Split spacers let you adjust stem height without pulling cables or disconnecting Di2 wires, and the Cervelo Spacer Kit 032 brings that convenience to the 5-series integrated cockpit design. Standard headset spacers require complete cable disassembly when you want to raise or lower the stem, but these left and right halves separate around the steerer tube and internal routing channel. The C-shaped profile matches the proprietary steerer on the Caledonia-5, Aspero-5, R5 Disc (2022 and newer), and R5-CX frames. If you're dialing in fit on one of these bikes or need replacement spacers after a stem swap, this is the correct kit.

The kit includes two 5mm spacer pairs and seven 2.5mm spacer pairs, giving you fine adjustment increments for cockpit height. Each spacer features an integrated channel that aligns with the internal routing path, keeping brake hoses and electronic wires protected and organized as they pass from the handlebar through the stem and into the frame. The composite construction keeps weight minimal while providing enough clamping surface to prevent movement under load. Cervelo developed this split system for their S-series aero bikes before bringing it to the 5-series platform, so the design has proven durability in race conditions.

One important note: these spacers only work with the C-shaped steerer tube found on the "-5" models. The standard Caledonia and Aspero use a traditional round steerer and require conventional round spacers instead. If you're unsure which steerer your frame has, the stem interface is the giveaway: ST31 carbon and ST32 alloy stems indicate the C-shaped system, while other stem models indicate the round steerer. The spacers install in matched left and right pairs, so keep them oriented correctly during assembly.