Old 01-25-20, 12:05 PM
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I agree with Marcus Ti on all of the above. The only real benefits to T47 are putting the bearings back into the shell and the ability to use a down tube larger than 38mm. For some off road and larger sized frames, a down tube larger that 38mm is desireable, but it just doesn't work too well to try to attach them to a 38mm BSA shell without squashing them into an oval. The current crop of T47 bottom brackets are very expensive, as are the necessary taps for chasing the threads. If the standard doesn't catch on, you'll be left with a frame that you can't find bottom brackets for.
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