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@bontie
Oh dear, sorry I missed such an obvious thing.
One is 12-25, and Id estimate about 1500miles (i may add that I always change chains well in time so casette is good)
The other is 13-26 and came with a wheelset bought on here last week, no idea of mileage but it looks very very good and runs perfect with a new chain (rode it yesterday)
Hope that helps