The effectiveness of concrete filled fibre-reinforced polymer (FRP) tubes (CFFTs) as compression and flexural members in bridges has attracted much attention. The FRP tube combined with the post-tensioned concrete system is intended to improve the constructability and structural efficiency of small to medium-scale wind turbines. Since such towers are constructed in segments, this study aims to understand the construction feasibility of segmental post-tensioned CFFT (PT-CFFT) beams with a spliced zone and to compare their flexural behaviour with control nonsegmental PT-CFFT beams. Five large-scale specimens were constructed and tested under three-point bending, including three segmental hollow PT-CFFT specimens and two non-segmental hollow PT-CFFT control specimens. The specimens were designed to study the influence of the following parameters on the performance of tapered hollow CFFT wind turbine towers: segmental construction methods for scaled wind turbine towers, contribution of outer GFRP tubes, and overlapping length between consecutive CFFT segments. The appropriate overlap length between two GFRP tubes required to develop the full flexural capacity of the CFFT system was determined experimentally, and the feasibility of combining GFRP tubes, prestressing systems, and segmental construction in tapered wind turbine towers was evaluated.