wolf tooth direct-mount elliptical/oval drop-stop chainring for sram direct mount cranks (30t) wolf tooth components more power? check. better traction? definitely. less shifting? yup. funky uneven pedal stroke? not with wolf tooth’s <b>powertrac elliptical</b> chainrings. our proprietary design means a slightly less ovalized ring (10%) with less aggressive timing (112°) than competitors’ versions; any change to your pedal stroke is unnoticeable for most riders, but they still provide the power and traction benefits inherent to oval chainrings.<p> it’s like having two chainrings in one! with <b>powertrac elliptical </p>rings, the larger-diameter section of the ring engages with the chain at the optimal point on the downstroke, or “power zone,” – between 1-5 and 7-11 on a clock face – to take advantage of your body’s natural biomechanical power: for example, during this section, a pte 34t ring is equivalent to a 36t round ring. similarly in the “recovery zone” (11-1 and 5-7), the smaller section on the pte ring engages, maximizing efficiency in the weakest part of the pedal stroke; here the pte 34t ring is equivalent to a 32t round ring.<p> additionally, the above provides a smoother, more efficient pedal rotation, which means better traction. steadier torque on the rear wheel means less spinning out in the “power zone,” while pedaling is easier during the “recovery zone,” so you maintain momentum. <p> <strong>tech specs:</strong><br> <ul> <li>designed and manufactured in minneapolis, mn usa</li> <li>wolf tooth’s patent-pending drop-stop wide/narrow tooth profile for the ultimate chain retention and mud shedding ability</li> <li>recommend the use of a clutch style rear derailleur for the best chain security. </li> <li>material 7075-t6 aluminum</li> </ul>