Bridgestone – Bridgestone Battlax BT46 Bias Sport - Front, including BT46F fitments in 16, 17, 18, 19 and 21 inch diameters, 90/90-18 and 100/90-18 sizes, 100/80-17 and 3.25-19 sections, is a modern answer to an old problem. Plenty of great motorcycles still use bias-ply front sizes that radial ranges simply ignore. The BT46F keeps that traditional casing but brings current compound technology to it, so warmup is quick, wet grip is far better than the tires these bikes wore when new, and the front end gives clear feedback as lean angle builds. Riders restoring or riding a classic sport bike, a standard, or a naked twin get lighter steering and noticeably more confidence under hard braking, without the harsh ride that a stiff sport radial would bring to an older chassis. Sizes here include 90/90-21, 100/90-16, 100/80-18 and 100/90-18 in H and V speed ratings. Fit a matched BT46 pair and a bike that once felt vague suddenly feels sharp. Confirm the original front size stamped on your swingarm decal or printed in the owner's manual before ordering, since bias-ply fitments vary widely across model years and markets.