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Vintage racers know all to well the difficulty there can be when it comes to finding appropriate tires for the race track, as the odd rim sizes of classic motorcycles are often outside the sizing parameters of good modern sticky tires.

This leaves many racers using street-focused tires for their racing needs, but that could all come to an end, as Metzeler is expanding its Racetec RR Range to include 18-inch wheel sizes.

Can part two of the (melo)drama that is the 2017 MotoGP season live up to part one? It has been a wild ride so far, but like any great fairground ride, we have ended up more or less back where we started.

Just five points separate Marc Márquez and Maverick Viñales at the top of the championship, and Valentino Rossi in fourth is only ten points behind Márquez, with Andrea Dovizioso in between, a point behind Viñales.

If Márquez does not win the Czech Grand Prix at Brno on Sunday, there is every chance the championship will have a new leader. If there is, it would be the fifth time the title lead had changed hands so far this year. It has been a wild ride indeed.

So how did we get here? Through a mixture of rider swaps, tire changes, weird weather, and changing track conditions. Add in a healthy dose of spec electronics, the loss of winglets for this season, and a brace of astonishing rookies, and you have an explosive mixture.

At Mugello, perhaps the nearest thing we have had to a normal MotoGP weekend this year, the gap from the winner, Andrea Dovizioso, to Jack Miller in fifteenth was 30.7 seconds, with 50 seconds covering all 20 finishers.

In 2015, 30 seconds covered just the first eight riders. In 2013, only five other bikes finished within half a minute of the winner. Those kinds of gaps have been the rule for most of the modern era. But the old rules no longer apply.

Michelin can take much of the credit, or shoulder much of the blame, depending on your perspective. In their second year back in MotoGP, the French tire manufacturer have been a much more stable force in the series, the tires changing less this year than in 2016.

But that has not stemmed the complaints: there have been a string of riders muttering that the Michelins are not up to scratch, that they change too much from one race to the next, and even from one day to the next.

Are their concerns valid? Michelin deny it, of course, and give a long list of entirely plausible reasons for the tires to react differently from day to day.

Motorcycle manufacturers may be abandoning the 600cc sport bike class, but the folks at Dunlop are continuing to provide support to supersport riders on the track, with a new KR451 slick tire.

For those who don’t know, the Dunlop KR451 slick tire has been the spec-tire for the MotoAmerica Supersport classes, in a 180/55 R17 configuration for the rear wheel.

Choosing now to develop the race tire specifically for supersport riders, Dunlop is releasing the KR451 to fit the 5.5-inch rim used on modern supersports. This has lead to the creation of a 180/60 R17 rear tire size for the new KR451 slick – in soft and medium compounds.

If the 2017 MotoGP season has been anything, it has been entirely unpredictable. After two races, we were declaring the season over, and penciling Maverick Viñales’ name on the trophy.

A race later, and we were conceding that Valentino Rossi had taken over the lead of the championship, and that meant that whoever won the title would be riding a Yamaha.

After four races the top four were within ten points, and we gave up on there being a favorite, only to change our minds again after Le Mans, where Valentino Rossi crashed out trying to beat his teammate, and Viñales took a 17-point lead again.

After Mugello, when Andrea Dovizioso won his first dry MotoGP race, Viñales led by 26 points, and was ahead of reigning champion Marc Márquez by 37 points. We had our favorite once again.

Three races and two changes in the championship lead later, and we have given up again. The top four are back within ten points of each other again, and making predictions is looking increasingly foolish.

There was one certainty we could cling to, and would not allow ourselves to let go: At the Sachsenring, Marc Márquez takes pole, and then goes on to win the race.

It has happened the last seven years Márquez has raced at the Sachsenring, from 125s to Moto2 to MotoGP. Surely he would repeat that again? Surely, Marc Márquez would break the unpredictability of MotoGP in 2017?

Well, we knew the weather was going to be a factor at the Sachsenring, and we weren’t disappointed. (Or perhaps we were, depending on your point of view.)

The MotoGP riders started off on a bone dry track in the morning, spent an extended 55 minutes on slick tires, then suffered through a couple of full on rain showers in the afternoon. They had time on a dry track, and time on a wet track, and time on a track with a dry line forming.

It was the perfect preparation for what promises to be a weekend of mixed weather. The chances of making it all the way to the race on Sunday without another wet session are very small. But they are also not zero.

Riding in both weather conditions gave the riders a chance to assess the grip of the new surface. The response was overwhelmingly positive. Aleix Espargaro summed up the general impressions, and entirely in character, he also summed it up with the most enthusiasm.

“It’s unbelievable,” the Aprilia rider said. “They did a super job, a fantastic job. The tarmac has zero bumps, nowhere. The grip is super high. Actually, I think we finished five seconds from the dry times, which is very very very fast. So, German style, they did a great job!”

The grip was generally judged to be good in the dry, but absolutely phenomenal in the wet. “Honestly, in the wet you can’t believe it,” Cal Crutchlow told us.

“I left the pit lane. I was late because we were messing around in the garage. Marc had done three laps. I saw the blue flags, sit up and I looked down and Marc’s got his elbow on the floor! When I see someone’s got their elbow on the floor it means you’ve got to push.”

From Assen to Sachsenring, 700 kilometers in 7 days. One of the shorter hauls between back-to-back races, but a tight schedule nonetheless.

Sachsenring’s weird split paddock was full of tired looking faces on Thursday, as truck drivers and hospitality staff rushed to tear the entire paddock down in Drenthe, then build it all up again in Saxony.

It is hard to think of a greater contrast in circuits, too. Assen is flat, fast, and sweeping, the Sachsenring tight, slow, and with massive changes in elevation. There are similarities too: the bikes spend a lot of time on the edge of the tire at both tracks.

At Assen, it’s especially the right side of the tire, as riders sweep through the succession of right-handers from Mandeveen all the way to the Ramshoek.

At the Sachsenring, it’s all left-hand side of the tire which takes the punishment, as the bikes come out of the Omegakurve, pitch into Turn 4, then hustle their way all the way down and then up and over the hill before Turn 11.

Turn 11 is a vicious beast, laying in wait for the unwary, its voracious gravel trap waiting to claim anyone who flicks the bike just a little too enthusiastically right after spending so much time on the left-hand side of the tire.

The opposite right-hand side has had 40 seconds to cool off, while the right-hand side of the tire takes all the punishment. The transition from left to right, from scorching hot to cool rubber, from one of the hardest tire compounds of the year to one of the softest, is tricky.

Switching between two very different feeling rubbers catches plenty of riders out, in both MotoGP and Moto2.

The Misano round of WorldSBK was dominated by talk of tires. As such, following a weekend fraught with failures, Pirelli will revert to an older specification of tire for the Laguna Seca round. The move sees Pirelli at a crossroads, after a series of high profile incidents during the scorching weekend in Italy.

This includes Michael van der Mark’s crash from the lead of Saturday’s race, after a tire failure saw the Dutch rider robbed of his chance to claim his first podium for Yamaha.

One has to remember too, Jonathan Rea also crashed out of the lead at the previous round in Donington Park, as it was a shock to see the previously robust Pirelli fail once again.

Why go testing on Monday after a race? Even though riders are pretty drained after a full race weekend, riding on Monday provides really useful feedback. First of all, the track is clean and already rubbered in.

Weather conditions are usually close enough to race day to provide good comparison. But above all, the riders are already up to speed, so no time is wasted.

Johann Zarco put it very nicely: “I enjoy it so much, because you don’t lose half day to find the feeling, you already have the feeling,” the Frenchman said. “You just wake up, warm the bike up and you are ready, and you can start to work.”

“We did the same today. It’s good anyway. Even if you are tired from Sunday, you go on the bike, going over 300 km/h and that’s just a nice life!”

Dunlop Sportmax Q3+ tire owners have some worry today, as Sumitomo Rubber USA (the maker of Dunlop motorcycle tires) has issued a recall on its popular sport bike tire because of air pockets that may have formed during the tires’ curing process.

Sumitomo says that it has contained most of the affected 120/70ZR17 58W Sportmax Q3+ tires, which were made between April 27th and May 4th of this year, and that only four to seven tires need to be recalled from the consumer market.

Accordingly, Sumitomo will notify potentially affected Dunlop retailers and customers, and Sumitomo will offer replacement tires free of charge. The recall is expected to begin during June 2017. Concerned owners may contact Dunlop Motorcycle Tires at 1-800-845-8378.

After the jump, there is a timeline from Sumitomo on its discovery and quarantine process for the Dunlop Sportmax Q3+ tires. It makes for an interesting read regarding the internal QA process at the Dunlop tire facility.

Riders never really know how badly injured they are until they get on a MotoGP bike and try to ride. That was what happened to Valentino Rossi at Mugello on Friday.

He had expected to have a lot of pain breathing from the exertion of hustling a MotoGP machine around Mugello. “This track, Mugello, with a MotoGP bike, with this temperature is already very difficult physically even if you are at 100%,” Rossi said.

It turned out that it wasn’t the pain from the chest and abdominal injuries which were giving him the most problems in the morning.

“This morning, I had a problem with my arm, especially in acceleration. When I open the throttle and I had to hold onto the handlebar with all my strength, I had a lot, a lot of pain,” he said.

When you open the throttle on a MotoGP bike, though you push yourself forward on the balls of your feet as hard as you can, you still need to hang on to the handlebars with every ounce of your strength.

The battering Rossi’s body took in the motocross crash just over a week ago took its toll, and made him suffer. “Sincerely, I didn’t expect this, maybe I expected something else.”

Painkillers and physiotherapy, the paddock’s magic medical mix, made a big difference in the afternoon. Doing much more than five or six laps was still beyond him, but the improvement on Friday left Rossi optimistic.

“Usually, Friday is the worst day. After that, your body adapts to the temperature, to the stress, and we hope that I can improve.” He will almost certainly race, and he will almost certainly exceed any expectations he may have had a week ago. But it won’t be easy.