The "Extreme" uni-directional tread design provides NT-450 radials with excellent wet weather performance and superior traction, while delivering a smooth ride. A double-V tread design comprised of a combination of slanted grooves and lateral slits provide efficient water drainage to ensure superior wet-road handling. The NT-450 tread compound provides superior high-speed stability and retains flexibility at low temperatures. If you need help picking out a tire, or have questions about sizing, please contact us at 1-480-966-3040.