:08; 6.Peter Velits (Omega Pharma-QuickStep) +0:10; 7.David Millar (Garmin-Sharp) +0:11; 8.Stephen Cummings (BMC) +0:11; 9.Jens Voigt (RadioShack-Nissan) +0:12; 10.Andreas Klöden (RadioShack-Nissan) +0:12.
15:48 - Plenty of attention on Bradley Wiggins this year. He is currently warming up as he prepares to get underway in about 20 minutes.
15:46 - Nick Nuyens is the latest of a succession of riders to finish in a frustrating 11th place with a time of 7:33.
15:41 - BMC's George Hincapie narrowly misses out on a top 10 spot, coming in 11th with a time of 7:33.
15:40 - Another popular Belgian, Maxime Monfort, gets a big sheer as he coasts over the line in 7:35, puting him 17th.
15:37 - Ivan Basso is off and running, but his pace is way of and he comes in 22 seconds behind Chavanel's leading time.
15:25 - So we are into the final hour of the Tour de France prologue, and we still have plenty of the big guns to come. Alejandro Valverde, Denis Menchov, Brad Wiggins, Michele Scarponi, Thomas Voeckler, Fabian Cancellara and Cadel Evans are all scheduled to get underway in the last 20 minutes.
15:21 - Here's the updated top 10: 1.Sylvain Chavanel (Omega Pharma-QuickStep) 7:20; 2.Edvald Boasson Hagen (Sky) +0:04; 3.Brett Lancaster (Orica-GreenEdge) +0:04; 4.Philippe Gilbert (BMC) +0:06; 5.Andriy Grivko (Astana) +0:08; 6.David Millar (Garmin-Sharp) +0:11; 7.Stephen Cummings (BMC) +0:011; 8.Jens Voigt (RadioShack-Nissan) +0:12; 9.Andreas Klöden (RadioShack-Nissan) +0:12; 10.Greg Henderson (Lotto Belisol) +0:13.
15:18 - Gilbert was only two seconds behind Chavanel at the midway check point, but he crosses the line in fourth place, five seconds behind the leader.
15:12 - And now local favourite and Belgian national time trial champion Philippe Gilbert is met by the biggest cheer of the day from the crowd as he launches down the ramp and onto the Boulevard d'Avroy.
15:09 - Another lacklustre ride from a member of Team Sky: this time Michael Rogers comes home in 7:38. Rogers crosses the line just at Pierre Rolland, last year's white jersey, sets off.
15:06 - This is the first of three stages in Belgium this year. Tomorrow the peloton rides to Seraing before going from Vide to Tournai on the French border on Monday. Here's a lovely map of the full Tour route.
15:03 - French time trial champion Chavanel's average speed in that run was 52.3km/h.
14:59 - Here we go... Sylvain Chavanel is our new leader with a time of 7:20. That's four seconds off Boassan Hagen and Lancaster's previous bests!
14:54 - Andreas Kloeden gets his Tour underway with a ride of 7:32 over the 6.4km street course, putting him seventh ahead of Hednerson and dropping Matthieu Ladagnous.
14:50 - Greg Henderson has burst into seventh in the timesheets, shunting Tyler Farrar out of the top 10.
14:47 - Here's the current top 10: 1.BOASSON HAGEN E. SKY in 07:24; 2.LANCASTER B. OGE in 07:24; 3.GRIVKO Andriy AST in 07:28; 4.MILLAR David GRS in 07:31; 5.CUMMINGS Stephen BMC in 07:31; 6.VOIGT Jens RNT in 07:32; 7.KITTEL Marcel ARG in 07:34; 8.KNEES Christian SKY in 07:34; 9.LADAGNOUS M. FDJ in 07:34; 10.FARRAR Tyler GRS in 07:34.
14:46 - Cavendish coasts home in 7:36, which puts him 13th as things stand. Didn't exactly bust a gut here.
14:42 - Cavendish has won 20 Tour stages, the most of all active riders. Cancellara is next on the list in the current peloton on 7 stage wins.
14:39 - Mark Cavendish is unleashed onto the strets of Liege. The Manx Missile said in an interview that does not expect to be as successful at the Tour de France as in previous years as he focuses on the Olympics. Cavendish commitments leave Tour de France sprints open
14:36 - Australia's Stuart O'Grady comes home in 7:36. Earlier today he tweeted: "Just said goodbye to my fresh feeling legs. This is the last few hrs they’re gonna feel good for the next 4 weeks!" - Don't pretend you don't love it, Stu!
14:33 - ... or watch in on your PC, smartphone or tablet via the Eurosport Player then I don't know what will! Subscribe to Eurosport Player
14:32 - If that doesn't convince you to either tune in and watch the action live right now on British Eurosport.... Eurosport TV guide
14:30 - There had been foreacasts of rain in Liege, but at the moment it's a nice, bright and sunny day. Some lovely aerial shots of children frolicking in fountains and the like.
14:28 - So our current top five is: 1.BOASSON HAGEN E. SKY in 07:24; 2.LANCASTER B. OGE in 07:24; 3.GRIVKO Andriy AST in 07:28; 4.MILLAR David GRS in 07:31;; 5.CUMMINGS Stephen BMC in 07:31.
14:24 - Boassan Hagen, winner of two stages last year, is our new leader! The Team Sky rider clocks in at 7:24.32, although the oficial timings are only taking whole seconds into account in their displays.
14:22 - Andre Greipel and Edvald Boassan Hagen are both set to complete their runs in the next few minutes.
14:18 - Thibaut Pinot is the next man to cros sthe line in a time of 7:37.19, steady if uninspiring from the French FDJ-BIGMAT rider.
14:15 - We have a new leader! Australia's Brett Lancaster (OGE) goes to the top of the time sheets with an 07:24, giving him a four-second margin over Grivko.
14:10 - Among the leading names off in the next hour are Mark Cavendish - he goes at 14:39, but I wouldn't expect a huge effort from him.
14:07 - Millar misses out - 7:31.62 for the Scot, who goes into second place. Britain two and three at the moment, with Stephen Cummings recording a time on 07:31 for BMC.
14:05 - Millar was reportedly sick overnight, which is far from the ideal preparation for the Tour de France.
14:00 - Millar has averaged the third overall fastest ITT in the TdF, following Greg Lemond (1989) and David Zabriskie (2005). On the 26th of July 2003 the Scottish rider averaged 54.361 km/h over 49.0 km.
14:00 - More on Millar from Infostrada: David Millar has won the opening time trial (or prologue) once before, 12 years ago, in 2000 in Futuroscope, when he beat Lance Armstrong by two seconds. That was the first of three TdF stage wins by the Scotsman, who has not emerged victorious in a TdF stage since 2003.
14:00 - David Millar has just started - will be fascinating to see how he gets on a month ahead of the Olympic Games. We are expecting the TT specialist to set the fastest time of the day so far.
13:55 - Once again, apologies for the lack of results. Here's the top five: 1-Grivko (AST) 7:28, 2-Voigt (RNT) 7:32, 3-Kittel (ARG) 7:34, 4-Knees (SKY) 7:34, 5-Farrar (GRS) 7:34.
13:50 - Here's a fascinating fact, courtesy of Infostrada Sports: The average age within the Tour 2012 peloton is above 30 for the first time since WWII. The average participant this year is 30 years and 43 days. RadioShack’s team averages 33 years and 256 days of age, the oldest team to start a Tour since WWII.
13:50 - Tyler Farrar has gone into fourth with an 07:34. Ferrar has won stages in all three Grand Tours. Winning one Tour stage, two stages in the Giro and four stages in the Vuelta.
13:50 - Our current leader Andriy Grivko tells Eurosport: "I think we could have done a lot better - there were another 15 seconds out there."
13:45 - Betting fans might be interested in the odds for today's Prologue: Fabian Cancellara 6/4, Tony Martin 9/2, Bradley Wiggins 5/1, Peter Sagan 7/1, David Millar 25/1, 50/1 bar.
13:40 - Second place for Marcel Vittel, six seconds off the pace in 07:34, and Christian Knees goes third a few hundredths further back.
13:40 - For web users, here's a picture of Andriy Grivko crossing the finish line. Tyler Farrar is now on the course. Grivko crosses the line
13:35 - Apparently Cadel Evans will not be wearing a yellow jersey today, as he has the right to do as last year's GC winner. He thinks it is not aerodynamic!
13:30 - Apologies for the technical problems with our flashy new live widget. You'll notice it isn't working. Our engineers are on the case and trying to fix it.
13:25 - How they stand: 1-Andriy Grivko 07:28, 2-Vasili Kiryienka +10", 3-Simon Gerrars +14", 4-M Tjallingii +15", 5-Jan Ghyselinck +16", 6-Bernhard Eisel +17".
13:20 - The race is now live on British Eurosport, with the ever-excellent James Richardson at the helm. Watch Eurosport Player!
13:15 - Sky stalwart Bernhard Eisel has just gone off. Also in the next group of riders, South Africa's Robbie Hunter and Yaroslav Popovych.
13:12 - Good effort from Grivko, who shaves 14 seconds off Veelers' time. Not a bad time triallist, the Ukrainian. He was third on the Dauphine prologue earlier this month.
13:08 - First man home! Tom Veelers, in 07:42, though Andriy Grivko is already eight seconds up at the half-way split.
13:05 - The first 10 riders: 1-Tom Veelers (ARG), 2-Simon Gerrars (OGE), 3-Martin Velits (OPQ), 4-Andriy Grivko (AST), 5-Anders Lund (STB), 6-Vasili Kiryenka (MOV), 7-Maarten Tjallingii (RAB), 8-Cedric Pineau (FDJ), 9-Aliaksandr Kuchynski (KAT), 10-Johnny Hoogerland (VCD)
13:00 - C'est parti! The 2012 Tour de France is under way! The Dutchman Tom Veelers is the first man off. It's a pretty much flat course with a few tricky hairpins. And, at 6.4km, pretty short.
12:55 - Other notables to look out for: David Millar 13:59 UK time, Mark Cavendish at 14:39, Denis Menchov 16:04, Peter Sagan 16:50, Tony Martin 16:58, Vincenzo Nibali 16:12.
12:50 - We are in Belgium for the opening stage, a 6.4km time trial through the streets of Liege. Tom Veelers of the Argos Shimano team has the honour of getting us under way. The big boys come later - Bradley Wiggins goes at 16:07 UK time, time trial favourite Fabian Cancellara at 16:16 and defending champion Cadel Evans at 16:17.
12:45 - Hello and welcome to our 2012 Tour de France coverage!