The design of this tires was conceptualized so that the tire was not directional and instead of building a tread pattern on a slick, we actually cut into the slick to create a tread pattern.  The result is a tread that flexes less for more stability under load and better exit traction.  The compound was selected so that these tires still perform really well once the tread pattern has worn down well beyond being visible.  In high traction conditions, this allows this tire to be used in smaller diameters, providing superior corner speed. Additionally we optimized the tire diameter for maximum corner speed  and better rotation on the individual application.  The 14mm tire is only 24.5mm in diameter, while the 11mm tire comes in at 25.25mm when mounted with super glue.

We recommend the 30 degree rear tires under most conditions.  They work well in temps as low as 45 degrees (F) and perform well all the way into the 80's (F).  If the grip is higher, simply cut the tire down smaller if you want a little more rotation in tight corners.