Pirelli have shelved plans for Formula One teams to race with new-specification tyres in Canada next week but hope to have them in place for the British Grand Prix at the end of June.
A spokeswoman said two sets of the modified rear tyres, introduced after a spate of failures, would be used only in Friday practice in Montreal.
She said: "[It] gives everyone a chance to test them and hopefully all agree."
Red Bull have called for the 2013 tyres to be made more durable to reduce the number of pitstops.
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