18.1421 Inner Clutch Hub for Honda CRF450R CRF450RX CRF 450R 450RX 2021-2026

Inner Clutch Hub for Honda CRF450R and CRF450RX

This inner clutch hub is a replacement clutch component for the Honda CRF450R and CRF450RX, holding the clutch plates and transmitting drive through the clutch pack. It cross-references OEM part number 18.1421 and fits CRF 450R and 450RX models from 2021 through 2026.

Overview

This inner clutch hub for Honda CRF450R and CRF450RX is a direct-fit clutch component that carries the fiber and steel plates while seating the clutch springs. The inner clutch hub maintains correct plate alignment so the clutch engages smoothly under the heavy loads of motocross and off-road riding. It suits riders servicing a worn clutch on 2021 to 2026 CRF 450R or 450RX models.

Built For Performance

• Precision-machined splines for clean plate engagement
• Built to withstand high-torque clutch loads on 450cc engines
• Correct stack height dimensions for proper clutch pack fitment
• Direct replacement for the stock hub on CRF450R and CRF450RX
• Spring seat bosses machined to accept standard clutch springs

Fits These Machines

• for Honda CRF450R 2021
• for Honda CRF450R 2022
• for Honda CRF450R 2023
• for Honda CRF450R 2024
• for Honda CRF450R 2025
• for Honda CRF450R 2026
• for Honda CRF450RX 2021
• for Honda CRF450RX 2022
• for Honda CRF450RX 2023
• for Honda CRF450RX 2024
• for Honda CRF450RX 2025
• for Honda CRF450RX 2026

On-The-Job Use

• Clutch rebuilds on 2021 to 2026 CRF450R motocross bikes
• Servicing CRF450RX off-road and enduro machines
• Replacing a notched inner hub that causes clutch drag or chatter
• Routine clutch maintenance between race seasons

Specs At A Glance

Good To Know

Q: Should I inspect the outer basket when replacing this inner clutch hub? A: Yes, the outer basket should be checked for notching and wear whenever the inner clutch hub is replaced. A worn basket can cause the same clutch drag that a bad hub produces.

Q: Can this inner clutch hub be used with the stock clutch plates? A: It is designed to fit with standard clutch plate dimensions for the CRF450R and CRF450RX. Confirm plate and spring specs before assembly to keep the clutch pack within tolerance.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.