SE MX 3042 AL V2 - 30mm Bottom Bracket Seal - 30mm x 42mm Enduro bearings are designed and built for long-lasting durability, but unfortunately, some of the surrounding parts can still wear out over time. This light-contact silicone seal is similar to the new front seal provided with Enduro Torqtite Solid Lube for 30mm axle bottom brackets. This light-contact seal seals directly at the outer diameter of the bearing, making it more versatile. Apply a thin layer of grease to the back of the seal for optimal performance.