Bridgestone – Bridgestone Battlax BT46 Bias Sport - Rear, including BT46R sizes from 110/80-18 and 110/90-18 through 120/80-17, 120/90-17, 130/70-17 and 130/90-16, gives air-cooled standards and older sport bikes a rear tire worth the upgrade. Bias-ply construction suits these chassis: the casing absorbs road imperfections, keeps ride quality civil and puts a broad contact patch down without demanding stiff modern suspension to work properly. What is new is the rubber itself. Bridgestone's compound gives the BT46R strong dry grip and confident wet traction, with a tread pattern angled to move water away from the center band where most braking and acceleration happen. Riders report a bike that holds its line better through a long sweeper and feels more settled on rough back roads, along with wear that stays even instead of stepping at the shoulders. Both H and V rated versions are offered across the size range, so cafe racers, twins and classic sportbikes are covered. If the rear on your bike is the tire it left the showroom with decades ago, this is where the biggest improvement in safety and feel is waiting.