Scott Redding clocked his best time in Argentina during the opening day of free practice using Bridgestone's new extra-hard rear tyre, which has been introduced specifically to cope with the high speed and abrasion at the Termas de Rio Hondo circuit.

Redding, who is aiming to make up for the disappointment of his lap-one crash last weekend in Austin, was eighth fastest with a time of 1m 39.892s on the the Estrella Galicia 0,0 Marc VDS Honda.

The 22-year-old had been fifth fastest in FP1 but each of the riders who finished ahead of the British prospect in FP2 were using softer rubber.

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"I am happy with how today went. We found a good setting with the bike in Texas and I have hardly changed it here because I want to learn the bike more while I have such a good feeling with it," Redding said.

"The track wasn't in great condition this morning and it was tough to make a good lap time, but we made some progress with the rear pumping on the brakes. I'm happy to set my best time on the extra hard tyre and right now I think that will be my race choice," he added.

"I can't tell much difference in performance with the hard option we can use and the extra hard will certainly have better durability for the race."

The new extra hard is only available to the Factory class Honda and Yamaha riders, alongside a hard rear compound. Those racing with the Open class concessions (including Ducati, Suzuki and Aprilia) have the medium and hard to choose from.