Quote:
Originally Posted by Black Dog
Place them on a table next to each other with the smallest cog down. Put them next to each other and look along the plane of the table and you will be able to see the difference in spacing. Once you find out what only one of them is through a part number stamp you will know the speed of each cassette by comparison.
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To add to this - if you can't find part numbers on the back of the largest cog, take a known cassette from your parts bin and lay it side by side with an unknown to compare with the others. I have used this to determine the difference between 9 and 10 speed SRAM.