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The difference is the size of the hole in the center of the bearing. A 19mm bottom bracket will fit a 19mm crank spindle (profile cranks have a 19mm spindle). A 22mm bottom bracket will have a hole in the center that is 22mm. a 22mm spindle (eclat tibia cranks have a 22mm spindle) will fit in the 22mm bottom bracket. The size of the bottom bracket needed depends on the size of your crank's spindle size.
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Ross
ReneThe difference is that a 19mm is about acouple ounces lighter than a 22mm so every ounce counts in bmx though, oh and for a 175 mm i think you said, get the 19mm it'll work good luck!1
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