BB SET OR8 REVOLVR SHI/GXP OUTBOARD CENTER SLEEVE ONLY 120mm FAT BIKE BK Machined AL6061 alloy construction. Center sleeve for use with Revolvr outboard bottom brackets. Converts 68/73mm outboard bottom bracket to a 100mm or 120mm fat bike model. Seals and protects the bearings from harmful contaminants. Center sleeve only - Revolvr outboard bottom brackets sold separately. Item Specifications: Length: 120mm, Disc Material: AL6061,