The CeramicSpeed BSA Bottom Bracket for Shimano Road is engineered for cyclists who demand smooth performance and lasting durability. Designed for English-threaded (BSA) bottom bracket shells, it fits 68mm wide, 34mm inside diameter frames with reverse threading on the drive side-the most common standard in use today. Compatible with 24mm diameter thru-axle cranks from Shimano, FSA, Rotor, and more, this bottom bracket ensures a precise and secure fit for optimal power transfer. Available in two bearing options, the Standard Bearings feature hardened-steel races with ultra-smooth CeramicSpeed balls for minimal friction and long-lasting performance. The Coated Bearings further enhance longevity and reduce friction with coated, hardened-steel races, making them ideal for riders seeking peak efficiency and durability. Whether you&';re on the road, competing in triathlons, or racing on the track, this bottom bracket is built to elevate your ride. Key Features: Precision Fit - Designed for BSA-threaded 68mm bottom bracket shells. High-Performance Bearings - Choose between Standard and Coated options for reduced friction. Wide Compatibility - Works with 24mm spindle cranks from Shimano, FSA, Rotor, and more.