This high-quality FSA lower headset bearing, with dimensions of 1-1/2" and a 36°x45° angle, is compatible with several Cervelo frames. It fits models such as the Aspero (2020-present), Aspero-5 (2022-present), Caledonia (2021-present), Caledonia-5 (2021-present), C2 Disc (2018-2019), C3 Disc (2016-2019), C5 Disc (2016-2019), P5X Disc (2017-2019), P3X/PX (2019-present), R2 Rim (2018-2019), R3/R-Series Rim (2018-2019), R3/R-Series Disc (2018-2019), R5 Rim (2018-2019), R5 Disc (2018-2021, 2023-present), R5CX (2023-present), and Soloist (2023-present), ensuring reliable performance and a precise fit for these Cervelo bikes.