Rear Sprocket for KTM Duke 390 Steel
MREV-P-000064Steel rear sprocket for KTM Duke 390: CrMn 5045 steel at the teeth that engage directly with the chain. Select a tooth count and sprocket carrier suitable for the bike. Durability also depends on chain condition and maintenance.
The steel rear sprocket for KTM Duke 390 engages the chain through its teeth. For the steel version on Duke 390, check the bike's chain size before ordering.
Steel sprocket characteristics
The sprocket is CNC-machined from CrMn 5045 steel, with steel teeth carrying the chain's pulling load directly. This option suits riders who prefer steel in the area that repeatedly engages with the chain. A steel sprocket may weigh more than an aluminum sprocket of the same dimensions. In return, it provides the steel-tooth construction required for the application. An excessively worn chain or incorrect chain slack can still cause rapid wear on a new sprocket.
Selecting tooth count and chain size
The final drive ratio is calculated by dividing the rear sprocket tooth count by the front sprocket tooth count. Retain the existing rear tooth count when replacing worn parts, or select a different count if you want to change the final drive ratio and have checked the chain length. This model is available with 45 teeth. This product uses a size 520 chain. Check the markings on your bike's chain.
Checking the rear wheel assembly
If fitting a new rear sprocket with an old, worn chain and front sprocket, assess the condition of the entire drivetrain. A photo of the sprocket's back face after removal shows the center bore and bolt circle. Compare the carrier seating face as well to determine whether the replacement maintains the correct chainline.
Compatible vehicle models for Rear Sprocket for KTM Duke 390 Steel
Recorded gearing options
Only recorded pitch, position and tooth options are shown. Final-drive changes must be evaluated against the complete front/rear setup; tooth count alone is not treated as a performance claim.