What limitation do "Rzeppa" CV joints have?

The limitation of "Rzeppa" CV joints is primarily related to the angles at which they can effectively operate. Rzeppa joints are designed to handle a specific range of angles, typically allowing for operation at angles of up to 30 degrees. Beyond this range, the efficiency and performance of the joint decrease significantly, leading to increased wear and potential failure.

The correct choice highlights that they cannot operate effectively at angles of up to 90 degrees, aligning with the design limits of these joints. While CV joints are crucial in transferring torque at varying angles, Rzeppa joints have particular constraints that make them ideal for moderate angular operations, rather than extreme angles.

Additionally, other limitations include that they can be sealed to retain lubrication and prevent contamination, can be used at various speeds, and are designed to function effectively in a range of driving conditions, rather than being limited strictly to straight-line movement.