JT. Aluminium Ultra-Light 251 - 520 SprocketRef : JTC00514A / 1096568004

JT Sprockets Ultra-Light Sprocket 251 - 520 (Manufacturer part number: JTA251.51BLK)

Designed for demanding motocross riders and roadsters, this JT Sprockets sprocket combines lightness and strength thanks to aerospace-grade 7075-T6 aluminum (Ergal). Ideal for part replacement or to modify the gearing ratio, it fits on 520 pitch chains and maintains a standard profile suitable for most setups.

• Material: 7075-T6 Aluminum (Ergal) — high strength, black finish.
• Number of teeth: 51 teeth (sprocket 51).
• Chain pitch: 520.
• Type: Standard, ultra-light to reduce unsprung mass.
• Finish: "Anti-mud" treatment promoting particle ejection and limiting buildup on the teeth.

Chain, sprocket, and crown form the basis of a healthy transmission: this JT sprocket allows you to regain predictable chain behavior and fine-tune your final ratio according to your use (track, trail, or road). Common compatibility examples: YAMAHA YZ 450 F (2026), FANTIC XX 125 (2022), GAS GAS EC 300 F (2015).