JT Sprockets
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JT Sprockets 525 Steel Rear Sprocket, 45T (JTR1877.45)

Part # JTR1877.45
Item #988008
Fits 22 motorcycles
  • Yamaha
    • YZF R1 · 2015–2021
    • YZF R1 (YZF1000) · 2022–2025
    • YZF R1 M · 2015–2021
    • YZF R1 M (YZF1000D) · 2022–2025
    • YZF R1 World GP 60th Anniversary Edition · 2022
    • XSR900 (MTM890) · 2022–2025
    • XSR900 GP (MTM890D) · 2024
    • MT-09 (MTN890) · 2021–2022
    • MT-09 (MTN890) · 2024
    • MT-09 (MTN890) · 2025
    • MT-09 SP (MTN890D) · 2021–2023
    • MT-09 SP (MTN890D) · 2024
    • MT-09 SP (MTN890D) · 2025
    • Tracer 9 (MTT890) · 2021–2023
    • Tracer 9 · 2025
    • Tracer 9 GT (MTT890D) · 2021–2023
    • Tracer 9 GT · 2025
    • Tracer 9 GT+ (MTT890D-K) · 2023–2024
    • Tracer 9 GT+ Y-AMT · 2025
    • 900 Nikken (MXT850) · 2018–2019
    • 900 Nikken (MXT850) · 2020
    • 900 Nikken GT (MXT850D) · 2020
$36.99
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WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov
JT Sprockets Steel Rear Sprocket — JTR1877.45 (45T)
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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