Sep.1 (GMM) Christian Horner has hit back at claims Red Bull were slowed down at Spa-Francorchamps due to succumbing to the flexible wing saga.

McLaren's Jenson Button had said before leaving Belgium that the pace of the previously dominant RB6 had been "affected" by the more stringent deflection test, with the new floor tests to possibly have "even more of an effect" at Monza next weekend.

Button's boss Martin Whitmarsh, and Mercedes' Ross Brawn, also said they thought the front wings on the Red Bull and Ferrari cars were flexing less visibly than they had in Hungary earlier in August.

"I can categorically tell you that they are the same wings (at Spa) that ran in Hungary a month ago," Red Bull team boss Horner is quoted on Wednesday by the Telegraph.

"Whether that is the same for our competitors I can't say," he added.

Horner suggested it was the McLaren cars that were using different wing designs in Belgium.

"I would be very interested to know -- and you might find it was a silver wing that was most flexible (at Spa)," he said.

However, a video doing the rounds on the internet appears to show Sebastian Vettel's front wing moving visibly in and out of the slipstream in the moments before he crashed into Button.

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