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Outside to outside, i.e. where the edge of the swingarm touches on each side. You could bypass purchasing calipers by using a couple of straight edges and measuring thru the wheel the distance between the straight edges. Of course, someone (Wife?) else would need to hold the straight edges in place, while you measure.
You probably should measure each individual component, bearings, etc.
I would lean more toward purchasing a 45T 650R sprocket, thus no filling and drilling. Also, buy the bearings mentioned that allow using the bearings without the sleeves....minor money.
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