Profile Racing Spider-Spline Drive Chainring

The spline drive system eliminates the need for traditional chainring bolts, which can loosen over time. By mounting directly to the splined axle, you get a more secure, direct power transfer and a cleaner aesthetic for your drivetrain.

This spider is specifically designed for Profile Racing cranks using 19mm or 22mm splined axles. It is not a universal part, so please verify your crank axle diameter before purchasing.

The pre-pressed CrMo steel insert provides a hardened interface between the aluminum spider and the steel crank axle. This prevents the softer aluminum splines from stripping or wearing down under high torque, ensuring a long-lasting connection.

This design mounts the chainring directly over the external bearing cup, which helps push the chainring outward. This is essential for achieving an optimal chainline when running outboard bottom brackets, preventing chain drop and excessive wear.

Yes, it is built to handle the demands of both disciplines. The billet aluminum construction offers a high strength-to-weight ratio suitable for the aggressive riding styles found in both BMX and MTB.

Yes, there is a slight difference. The 4-bolt version weighs 74g, while the 5-bolt version weighs 83g. Choose based on the bolt pattern of the chainring you intend to mount.