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JT Sprockets 525 Steel Rear Sprocket, 42T (JTR899.42)

Part # JTR899.42
Item #207358
Fits 20 motorcycles
  • KTM
    • 950 LC8 Adventure · 2003–2006
    • 950 LC8 Adventure S · 2004–2006
    • 990 Adventure · 2005–2013
    • 990 Adventure R · 2010–2013
    • 990 Adventure S · 2006–2008
    • 1050 Adventure · 2015–2016
    • 1090 Adventure · 2017–2018
    • 1090 Adventure R · 2017–2019
    • 1090 Adventure S · 2019
    • 1090 L Adventure L · 2017–2019
    • 1190 Adventure · 2013–2016
    • 1190 Adventure R · 2013–2016
    • 1290 Superadventure · 2015–2016
    • 1290 Superadventure R · 2017–2024
    • 1290 Superadventure S · 2017–2024
    • 1290 Superadventure T · 2017–2018
    • 1390 Superadventure R · 2025–2026
    • 1390 Superadventure S · 2025–2026
    • 1390 Superadventure S EVO · 2026
    • 950 Super Enduro R · 2006–2010
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WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov
JT Sprockets Steel Rear Sprocket — JTR899.42 (42T)
Product Details

A C49 high-carbon steel rear sprocket — JT's bread-and-butter replacement that swaps in like the OEM part for hundreds of street and sport fitments.

  • C49 high-carbon steel, induction-hardened on the tooth crowns for wear life that outlasts cheap stamped aluminum on the street.
  • CNC-machined to OEM bolt pattern and profile so it lines up to your hub without modification.
  • Same fitment universe as JT's zinc-black (ZBK) and self-cleaning (SC) variants on this base.
  • Built by JT Sprockets — the world's largest sprocket manufacturer, with sprocket production for major OE bike brands.
  • Sized to OEM gearing with shorter/taller tooth-count options available on select fitments.

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

Fitment

KTM: 950 LC8 Adventure 2003–2006 · 950 LC8 Adventure S 2004–2006 · 990 Adventure 2005–2013 · 990 Adventure R 2010–2013 · 990 Adventure S 2006–2008 · 1050 Adventure 2015–2016 · 1090 Adventure 2017–2018 · 1090 Adventure R 2017–2019 · 1090 Adventure S 2019 · 1090 L Adventure L 2017–2019 · 1190 Adventure 2013–2016 · 1190 Adventure R 2013–2016 · 1290 Superadventure 2015–2016 · 1290 Superadventure R 2017–2024 · 1290 Superadventure S 2017–2024 · 1290 Superadventure T 2017–2018 · 1390 Superadventure R 2025–2026 · 1390 Superadventure S 2025–2026 · 1390 Superadventure S EVO 2026 · 950 Super Enduro R 2006–2010

Specifications

Sprocket PositionRear
MaterialC49 high carbon steel
Surface TreatmentHeat-treated and beadblasted
Best ForOff-road / Trail, Street

Verified from Garamoto’s catalog & fitment data.

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