Full Speed Ahead KFX i25 Boost 29″ Wheelset 24/24H 29″ Boost DB 6B TA15 HG 11sp. The FSA KFX i25 Boost 29″ Wheelset is a lightweight high-performance option for cross-country and trail riders. Featuring carbon fiber rims and Boost spacing it offers excellent stiffness and responsiveness for climbing and cornering. This wheelset is designed for riders who want to maximize speed and efficiency without sacrificing durability.