JT 45T Steel Rear Sprocket JTR269.45 — C49 High Carbon, Heat-Treated & Hand-Finished

Built to meet the demanding needs of powersports riders, the JTR269.45 rear sprocket combines robust material choice with precise machining. JT uses C49 high carbon steel for strength and wear resistance, then heat treats and hand-finishes each unit. Every sprocket passes a series of ten quality-control checks to ensure fit, concentricity, and tooth profile accuracy before it ships.

How does this sprocket improve drivetrain durability?

The JTR269.45 uses a high carbon C49 steel alloy that offers superior tensile strength compared with softer steels. Heat treatment hardens the tooth surfaces to resist wear, while the hand finishing process polishes contact areas to reduce abrasive friction. Together these steps extend service life and maintain consistent chain engagement.

• C49 high carbon steel for enhanced strength and fatigue resistance
• Heat-treated teeth to resist accelerated wear
• Hand-finished contact surfaces for smoother chain engagement
• Ten quality checks for dimensional accuracy and concentricity

Will the JTR269.45 fit my bike and how accurate is the machining?

JT machines each sprocket to tight tolerances to ensure correct bolt pattern, center hole, and tooth profile dimensions. The JTR269.45 is a 45-tooth rear sprocket; confirm your bike's bolt pattern and chain size before ordering. Accurate machining minimizes vibration and uneven wear when properly installed.

• Precise bolt-hole locations for secure mounting
• True center hole to maintain alignment with the hub
• Consistent tooth profile for predictable chain tracking
• Final QC checks verify fit and finish

How does maintenance and performance benefit from this steel sprocket?

Steel sprockets like the JTR269.45 tolerate impact and heat better than many softer alloys, making them a practical choice for street and off-road use. With proper lubrication and routine chain maintenance, the heat-treated steel holds shape and tooth geometry longer, requiring fewer replacements over time. The hand-finished surface also reduces initial break-in wear.

• Heat treatment preserves tooth geometry under load
• Hand finish reduces early abrasive wear during break-in
• Durable material lowers replacement frequency with correct care
• Works well with standard lubricants and routine chain adjustments

What quality controls and manufacturing steps ensure reliability?

JT Sprockets follows a multi-step production flow: selection of C49 steel, CNC machining to specification, heat treatment, hand finishing, and a comprehensive QC routine. Each sprocket undergoes ten separate inspections covering dimensions, surface integrity, and concentricity. This layered process reduces the risk of premature failure caused by manufacturing defects.

• Material verification for C49 high carbon steel
• CNC machining to tight tolerances
• Controlled heat treatment for consistent hardness
• Ten-point quality inspection before shipping

Who is this for? The JT Sprockets JTR269.45 45T steel rear sprocket is aimed at riders who prioritize durability and consistent drivetrain performance—commuters, weekend trail riders, and anyone replacing a worn sprocket with a robust, serviceable steel option. If you need a reliable replacement that balances wear resistance and cost-effectiveness while matching OEM mounting patterns, this JT sprocket is a practical choice.