I have ordered the Shimano M545 36/22T crank with bashguard. When placing the order and talking with my LBS, we both didn't realize that the crank comes bundled with the SM-BB50 bottom bracket. So I ordered a Shimano SM-BB70 XT bottom bracket for $32 on Amazon along with the crank.
Question is this, do I use the bundled BB or install the one I ordered? What significant difference (if any) is there between the two? Save myself the money or install it?
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