Vortex Racing V4 43 Tooth 520 Rear Sprocket - Black - 642AZKV4-43

The Vortex Racing V4 43 Tooth 520 Rear Sprocket in Black (Part# 642AZKV4-43) is a precision-engineered rear sprocket built for riders who demand race-proven drivetrain performance. As the next evolution in Vortex Racing's aluminum sprocket platform — developed from decades of motorsport experience — the V4 line represents a significant step forward in lightweight sprocket design. If you're running a 520-pitch chain setup and need a reliable, performance-focused 43-tooth rear sprocket, this is a serious upgrade worth considering.

Key Features & Benefits

• V4 Platform Design: The V4 represents the latest evolution of Vortex Racing's aluminum sprocket lineup, building on a long history of supplying the racing community — giving you a product refined through real competition feedback.
• 520 Pitch Compatibility: Designed specifically for 520-pitch chains, which are common on sport and performance motorcycles. Running a 520 conversion or already on a 520 setup? This sprocket slots right in.
• 43-Tooth Configuration: A 43-tooth rear sprocket sits in the range favored by riders looking for a balance between acceleration and top-speed — commonly chosen for track days, aggressive street riding, or replacing stock gearing on many sport bikes.
• Black Finish: The black anodized finish provides a clean, aggressive aesthetic that complements a variety of wheel and swingarm color schemes, while also offering a layer of corrosion resistance.
• Made to Order in Japan: This specific SKU is produced to order in Japan, reflecting a commitment to precision manufacturing quality. Build-to-order production ensures you're receiving a freshly made component, not warehouse shelf stock.
• Vortex Racing Pedigree: Vortex Racing is a recognized name in the motorcycle racing world, with a product catalog trusted by road racers and performance street riders alike.

Specifications

• Brand: Vortex Racing
• Part Number (MPN): 642AZKV4-43
• SKU: VTX642AZKV4-43
• Sprocket Line: V4
• Tooth Count: 43
• Chain Pitch: 520
• Color/Finish: Black
• Package Dimensions: 12.00" W × 12.00" D × 0.50" H
• Production: Made to order in Japan — allow 16–24 weeks for delivery

Fitment

The Vortex Racing V4 43T 520 rear sprocket is designed for motorcycles running a 520-pitch chain. Fitment is determined by both the chain pitch and the sprocket carrier/bolt pattern specific to your bike. Because this is a performance aftermarket sprocket, it is critical to verify that your motorcycle uses a 520-pitch chain (or that you are performing a 520 conversion) and that the hub/carrier bolt pattern matches this sprocket's specification before ordering.

Based on available sourcing, the V4 line has been noted as compatible with 5-bolt patterns used on BST, Core Moto, and Rotobox wheels (as referenced in retailer communications). If you are unsure whether this sprocket fits your specific bike, year, and wheel combination, contact the ThreePiece.us fitment team before ordering — especially given the 16–24 week special order lead time.

Do not assume fitment based on tooth count alone. Bolt pattern, carrier type, and chain pitch must all match your application.

What's in the Box

This listing covers the Vortex Racing V4 43 Tooth 520 Rear Sprocket in Black (642AZKV4-43). Sprocket mounting hardware (bolts, carrier) is not confirmed to be included and should be sourced separately if needed. Verify what's required for your specific installation before ordering.

Why Buy from ThreePiece.us

• Free Shipping: ThreePiece.us offers free shipping on every order — no minimum required.
• Affirm Financing: Need to spread out the cost? Financing is available through Affirm, so you can get the parts you need now and pay over time.
• Expert Fitment Support: ThreePiece.us has served 10,000+ customers and specializes in fitment guidance. Call the team at 813-535-5801 or email sales@threepiece.us — especially important for a special-order item like this where lead times are significant.
• Price Match Guarantee: Found a lower price elsewhere? ThreePiece.us offers a price match guarantee on products they carry.
• Get Notified on Stock: Currently out of stock? Use the "Notify Me" feature on the product page to get an email alert when it becomes available.

Frequently Asked Questions

Q: How long will it take to receive this sprocket?
A: This is a special-order item made to order in Japan. The estimated lead time is 16–24 weeks. Please plan accordingly and do not order this part if you need it urgently. For the most current ETA, contact the ThreePiece.us team directly at 813-535-5801.

Q: Will this sprocket fit my bike's stock chain?
A: This sprocket is designed for a 520-pitch chain. Many sport bikes come from the factory with a 530 or 525 chain. If your bike is not already running a 520-pitch chain, you will need to convert your chain and front sprocket to 520 as well. Always confirm your chain pitch and sprocket carrier bolt pattern match before purchasing.

Q: Is this sprocket compatible with BST or Rotobox carbon wheels?
A: The Vortex V4 sprocket line has been specifically noted as available for the 5-bolt pattern used on BST, Core Moto, and Rotobox wheels. However, confirm the exact bolt pattern and fitment for your specific wheel with ThreePiece.us before ordering, as sprocket fitment depends on multiple variables.

Q: What if I order and it doesn't fit?
A: Given the 16–24 week special-order nature of this item, we strongly recommend verifying fitment with the ThreePiece.us team before placing your order. Call 813-535-5801 or email sales@threepiece.us for fitment assistance. Reviewing return and cancellation policies for special-order items before purchasing is also advisable.