The Flying Scot
Join Date: Aug 2001
Location: North Queensferry Scotland and London (and France)
Posts: 1,904
Bikes: Custom (Colin Laing) 531c fast tourer/audax, 1964 Flying Scot Continental, 1995 Cinelli Supercorsa, Holdsworth Mistral single speed, Dahon Speed 6 (folder), Micmo Sirocco and a few more
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Cross gears increase wear on your chain and presumably would also cause uneven wear on your rear block. It might be however that the shapes you noticed are modified teeth to "ramp " the chain when changing.
On both my road bikes the middle rear cog wears before any of the rest (I can feel it through the pedals) because that's the gear I use most with my 52 front
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plus je vois les hommes, plus j'admire les chiens
1985 Sandy Gilchrist-Colin Laing built 531c Audax/fast tourer.
1964 Flying Scot Continental (531)
1995 Cinelli Supercorsa (Columbus SLX)
1980s Holdsworth Mistral fixed (531)
2005 Dahon Speed 6 (folder)
(YES I LIKE STEEL)
2008 Viking Saratoga tandem
2008 Micmo Sirocco Hybrid (aluminium!)
2012 BTwin Rockrider 8.1