Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
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FastJake is correct! You can almost definitely get a new crank and BB assembly that will be a direct replacement for your square taper crank and BB.
However, the actual advantage of this is pretty much negligible and gives no real advantage that you can notice in terms of speed or efficiency. If you are replacing the crank for some other reason, like swapping to a double or because the exisisting one is damaged then it makes sense, but not as an 'upgrade,' so called.