FSA Headset Bearing TH-873/DJ (MR040)(30.15 x 41 x 7.3)mm – 36/45) FSA (Full Speed Ahead) headset bearings are a trusted, go-to choice for road and MTB riders. Precision-engineered with an angular contact design, they deliver smooth, reliable steering and are built to last — making them a smart, no-fuss replacement for a wide range of bikes. Outside Diameter: 41.0mm Inside Diameter: 30.2mm Height: 7.3mm Inside Angle: 36° Outside Angle: 45° TH Code: MR040 id: 30.15 od: 41 width: 7.3 mm