The Campagnolo Record 10-Speed Inner Chainring 39T (135 mm BCD) is a precision-engineered drivetrain component intended for riders seeking reliable, smooth pedaling performance on classic 10-speed road builds. Designed to integrate with Campagnolo Record cranksets of the 10-speed era, this inner ring balances efficiency, weight, and durability to maintain consistent chain engagement, crisp shifts, and long service life.

Manufactured to exacting tolerances, the chainring’s tooth profile is optimized for efficient power transfer and consistent engagement with 10-speed chains. This precision ensures that the chain tracks cleanly across the ring, minimizing friction and wear while preserving a smooth pedaling stroke. The result is immediate, responsive drivetrain behavior that feels predictable under load, whether climbing, accelerating, or cruising at tempo.

The 39-tooth size is a classic choice for compact and semi-compact crankset configurations, delivering a comfortable climbing gear while retaining efficient cadence on flats and rolling terrain. Paired with a larger outer ring, it supports a versatile range of ratios suited to varied road conditions without overcomplicating gear choices or sacrificing cadence consistency. Its compatibility with 135 mm bolt-circle diameter (BCD) makes it suitable for a range of Campagnolo 10-speed cranksets from this era.

Construction quality is a hallmark of Campagnolo components, and this inner chainring is no exception. Crafted from a durable aluminum alloy, it delivers a strong yet lightweight platform that resists fatigue over many miles of riding. The material’s resilience helps maintain structural integrity in the presence of consistent pedaling forces while limiting unnecessary weight that can dull drivetrain responsiveness.

Shift performance is supported by carefully shaped ramps and shift aids engineered to promote smooth chain movement between rings during up- and downshifts. These features help reduce hesitation and chatter when changing gears under load, making the chainring a reliable partner in both training and racing environments. While designed for 10-speed systems, it maintains consistent behavior across a range of riding intensities and conditions.

Maintenance and installation are straightforward for mechanics familiar with classic road cranksets. The 135 mm BCD pattern and standardized mounting interface ensure that the chainring fits securely and aligns accurately, preserving chainline integrity and minimizing drivetrain noise or uneven wear. Regular inspection and proper torque application help extend service life and ensure predictable performance over time.

The Campagnolo Record 10-Speed Inner Chainring 39T (135 mm) is best suited for riders restoring or maintaining classic 10-speed Campagnolo builds who want dependable shifting and pedaling efficiency. It reflects the precision and durability expected of high-end Italian drivetrain components, delivering consistent performance across varied road applications.