JT Sprockets
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JT Sprockets 520 Steel Front Sprocket, 13T (JTF1590.13)

Part # JTF1590.13
Item #987700
Fits 16 motorcycles
  • GasGas
    • 250 · 2011-2015
    • 300 · 2013-2015
    • 300 EC F Six Days 4T · 2012
    • EC 250 · 2011-2012
    • EC 250F · 2011-2015
    • EC 300F 4T · 2013-2015
    • EC 450F · 2013-2015
  • Yamaha
    • WR250 · 2008-2020
    • WR250F · 2001-2026
    • WR250R · 2008-2020
    • WR250X · 2008-2015
    • YZ125 · 2005-2026
    • YZ125 R · 2024-2025
    • YZ125X · 2020-2026
    • YZ250F · 2001-2026
    • YZ250FX · 2015-2026
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WARNING: Cancer and Reproductive Harm, www.P65Warnings.ca.gov
JT Sprockets Steel Front Sprocket — JTF1590.13 (13T)
Product Details

A direct-fit C49 high-carbon steel front sprocket from the world's largest sprocket maker — the standard for stock replacement on modern street, sport, and adventure bikes.

  • Self-cleaning SCM420 chromoly steel and C49 carbon steel construction, induction-hardened on the tooth profile for a hard wear surface over a tough core.
  • CNC-machined to OEM tooth profile so your existing chain runs without re-meshing issues.
  • Available with rubber-cushion damping inserts on select fitments — same noise/vibration spec as the OE part.
  • JT Sprockets is the world's largest sprocket manufacturer; produced in JT's UK and Thailand facilities to ISO-grade QC.
  • Sized for OEM gearing across most road, sport, and adventure platforms.

Intended use: street, sport, sport-touring, adventure.

Fitment

Fits 40 motorcycles across Yamaha, Gas Gas — including Gas Gas 250 EC 4T 2011–2012; Gas Gas 250 EC F 4T 2012–2015; Gas Gas 250 EC Six Days 2011–2012; Gas Gas 300 EC F 2013–2015; Gas Gas 300 EC F Six Days 4T 2012; Gas Gas 450 EC F 2013–2015; Yamaha YZ125 2005–2023; Yamaha YZ125 2026. Verify fit for your exact bike with the fitment checker at garamoto.com.

Specifications

Sprocket PositionFront
MaterialSCM420 chromoly steel alloy
Surface TreatmentHeat-treated and beadblasted
Best ForOff-road / Trail, Street

Verified from Garamoto’s catalog & fitment data.

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