JT. Aluminium Ultra-Light 251 - 520 SprocketRef : JTC00511A / 1096568001

Replace your sprocket without compromise with the JT Sprockets JTA251.48BLK: an ultra-light aluminum sprocket designed for motocross and roadster riders who want to master their gearing. Designed to fit a 520 chain, it allows you to adjust engine behavior and transmission responsiveness according to your riding needs.

• Material: Aerospace aluminum 7075-T6 (Ergal) offering an excellent strength-to-weight ratio.
• Number of teeth: 48 teeth — standard configuration for modifying gearing.
• Pitch: 520, compatible with corresponding chain links.
• Finish: Black, treated surface facilitating debris removal (anti-mud effect).
• Type: Standard, direct replacement mount.

Versatile on track as well as off-road, this sprocket is suitable for torque climbs and the demands of frequent training. Its Ergal construction reduces unsprung mass for a more direct handling feel without sacrificing the inherent strength of the alloy.

Some compatible models (to be verified according to year and mounting):

• YAMAHA YZ 450 F (2026)
• FANTIC XX 125 (2022)
• GAS GAS EC 300 F (2015)

Brand: JT SPROCKETS — Manufacturer reference: JTA251.48BLK