The long straight at Indianapolis is a concern for Suzuki's Aleix Espargaro.

Straight-line performance is the GSX-RR's achilles heel and, while project leader Satoru Terada said at Sachsenring he hoped to have a seamless gearbox ready 'pretty soon', it looks like Espargaro and team-mate Maverick Vinales will be without the technology this weekend.

"The race in Indy will be fascinating because of the long history that goes with the circuit, but it won't be that easy for us," Espargaro said. "The layout worries me a little because of the long straight, but at the same time I'm excited to get back to racing after the positive tests we did in Misano before the break. We had the chance of verifying and developing many things and at the end we collected much data for all the forthcoming races."

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Despite a pole position at Catalunya, Espargaro finished the opening half of the season twelfth in the standings with a best race finish of seventh.

"My position in the championship doesn't reflect the effort that we are putting in and the improvements that we have made, we need a little more luck for the upcoming races and I'm sure that we will have even better results," he declared.

While Espargaro has suffered three non-scores, Vi?ales has brought his machine home in the points in every race - an exceptional achievement for a rookie. The young Spaniard is currently tenth in the championship, with a best race finish of sixth.

"We know that we need to be more effective from the very beginning of the race weekend and be immediately competitive in order to develop the bike and be fast in qualifying, therefore improving our start position. This is crucial in all races," he said.

"Indy will be fascinating, as it is such an historic circuit, but it will also require us to make a big effort to be competitive, thanks to its layout. After the first half of the season I feel that the team is giving me every support and this summer break has meant that I could train hard, so I'm feeling in good shape to get back riding."