JT Sprockets
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JT Sprockets 420 Steel Rear Sprocket, 37T (JTR801.37)

Part # JTR801.37
Item #JT80137
Fits 79 motorcycles
  • Kawasaki
    • Z125 Pro (BR125) JHF, JHFA.JJF.JJFA.JJFB,JKF,JLF,JMF,JNF,JPF,JRF · 2017–2024
    • KLX110 A2,A3,A4,A6F,A7F,A8F,A9F · 2003–2009
    • 125 Joy-R · 2008–2010
    • KLX110 A1 · 2002
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    • KLX110 R CMF · 2021
    • KLX110 R CNF,CNS · 2022
    • KLX110 R CPF,CPS · 2023
    • KLX110 R CRF,CRS · 2024
    • KLX110 R CFS · 2025
    • KLX110 R CTF · 2026
    • KLX110 L DAF,DBF,DCF,DDF,DEF,DFF,DGF,DHF,DJF,DKF,DLF · 2010–2020
    • KLX110 R L DMF · 2021
    • KLX110 R L DNF, DPF · 2022–2023
    • KLX110 R L DRF,DRS · 2024
    • KLX110 R L · 2025
    • 115 Kaze-R · 2013–2015
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    • AE50
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    • AE50 · 1982–1983
    • AR50 A1,C2-C10 · 1981–1998
  • Suzuki
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    • DR-Z110 K5 · 2005
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    • ER21 50
    • TS50 ERN,T,X,Z,K · 1980–1984
    • TS50 ERK,N,T,X · 1979–1981
    • TSX50 (TS50XK-) · 1984–2000
    • TS50 ER · 1980–1983
    • TSX50 (TS50XK-N,P,R) · 1992–1996
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WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov
JT Sprockets Steel Rear Sprocket — JTR801.37 (37T)
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.

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