Renthal Grooved Front Countershaft Sprocket (13T / 420 Chain) 307--420-13GP - KTM 65 SX 1998-2009

Product Description

The Renthal 307--420-13GP Grooved Front Countershaft Sprocket is engineered for youth off-road racers seeking maximum drivetrain efficiency and component longevity on their KTM 65 SX. Designed for 420 chain setups, this 13-tooth front sprocket delivers exact gearing delivery needed to handle intense track conditions and high-RPM riding.

Precision CNC-machined from case-hardened and core-refined 655M13 nickel chromium steel, this sprocket delivers extreme strength while maintaining an ultralight design. Specially machined self-cleaning mud grooves at the base of each tooth actively purge dirt, mud, and debris away from the drive contact point, preventing buildup and significantly extending drivetrain wear life under harsh mud conditions.

Top Features: Renthal Front Sprocket

• CNC-machined from case-hardened and core-refined 655M13 nickel chromium steel for exceptional core strength.
• Machined self-cleaning mud grooves at each tooth location to prevent mud buildup and increase wear resistance.
• Ultralight structural profile delivering a 10% to 15% weight savings compared to conventional steel sprockets.
• Engineered specifically for 420 drive chain sizing on 65cc mini motocross machinery.

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: What drive chain pitch does this front sprocket fit?
A: This front countershaft sprocket is designed specifically for standard 420 chain size configurations.

Q: How do the self-cleaning mud grooves function?
A: The machined relief grooves at the base of each tooth force packed mud and debris out of the tooth pockets as the sprocket rotates, reducing friction and chain binding.

Expert Pro-Tip:

Expert Pro-Tip: Always inspect your drive chain and rear sprocket whenever replacing a front countershaft sprocket. Running a new sprocket on a stretched chain accelerates tooth hooked wear instantly. When securing the new front sprocket, clean the countershaft splines thoroughly, verify smooth fitment, and re-install the retainer clip or bolt with proper threadlocking compound.

Recommended Pairings:

• KTM 65 SX Performance Parts & Upgrades
• KTM 2-Stroke Dirt Bike Performance Parts
• MX & Off-Road Drive Chains

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