Oregon Power Mate Rim & Drum System (3/8" x 7) for Stihl 029, 034, 036, 039, MS 290, MS 310, MS 340, MS 360, MS 390
This professional drive system includes a splined drum (clutch cup) with a replaceable rim. The rim floats freely on the spline, allowing the saw chain to align with the groove of the bar. Comes complete with 3/8" x 7 tooth spline. Drive sprocket bearing sold separately.Fits the following chainsaws:Stihl 029, 034, 036, 039 MS 290, MS 310, MS 340, MS 360, MS 390Replaces Part Number 1125 007 1002, 1125 007 1041 and 1125 007 1000Fits Crankshaft Diameter .3937 (10mm)Drive Sprocket Bearing ORF 37325 (10x13x10)Rim Spline Size Small 7 tooth (RSS)Optional Replacement Rim Pitch and Tooth Choices (sold separately)  ORF 11892 325" x 7ORF 11891 325" x 8ORF 18720 375" x 7