Z50 Heavy Duty Braced Kepspeed Racing +4.75" Wide 5.5J Swingarm (Black)

Z50 Heavy Duty Braced Kepspeed Racing +4.75" Wide 5.5J Swingarm

Built for serious wide wheel and fat tire Z50 builds. This Kepspeed Racing +4.75" swingarm is designed around a 5.5J rear wheel setup and is approximately 50mm wider than stock, providing the clearance required for true wide rear conversions.

Ideal for custom builds, big engine swaps, and riders who want a stronger, more planted rear end than the factory swingarm can offer.

• +4.75" extended length
• 5.5J wide wheel configuration
• Approx. 50mm wider than stock
• Heavy-duty aluminum construction with internal hex bracing
• CNC-machined pivot and axle blocks
• Rear-mounted Allen-style chain adjusters for precise tensioning
• Nylon chain slider to reduce wear
• Needle bearing pivot for smooth operation and durability
• Removable paddock stand supports

Important Installation Note

This swingarm requires a sprocket offset kit to properly align the chain.

For a 5.5J rear wheel setup, a 30mm front sprocket offset is required at the front countershaft and rear hub sprocket side to achieve proper chain alignment. A stock hub and front sprocket will not align correctly.

Wide builds may also require proper wheel spacing and alignment adjustments. This swingarm is intended for custom wide tire applications — not stock-width builds.

If you're building a true fat tire Z50 or stepping up to a full wide rear conversion, this swingarm provides the clearance, rigidity, and strength to do it right.

Includes

• Chain adjusters
• Extended brake rod
• Shock bolts
• Axle bolt
• Brake stay bracket
• Paddock stand supports

Fitment

Fits Honda Z50 (1972–1978), all Z50R (1979–1999), and Ice Bear Leo models.