In a shocking turn of events, Casey Stoner announced at the Thursday press conference for the French GP that he would be retiring at the end of the 2012 MotoGP season. The news is a turn of events, as the Australian denied such rumors at Estoril, saying he would quit motorcycle racing when he no longer enjoyed it, though not any time soon.

Citing his disappointed with the direction MotoGP is currently headed, Stoner main critique with premier-class motorcycle racing has been the introduction of the CRT rules, which use production-based motors in prototype chassis, and have been notably slower than the full-prototype machines.

Stoner first voiced the idea of his retirement over the CRT issue back in Valencia of last year, when the newly crowned World Champion stated that if the future of the MotoGP Championship was in the CRT formula, then it was a future he did not want to be a part of. Today’s announcement seems to make good on that statement.

The folks at GP Tech are no strangers to running wild card entries at Indy, as the American motorcycle parts seller fielded one-off wild card rides in the Moto2 Championship at both the 2010 and 2011 Indianapolis GP’s. Using FTR-built bikes, GP Tech raced with Jason DiSalvo in 2010, were the American rider finished a very respectable 9th place, while in 2011 Jake Gagne rode to a forgettable 31st spot.

Stepping up to the big-boy leagues, GP Tech has been granted a wild card entry for the 2012 Indianapolis GP, and will run a Suzuki GSX-R1000 motor in a billet aluminum frame that is being prepared by BCL Motorsports. GP Tech has also tapped Vesrah Suzuki/MCJ Motorsports to help with the project, which should give us some clues as to whom the unnamed rider will be for the Grand Prix race.

This, race fans, is Danilo Petrucci, one of the brave souls trying his luck on the future of MotoGP hardware, in his case the doggedly underpowered Came IodaRacing Project machine. Not on a (relatively) zippy Aprilia ART, or a Honda-powered FTR, Petrucci qualifies on the same grid as Casey Stoner and Jorge Lorenzo, and brings to this gunfight a knife that packs a whopping 185 bhp, compared to the factory prototype engines that are rumored to be around 260 bhp.

As I photograph a race, I see a much different version of the event than TV viewers. I watch the recorded TV broadcast later, and can tell you that there is a lot going on with the Claiming Rule Team bikes that doesn’t make in onto TV. I’m generally moving the entire time (when I haven’t stopped to photograph a turn obviously), so I see the entire field go past, lap after lap. Since Qatar I’ve noticed that most of the CRT talk has centered around the machines, and that no one I’ve seen has talked much about what the CRT riders are going through.

Though we currently have in the sub-set of MotoGP bikes a group of machines that are less expensive to run and correspondingly less impressive in the performance category, the fellows riding them are not similarly handicapped when it comes to racing spirit. They aren’t trying half as hard because they have no chance to win. Much of the time it seems just the opposite; because they don’t want to be six seconds a lap slower, they are trying that much harder merely to get within four seconds of the fastest times.

We will have to update our CRT spotter’s guide, as BQR’s Avintia Blusens team has dropped its aluminum Suter frame in favor of Inmotec’s carbon/aluminum chassis for rider Spanish Ivan Silva. Making at least Silva’s side of the garage an all-Spanish affair for the team, BQR has reportedly been working with Inmotec since the pre-season, but opted for the British-designed FTR chassis for the start of the MotoGP Championship.

With the news breaking last week that Attack Performance had been given permission to run a wild card entry at both MotoGP in the United States, the American team has confirmed their entry, and that AMA Superbike rider Steve Rapp will race a Kawasaki-powered CRT race bike. Well-known in the AMA paddock, Attack Performance will build its own all-aluminum custom chassis for the CRT effort, and will house a heavily modified Kawasaki ZX-10R engine

“I’ve wanted to design my own chassis for 10 years,” said Attack Performance Team Owner Richard Stanboli, “so this new class structure, essentially a Superbike engine housed in a prototype chassis, has provided an ideal opportunity for me. We have a great deal of work to do before the first event at Laguna Seca, but I’m no stranger to 20-hour days.”

The claiming rule team (CRT) bikes are both figuratively and literally under the spotlight at Qatar this race weekend, with their production-based motors and prototype frames shaking up the norm of pure prototype racing. Both an effort to take power away from MotoGP’s MSMA, which is comprised of Ducati, Honda, & Yamaha, and as an effort to lower the cost of racing in MotoGP for its participating teams, the CRT experiment is getting its first real test this weekend.

Swelling MotoGP’s grid with an additional nine-racer entries, the CRTs have certainly helped fill MotoGP’s ranks, though mostly with riders we are not familiar with. Leading the CRT charge is American Colin Edwards, and he is joined by Randy de Puniet, who didn’t wish to be on a CRT for the 2012, but has still found himself at the top of the heap. These two veteran MotoGP riders have been accompanied by seven riders that hail from a range of world and national championships that span everything from Spanish Superbike (CEV) to British Superbike to the Moto2 Championship.

Since on Sunday morning, MotoGP fans are going to have learn the names of these new riders and the bikes they ride, we have put together a primer on the CRT entries for the 2012 MotoGP Championship. Bios, specs, and notes on all nine MotoGP CRT entries are after the jump.