MSV Racing Billet Rear Axle Blocks

1989–2001 Honda CR500R, 1989–1992 CR125R & 1988–1991 CR250R

Upgrade worn, damaged or plain factory axle adjuster blocks with the MSV Racing Billet Rear Axle Blocks, precision-machined for select Honda CR125R, CR250R and CR500R motorcycles.

Based on the original Honda design, each pair is CNC-machined from high-strength 6061-T6 billet aluminum for precise axle alignment, dependable durability and a clean factory-performance appearance.

Product Highlights

• Fits 1989–2001 Honda CR500R
• Fits 1989–1992 Honda CR125R
• Fits 1988–1991 Honda CR250R
• Direct replacement for Honda OEM part 42306-KS7-830
• CNC-machined from 6061-T6 billet aluminum
• Sold as a complete matched pair
• Helps provide accurate rear-wheel and chain adjustment
• Direct installation with no modifications required
• Available in bright aluminum, black anodized or red anodized finishes
• Black and red finishes produced to MIL-A-8625 anodizing specifications
• Designed and manufactured for vintage Honda CR motorcycles by MSV Racing

Replace Worn or Damaged OEM Axle Blocks

The rear axle blocks help position the wheel and maintain correct chain adjustment. After decades of use, original blocks may become:

• Gouged or battered
• Corroded
• Bent or distorted
• Difficult to adjust accurately
• Visually worn during a restoration

The MSV Racing billet replacements restore a clean appearance while providing precise fitment around the rear axle and swingarm adjustment system.

CNC-Machined 6061-T6 Billet Aluminum

Each axle block is machined from durable 6061-T6 aluminum billet rather than cast or stamped material.

Benefits include:

• Accurate dimensions
• Consistent pair-to-pair fitment
• Excellent strength
• Corrosion resistance
• Clean machined appearance
• Long service life

Exact Honda Fitment

Honda CR125R

• 1989
• 1990
• 1991
• 1992

Honda CR250R

• 1988
• 1989
• 1990
• 1991

Honda CR500R

• 1989 through 2001

These replace Honda OEM axle block part number 42306-KS7-830.

Sold as a Pair

Each order includes:

• One left rear axle block
• One right rear axle block

You receive a matched pair ready to replace the original Honda components.

Available Finishes

Bright Aluminum

A clean, factory-inspired billet finish ideal for restorations and traditional builds.

Black Anodized

A durable, understated finish for a factory-performance appearance.

Red Anodized

A bold Honda-inspired finish that adds a custom race look to the rear wheel assembly.

Direct Replacement Installation

These axle blocks install in the original rear axle and chain-adjustment location.

Before installation:

• Inspect the rear axle
• Inspect the chain adjuster bolts and threads
• Check the swingarm adjustment surfaces
• Verify chain alignment
• Torque the rear axle nut to Honda specifications

Restore Precision and Finish the Build

Small details matter on a vintage Honda CR restoration or performance build. The MSV Racing Billet Rear Axle Blocks replace worn OEM components with a precise, durable and visually cleaner alternative.

Precision machined. Sold as a pair. Built for legendary Honda CR motorcycles.