Christian Horner says he is frustrated Pirelli has adopted a conservative approach to tyre production over the winter, insisting last year's rubber offered the right balance between strategy and degredation

Pirelli has come under scrutiny in recent weeks for its tyre choices and development, with many getting frustrated in Monaco at the inability to get the 'soft' tyres warm, branding them as too hard.

The move to more conservative tyres comes after Pirelli came under fire in the early years of its tyre tender having been briefed by the FIA to create higher degrading tyres to spice up the racing action, leading to some high-profile failures and inconsistences across the field.

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Now teams feels the firm has gone too far the other way, with Red Bull Racing manager Horner airing his frustration in the wake of a particularly dull Canadian Grand Prix that saw just a single stop for many of the drivers.

"I think we had more downforce a few years ago that abused the tyres a bit more but I think one-stop races are not good for F1 - you need to have 2-3 stops - and that's important. We have tyres that are just a bit too conservative.

"Managing the tyres is more about how the driver is using his right foot - he's not lifting at the end of the straights, so I think that's an easier issue to deal with. Pirelli did go too far if you think back to Silverstone 2013 and I think, as a result of that, their reaction was that we've ended up with a pretty conservative tyre.

"Then changes that were made over the winter, going into this year, went a bit more conservative again. The tyres that we had last year were, probably, about the right balance for strategy and degradation."

Going forward, Horner proposes that races are shortened slightly to remove the need for both fuel and tyre saving, giving the drivers more chance to push.

"Shorten the race by five laps or whatever it is. Either a bit more fuel or a bit less distance, but it needs to be a flat-out sprint race from start to finish."