The tyre issue in BSB and British Supersport has for a long long time been about who are the favoured teams.
There are a number of teams running bikes more than capable of winning that have been restricted access to a certain level of tyre that's available to some of the selected 'works' teams. Even if you are a Dunlop supported rider/team you will not have the same tyres that the 'selected' teams get. You only have to watch at the Dunlop enclosure in the paddock to see where certain wheels go for tyre changes to see it first hand.
It is widely accepted that the tyres that have been available by Dunlop and Michelin to their 'selected' teams have a significant advantage in terms of lap times over the customer tyres everyone else gets. This has applied to race and qualifier tyres and makes a difference of up to about a second per lap on some circuits. When the top riders are that second away from lesser teams who are still spending maybe $500,000NZ+ a season you can understand why many teams have pushed for the rule.
Dunlop are the established bench mark tyre in the BSB series as far as slicks go, with Michelin just being used by the works Honda's. Don't forget that the Dunlop and Michelin tyres in BSB have full works backing so to speak and are the best tyres available and developed outside of MotoGP as far as Michelin is concerned as BSB is there recognised development series.
For Dunlop not to get the series tyre support is a huge story but not unexpected what with Pirelli supplying WSB and the series having such strong links via promoters. Of course the factal that the company is Italian will have had nothing to do with the choice...
I think its a good move but also a shame because Dunlop's development of tyres is now likely to slow or stop in terms of race tyres.
Cost wise for the bigger teams i think it will be less but for smaller teams it may stay about the same so long as Pirelli don't get greedy with their contract.
Next seasons BSB and BSS seasons could very well bring some surprises results wise as riders with good bikes suddenly find themselves on a level palying field tyre wise.
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