Here is a new OEM Oregon power mate Sprocket drive rim - 9 tooth .325 pitch. Large 7 spline.This is part# 13624.With 9 teeth,it will make the chain turn faster, but will require an extra drive link. Oregon rims have wear depth indicators to tell when to replace. It fits large 7 spline sprockets. Oregon makes a standard 7 spline and a small 7 spline. If a penny fits inside the rim- it is a small 7 spline. If a nickel fits inside - then it is a standard 7 spline. Make sure to buy the correct one. Pictures are of the actual item and capable of describing this item better than words.
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