Stihl .325" 8 Tooth Rim Sprocket Kit - MS260, MS270, 026

Maximize cutting performance, increase chain speed, and reduce bar wear on your professional or mid-range STIHL chainsaw with the Genuine OEM STIHL 0.325" 8-Tooth Rim Sprocket System Kit. Manufactured under factory part number 1121 007 1038 (1121-007-1038), this complete drive rim and clutch drum assembly is engineered to replace worn drive spur sprockets or renew existing floating rim setups. Switching to a floating rim system allows the saw chain to automatically align itself perfectly with the groove of your guide bar, minimizing side-load friction, preventing premature drive link wear, and delivering exceptionally smooth power transfer from your engine's clutch.

Featuring an 8-tooth (8T) sprocket configuration in .325" pitch, this upgrade system steps up your cutting speed compared to standard 7-tooth rims, allowing high-revving powerheads to slice through wood faster during limbing and light felling. Built from case-hardened, high-grade steel alloys, the replaceable rim design means when the sprocket teeth eventually wear down, you simply slide off the worn rim ring and pop on a fresh one without needing to replace the entire clutch drum assembly—saving you time and maintenance costs over the life of your saw.

True Genuine OEM Precision vs. Cheap Aftermarket Drums: Critical drive line components like clutch drums and sprockets endure extreme centrifugal forces and thermal stress. Low-grade aftermarket drums often suffer from out-of-round machining, loose needle bearing tolerances, and soft metal teeth that wear prematurely or shatter under load. Genuine STIHL drive components guarantee exact clutch drum depth, precise needle bearing seating, and hardened drive splines that hold up to heavy daily use.

Configuration & Fitment Profile: Precision engineered for STIHL mid-range saw platforms running .325" pitch guide bars and chains. Directly compatible with the clutch and drive systems of the iconic 026, 026 Pro, MS 260, MS 260 Pro, as well as the oil pump and clutch drives of the MS 270, MS 270 C-B, and MS 280 series.

Key Features & Benefits

• High-Speed 8-Tooth (8T) Architecture: Increases chain drive speed over standard 7-tooth sprockets, offering faster cutting performance in clean softwoods and limbing applications.
• Self-Aligning Floating Rim Design: The rim slides freely on the splined drum hub, allowing the chain to float into perfect alignment with the bar groove for reduced friction and extended bar life.
• 100% Genuine OEM Construction: Built to exact STIHL factory tolerances using high-density, heat-treated steel to resist premature tooth grooving and wear.
• Cost-Effective Maintenance: Saves money over time—when the rim wears out, simply swap the inexpensive rim ring rather than replacing the complete drum assembly.
• Smoother Cutting Action: Reduces vibration and chain binding compared to worn fixed-spur sprockets, delivering a noticeably cleaner cut.

Technical Specifications & Master Fitment Chart