Yamaha YZ 125/250 1999-2026 & YZF-WRF 250/426/450 1999-2026 JT Twinstar Steel-Aluminum Hybrid Sprocket.
Steel outer ring
Heat-induction hardened high-carbon steel
JT advanced tempering process achieves hardness that could last six times longer than a 7075-T6 aluminum sprocket, enhancing power transfer performance
Alu core
Lightweight aviation-grade ergal 7075-T6 aluminum
Precision made using state of the art laser cutting and CNC equipment, resulting in an ultra lightweight race power design
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