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Stacked official word:
ThisTheory bikes American Bottom bracket parts to mid BB cup is made for any frame that has an American bottom bracket and installing cranks with a 19mm, 22mm or 24mm spindle. The mid bearing pops in these aluminum cups and allows you to run a 19mm, 22mm, or 24mm sealed bearings. Most American BB frames have unsealed bearings and 1 piece cranks. So for anyone who is upgrading from the 1 to 3 piece cranks, this is the perfect starting point. Just be sure you get some bearings that match your spindle size and you’ll be all set.

Theoryword:
TBA

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***Every Online order comes with a bunch of stickers and FREE stuff from your favorite brands. The more you order the more we throw in. Stacked Always giving back.