Vortex 841ZK-51 Rear Sprocket 51-Tooth Marchesini PVM Aluminum Racing Sprocket

The Vortex 841ZK-51 is a 51-tooth rear sprocket precision-engineered for motorcycles equipped with Marchesini or PVM aftermarket wheels. Designed to meet the demands of competitive road racing, this sprocket delivers the lightweight performance and durability that serious racers depend on.

Manufactured entirely in the USA from 7075 T6 billet aluminum, this sprocket is CNC machined to exacting tolerances using a specially formulated alloy developed to Vortex's own specifications. The silver anodized finish provides corrosion resistance, while the unique saber tooth groove geometry — a Vortex patented design — reduces wear and extends sprocket service life compared to conventional sprockets.

Key Features:

• 51-tooth rear sprocket — ideal for fine-tuning final drive gearing
• Marchesini and PVM aftermarket wheel fitment (841ZK bolt pattern)
• 100% CNC machined from 7075 T6 billet aluminum
• Manufactured in the USA to Vortex's tight tolerances
• Silver anodized finish for corrosion protection
• Patented saber tooth groove design for increased longevity
• Lightweight construction reduces rotating mass for improved power delivery
• Also available in PTFE black hardcoat for enhanced durability and reduced friction

The Vortex 841ZK-51 is the preferred choice for racers running premium aftermarket wheel packages who demand precision fitment, reduced unsprung weight, and proven track performance. Vortex Racing has been crafting top-quality motorcycle racing components in the USA since 1995.