DaveReading
Don't suffer fools gladly (must try harder!)
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The spec for my tourer, when I bought it a couple of years ago, listed a Shimano HG31 11-32t (8-speed). My cassette does indeed have smallest and largest sprockets of those sizes, but as I found out when I was doing some sums on intermediate ratios, the other sprockets are somewhat unevenly spaced (11-12-14-16-18-21-26-32) and don't seem to match the published Shimano docs for any of their cassettes.
I can't see any obvious branding on the it, either Shimano or SRAM, but if it helps it has a black finish and most of the larger sprockets are rivetted together (though I'm about to split them to clean them properly). The spacing and appearance seem to match that of the SRAM PG820 (see www.bikeman.com/FW6187.html).
If I do go for a more evenly spaced 11-32t, the Shimano HG31, HG40 and HG41 all come in a 11-13-15-18-21-24-28-32t "aw" option. What's the difference between these three?
I can't see any obvious branding on the it, either Shimano or SRAM, but if it helps it has a black finish and most of the larger sprockets are rivetted together (though I'm about to split them to clean them properly). The spacing and appearance seem to match that of the SRAM PG820 (see www.bikeman.com/FW6187.html).
If I do go for a more evenly spaced 11-32t, the Shimano HG31, HG40 and HG41 all come in a 11-13-15-18-21-24-28-32t "aw" option. What's the difference between these three?