Maintain maximum cutting power, protect your guide bar, and optimize drive performance on your professional STIHL chainsaw with the Genuine OEM STIHL .325" 7-Tooth Rim Sprocket System Kit. Precision-engineered under factory part number 1141 007 1002 (1141-007-1002), this complete clutch drum and floating rim assembly is designed specifically for the modern MS 261, MS 261 C-M, and 1141 series chassis. Replacing a grooved or heat-damaged drive setup with a fresh OEM floating rim system allows your cutting chain to self-align dynamically with the guide bar groove—dramatically reducing side-rail friction, preventing drive link burring, and delivering smooth, uninterrupted power transfer from your engine's clutch.
Featuring the factory-standard 7-tooth (7T) gearing in .325" pitch, this kit provides the ideal balance of high-torque cutting force and chain speed required for professional felling, limbing, and heavy firewood bucking. Built from high-density, case-hardened steel alloys, the floating rim design makes ongoing maintenance simple and economical: when the drive rim shows tooth wear over time, you simply pop off the retaining clip and slide on a fresh rim ring—without the expense of replacing the complete clutch drum hub.
Engineered Specifically for the MS 261 Platform: Unlike older 1121 series sprockets (used on 026/MS 260 models), the 1141 series drum features precise internal dimensions and drive notch alignment calibrated exclusively for the MS 261's clutch assembly and oil pump drive spring. Installing genuine STIHL 1141 drive components guarantees exact drum depth, flawless oiler engagement, and precise needle bearing seating built to withstand daily commercial forestry demands.
Configuration & Fitment Profile: Precision-designed for the STIHL MS 261, MS 261 C-M, MS 261 C-M VW, and related 1141 powerhead chassis configured for .325" pitch guide bars and saw chains. Includes small-spline clutch drum hub, .325" 7T replaceable rim ring, washer, and e-clip. Needle bearing sold separately.
Key Features & Benefits
- Optimal 7-Tooth (7T) Factory Gearing: Delivers maximum pulling torque and engine RPM stability in tough hardwoods and heavy bucking tasks.
- Self-Aligning Floating Rim Mechanism: The replaceable rim floats freely on the splined hub, allowing the cutting chain to automatically line up with the bar groove to reduce friction and bar rail wear.
- 100% Genuine OEM STIHL Construction: Formulated from heat-treated, high-grade steel alloys to resist premature tooth grooving under heavy thermal and physical loads.
- Cost-Effective Replaceable Rim System: Saves money over the life of your saw—simply swap the inexpensive rim ring when service intervals require it rather than replacing the whole drum.
- Precision 1141 Chassis Integration: Features exact drive notch geometry that engages smoothly with the MS 261 oil pump drive wire for continuous, reliable bar lubrication.
Technical Specifications & Master Fitment Chart
| Brand / Component Tier | STIHL® Genuine OEM Chainsaw Drive Line Assembly |
| Factory Part Number / SKU | 1141 007 1002 (1141-007-1002 / 11410071002) |
| Chain Pitch Specification | .325" Pitch Exclusively |
| Tooth Count Profile | 7-Tooth (7T) Small-Spline Rim |
| System Components Included | Clutch Drum Hub + .325" 7T Replaceable Drive Rim Ring + Hardware |
| Verified Compatible Models | • STIHL MS 261 • STIHL MS 261 C-M (M-Tronic) • STIHL MS 261 C-M VW (Arbor / Heated Handle Variants) |
| Primary Application | Commercial Forestry, Heavy Hardwood Bucking, Felling, and Professional Limbing |