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"  Unless you get your made-to-order trackside rubber from a MotoGP support truck, your next best bet is the new Dunlop KR451, a bespoke rear tire that could change the way racers adapt to racetracks. The KR451 was developed in conjunction with AMA racers like Roger Lee Hayden and uses a jointless tread application which winds the tread onto the carcass in continuous strips, allowing for reversible (as opposed to unidirectional) usage. But more crucially, Dunlop&amp;#039;s new offering can be ordered with different compounds on either side (which are clearly marked on the sidewalls), making the hoop favorable for either clockwise or counterclockwise flows.  As if racers didn&amp;#039;t have enough variables to consider when tackling different tracks every week, the options offered by bespoke tires adds yet another option to the mix... but on the bright side, at least it&amp;#039;s one less element that&amp;#039;s out of their control. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/cars/a8028/dunlop-bi-directional-tires/>