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The point of all these changes was losing weight, which works and sells a lot of bikes. Square taper is heavy, splined was lighter, UT lighter still and 30mm aluminum spindles really light.
BB30 is stupid easy to adapt, and there isn't a really a weight penalty for doing so. In the case of UT, it is a substitution of one factory cup for another. What's the downside to a BB that is lighter and slimmer than any other, but totally backwards compatible?
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