After four races where Pirelli's latest specification of F1 tyres has been one of the major talking points, this weekend's Spanish Grand Prix should give a more reasonable assessment of their potential.The biggest cause for concern has been the rate at which the tyres have degraded, although Pirelli has only been working to a directive requesting its help in spicing up the on-track action and strategy options.Despite calls for a wholesale return to last year's rubber, Pirelli has so far resisted the temptation to revert, although it continues to 'adjust' individual compounds on a race-to-race basis.A revised version of the hard tyre will be introduced in Spain, closer in characteristics to...
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