Team Associated RC18T/RC18R Billet Aluminum Caster Block RC18-008/SI by 3Racing  [RC18-008/SI]

Billet caster block for precise steering mounts

The RC18-008/SI is a machined aluminum caster block designed as a replacement for the factory plastic unit used on Team Associated RC18T and RC18R platforms. It increases structural stiffness at the front steering attachment without altering suspension geometry, making it a targeted tuning upgrade for drivers chasing more consistent steering response.

Installation requires standard hobby tools: remove the original caster block, relocate bearings or shims as required, fit the aluminum block to the upright and secure with the existing hardware. Accurate fastener torque is recommended to preserve bearing preload and avoid steering bind during full suspension travel.

From a setup perspective the block functions as a chassis stiffness adjustment. Reducing local compliance at the steering mount decreases transient steering deflection under load, which helps maintain toe and caster settings when cornering aggressively. Combine with high-quality bearings and precisely adjusted steering links for intended performance gains.

Technical notes for tuners

• Verify geometry after fitment to confirm caster and toe targets are maintained.
• Preserve original spacers and seals to keep bearing preload within expected tolerances.
• Conduct a full travel binding check, particularly when using aftermarket uprights or non-standard hub offsets.