KTM RC390 415 Lightweight Rear Drive Sprocket

Spears Racing KTM RC390 415 Lightweight Rear Sprocket

The lightest machined 415 rear sprocket for the KTM RC390. Spears Racing engineered this sprocket to handle the constant abuse of racing while cutting rotating mass. It is precision-machined from aerospace-grade 7075-T651 aluminum—not stamped like most competitors. Because it is fully machined, it stays true to the chain and front sprocket with no wobble.

A 53-tooth example weighs just 11.45 oz (324.6 g); actual weight varies by tooth count. The 415 pitch is lighter and narrower than a 520, which is exactly what small-displacement race bikes need for less rotational weight. Do not put a 520 on your race machine.

Key Features

• Machined from highest-grade aerospace 7075-T651 aluminum
• Precision-machined (not stamped) for true alignment and no wobble
• Significant weight savings over OEM and most aftermarket options
• Optimized for 415 pitch chain kits used in racing
• Made in the USA

Proven in Competition
Used by championship-winning teams and riders, including Ben and Jake LeClair (2018 & 2019 CSBK Lightweight Sportbike Champions), Eunan McGlinchey (2018 BSB Junior Supersport Champion), multiple MotoAmerica Junior Cup teams, WSS300 and BSB Junior Supersport competitors, and the 2021 CSBK Lightweight champion. Also associated with lap records at Calabogie.

Spears Racing has spent decades developing race products for platforms that get used far harder than intended. Every component goes through extensive R&D so it exceeds the demands of serious competition.

Lightest Machined Rear KTM RC390 415 Lightweight Sprocket on the Market
Made in the USA