Sitta Front Sprocket Aprilia RS 660 (2020-2026) P004 - 15-17 Teeth, 520/525 Pitch

Long days in the saddle demand drivetrain components that stay precise and comfortable mile after mile. The Sitta P004 front sprocket for the Aprilia RS 660 (2020-2026) delivers exactly that — a precision-machined chrome-molybdenum steel sprocket engineered for smooth, consistent power transfer whether you are threading through mountain passes or pressing on at the circuit.

Key Features

• Chrome-molybdenum steel construction delivers exceptional strength and resistance to wear, keeping the drivetrain running cleanly across thousands of kilometres.
• Available in 15, 16 or 17 teeth configurations, letting you tailor the gearing precisely to your riding style — sharper acceleration or a more relaxed, long-distance cruise.
• Compatible with both 520 and 525 pitch chains, giving you flexibility when building or upgrading your drivetrain setup.
• Precision-machined tolerances ensure a rattle-free fit on the Aprilia RS 660 output shaft, eliminating the play that causes premature chain and sprocket wear.
• Equally at home on the track or the road — the material and tooth profile are chosen to handle the thermal and mechanical demands of both environments.

Choosing the Right Tooth Count

Gearing selection has a direct and tangible effect on how the RS 660 feels beneath you. A 15-tooth sprocket shortens the overall gearing ratio, sharpening throttle response and pulling the engine into its power band more readily — ideal for tight, technical circuits or urban riding where brisk acceleration matters most. Moving to 16 or 17 teeth lengthens the ratio, reducing engine revs at motorway speeds and raising the potential top speed, which suits endurance riding or longer track straights where maintaining momentum is the priority.

Note: The product image currently shown depicts the Sitta P001 front sprocket. A dedicated image for the P004 model is not yet available; the two sprockets share a very similar appearance.

Build Quality and Material

Sitta specifies chrome-molybdenum steel for the P004 because it strikes the right balance between hardness and toughness. The alloy resists surface fatigue under repeated loading, so the tooth flanks retain their profile long after a lesser material would show measurable wear. This protects the chain as much as the sprocket itself — a worn front sprocket is one of the most common causes of accelerated chain stretch, so investing in quality here pays dividends across the whole drivetrain.

Fitment and Compatibility

The Sitta P004 is designed and verified for the following application:

• Aprilia RS 660 — model years 2020 to 2026
• Chain pitch: 520 and 525
• Part number: P004

Specifications