RadiusX 4.0 Clutch Kit. A high-performance, stall-preventing auto clutch is just a clutch pack swap away. RadiusX combines TorqDrive friction disk technology with next-generation EXP 4.0 auto clutch disk functionality. Paired together, TorqDrive clutch disks and EXP 4.0 deliver stronger power delivery, improved clutch durability, and rider-focused, auto-clutch functionality, all in the framework of a drop-in clutch pack. EXP 4.0 prevents engine stalling so riders can focus on their line and let the clutch do the rest, while TorqDrive provides increased power transfer and durability over O.E.M. Each RadiusX kit may also include Rekluse basket sleeves, protecting O.E.M. baskets from notching. This latest generation RadiusX clutch kit from Rekluse is the perfect choice for riders looking for unmatched clutch functionality within the convenience of a clutch pack. Featured Technology: EXP 4.0. TorqDrive®.