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.
Subscribe to Independent Premium to bookmark this article
Want to bookmark your favourite articles and stories to read or reference later? Start your Independent Premium subscription today.
Join our commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies