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@Alkali
Square taper bb just means you can specify your axle length, not adjustable as such, there's no spacers so you need to know what you want before you buy it.
external bb is more 'adjustable' (if you really must) because of the three black plastic spacers, shimano bbs will come with an info sheet telling you how to set the spacers correcty in case you want to use a bb mounted chainguide.
The ring will be central if you do as tester says and remove th eouter and inner rings from a three ring chainset