13/64th grinding wheel or 3/16" for stihl chain

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Pulp Friction

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I bit the bullet and ordered an Oregon 511AX to sharpen chains on both of my saws, an MS290 (.325 pitch) & MS441 (3/8" pitch) . The ms290 uses a 3/16" file and the ms441 calls for a 13/64" hand file. However, the closest size wheel that the chain grinder comes with is a 3/16 wheel. I see that 5.2mm wheels can be bought for other purposes, and is the same size as the 13/64. My question is, do I grind a Stihl 33RSC chain with a 3/16" wheel or do I need a 5.2mm?
 
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