Ribble Ultra SL Headset Bearing Kit (Different Lower)

Headset bearing kit to fit this Ribble bike Upper Bearing – MH-P16 (40 x 52 x 7 - 45/45) Lower Bearing –ACB518K (40 x 51.8 x 8 - 36/45) Depending on the year and frame size, some have the same upper and lower bearing: MH-P16 - 40 x 52 x 7 - 45/45. See "Same Upper & Lower" kit for this version instead. Please check your bearings to ensure correct kit. High quality bearings.