JT Sprockets
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JT Sprockets 420 Steel Rear Sprocket, 37T (JTR1213.37)

Part # JTR1213.37
Item #JT121337
Fits 9 motorcycles
  • Honda
    • CRF50 F-4,5,6,7,8,9,A,B,C · 2004–2012
    • CRF50 F-D,E,F,G,H,J,K,L · 2013–2020
    • CRF50 F-M · 2021
    • CRF50 F-N · 2022
    • CRF50 F-P · 2023
    • CRF50 F-R · 2024
    • CRF50 F-S · 2025
    • CRF50 F- · 2026
    • XR50 · 2000–2004
$15.99
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WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov
JT Sprockets Steel Rear Sprocket — JTR1213.37 (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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