Overview
This aftermarket sprocket rim serves as a direct replacement for the factory unit on your chainsaw. The sprocket rim meshes with the chain drive links to transfer power, so when the teeth wear down and the chain begins to skip or derail, cutting performance and safety both suffer. Swapping in a fresh replacement restores reliable chain drive and helps protect the rest of the drivetrain.
Key specifications
- Pitch: .325”
- Teeth: 7T
- Material: hardened steel
- Type: aftermarket replacement
Compatibility
This kit is compatible with STIHL 026 024 025 MS280 MS250 MS 260 and similar models from the same product family. Verify your chainsaw’s model number before purchasing to ensure the sprocket pitch and drum bore match your saw.
Installation notes
Pop off the clutch cover, remove the bar and chain, and slide the old rim off the drum. Drop the new rim onto the drum splines, reinstall the bar and chain, and set proper tension. A new rim should always go on with a new chain to prevent accelerated wear on both parts.
Common questions
Q: Will this .325” 7T 17mm sprocket drive rim kit fit my STIHL MS250 and MS251, or is it only for older 024/026 saws?
Yes, this kit is intended for the STIHL models listed, including MS250, MS251, 024, 025, 026, MS260, MS270, and MS280, as long as your saw uses the Mini 17mm rim setup. The most important match points are the .325” pitch, 7-tooth rim, and 17mm clutch drum/rim size.
Q: Can I use this 7-tooth .325 rim on my STIHL 026 if I’m already running a .325 chain, or do I need to change the bar and chain too?
If your 026 is already set up for .325” chain, this 7T rim should work without changing to a different pitch. You just need to make sure your bar sprocket and chain are also .325”, because the drive rim, chain, and bar tip all need to match pitch.
Q: How often should I replace the sprocket rim in this 3-piece kit, and is there anything I should check during installation?
A rim should usually be replaced when you see noticeable groove wear, hooking on the teeth, or when installing a couple of new chains after extended use. During installation, inspect the clutch drum, needle bearing, and washer/clip hardware, and apply a light coat of grease to the bearing so the rim spins smoothly.
