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The switch from Bridgestone to Michelin as the official tire supplier for MotoGP promises to be perhaps the most important change to the class for 2016, though the change to spec-ECU software runs it a close second.

Up until the Valencia tests, held after the final race of the year, the performance of the Michelins was still shrouded in mystery, the official riders contractually obliged to keep quiet about the French tires while Bridgestone was still the official tire supplier.

That all changed on the Tuesday after Valencia. With the handover to Michelin, the riders were free to speak, as were the principal players inside the French tire manufacturer.

The teams had a lot of work to do, their job not made any easier by the fact that so many riders crashed at Valencia. Riding styles needed to change, as did the weight distribution of the bikes.

But question marks remained over the performance of the Michelin front tire, especially, with so many riders lowsiding over the two days of the test.

On the Tuesday at Valencia, we got a chance to speak with Nicolas Goubert, the head of Michelin’s motorsports program, alongside Israeli TV5 commentator Tammy Gorali.

Goubert gave an update on the progress of their MotoGP program so far, and addressed several of the issues they had faced during testing. Of course, Michelin was delighted to be back in the premier class again.

We are creatures of habit in the paddock. After having had our biorhythms put out of whack by a wild and weird Thursday, having bikes on the track on Friday brought us all back into line, and restored a sense of normality to MotoGP.

This was a race weekend once again, and the arguments and backbiting have been put aside for a moment.

Though the return of racing motorcycles going fast around a circuit brought some joy back to the paddock, the day was also tinged with sadness. Two events punctuated the day, celebrating two mighty monuments of the paddock, who depart for pastures new.

At lunchtime, Nicky Hayden was inducted as a MotoGP Legend, with a ceremony and a brief press conference. In the evening, Bridgestone held an official soiree to take their leave of the paddock, as they ended their role of official tire supplier.

Though the riders competing in the 2015 MotoGP championship have all departed, the factories stayed on at Sepang for another day of testing. For the fourth day of the first Sepang MotoGP test was designated as a test day for Michelin, who are due to take over as official tire supplier from 2016.

The legal complications of the change from Bridgestone to Michelin mean that the tire test is shrouded in confidentiality, rather than secrecy. This test features only the test riders, all of whom have been barred from talking to the press about the tires.

Times were not recorded, and definitely not released, though a handful of hardy journalists stood at trackside with handheld stopwatches (or smartphones) and tried to time riders that way.

Dunlop is set to continue as single tire supplier to the Moto2 and Moto3 classes. In a press release (shown below), Dorna announced that they have extended the current contract with Dunlop to remain as the spec-tire supplier to the support classes, for the 2015 season and beyond.

The press release does not make any mention of the duration of the contract, stating only that Dunlop will continue “from the start of 2015”.

Dunlop has been the spec tire supplier to both Moto2 and Moto3 since the introduction of the two classes, in 2010 and 2012 respectively. The announcement that they are to continue signals that both series will continue with a spec tire for the foreseeable future.

However, the intermediate classes had been a de facto spec series for a long time, with Dunlop supplying almost the entire field in the 250cc and 125cc classes which preceded Moto2 and Moto3.

World Superbike’s spec-tire contract with Pirelli comes to a conclusion after the 2015 season, and as such the Dorna WSBK Organization, in agreement with the FIM, has announced that it is taking bids from companies who are willing to be the sole-tire supplier of the World Superbike Championship from 2016 onwards. Interested parties will have to contact Gregorio Lavilla, the WSBK Sporting Director, and have their offers in by August 25th.

The tire allocation for MotoGP is set to be expanded when the new tire supplier takes over from 2016. The numbers of tires supplied to each rider will be increased by one or two tires per rider, and each rider will have the option of three different compounds front and rear.

But perhaps the most welcome change will be the return of intermediate tires to MotoGP, for use in practice conditions which are too dry for rain tires, but too damp and dangerous for slick tires to be used.

Bridgestone have announced that they will not continue as MotoGP tire supplier after the 2015 season. The Japanese tire maker will continue for the remainder of this season and throughout 2015 before pulling out of MotoGP.

The move had been expected. Spanish magazine Motociclismo reported two weeks ago that Bridgestone was on the brink of withdrawing, which we covered at the time.

There had been growing dissatisfaction between the two parties over the past couple of years, with Bridgestone not feeling they were getting the exposure they needed for the 20 million euros they spend on the series, while Dorna felt that the tires were not contributing to the spectacle of racing, and were built so conservatively in terms of tire durability that they were occasionally unsafe.

At Austin, the first murmurings of the growing rift became audible. Paddock rumor held that Bridgestone, whose contract was due to expire at the end of 2014, had agreed a single year’s extension to the end of 2015 to allow other tire suppliers time to develop their tires for MotoGP.

With new technical regulations due to take effect from 2016 – all teams will use the spec ECU hardware and software from that point on – starting a new contract period from 2016 makes sense.

Who will take over as single tire supplier is as yet unknown, but that it will be a single supplier is certain. IRTA, representing the teams, is a big supporter of the single tire supplier, because of the cost savings for the private teams.

Big changes look to be coming to MotoGP’s spec-tire system. Now in the sixth season of having a single official supplier, MotoGP is moving closer to seeing the number and variety of tires drastically expanded. With the contract with Bridgestone due to expire at the end of 2014, there is even a serious chance that a new manufacturer could take over from the Japanese tire firm.

A report in the latest issue of the Spanish magazine Motociclismo (available via the Zinio platform), the magazine is reporting that Dorna is looking to change the way that the single tire supply works. Dorna representative Javier Alonso told Motociclismo that negotiations had been opened with several suppliers, including Michelin, Pirelli and Dunlop, as well as current supplier Bridgestone.

Dorna had presented Bridgestone with a list of conditions drawn up by the Safety Commission, the liaison body in which the riders discuss safety issues with representatives of Dorna, hosted by safety officer Loris Capirossi.

Though Alonso does not explicitly name the conditions, he does give Motociclismo some context behind their thinking. The idea is to expand the range of tires available at each race, as it has been all too common in recent history for riders to turn up at a particular track only to find that just one of the two compounds available will work.

After every race weekend, Bridgestone issues a press release containing a summary of how they think their weekend went. Normally, they are fairly bland affairs, only of interest to those interested in the minutiae of tire performance and setup. How different is the press release issued after the Australian Grand Prix.

After the debacle of tires not being able to complete an entire race, and compulsory pit stops introduced, Bridgestone’s press release was highly anticipated.

The press release itself is rather disappointing. While the technical details are fascinating on why the tires failed to hold up at Phillip Island, the question of why Bridgestone failed to test at the circuit is merely skimmed over in passing references. The full press release appears after the jump.