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It depends on your hub. If it's unsealed, then the ball bearings have different diameters - you just need to find out which size you need. That's fairly easy. If it's sealed, there is going to be a number on the side of the seal - usually a 4 digit number starting with a 6. That number identifies your bearing dimensions, that's the bearing size you need.

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12y ago

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The most common size is 20 inch fir a bmx front wheel. 3/16 inch bearings are the most popular on bmx bikes.

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10y ago
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20 Inch

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15y ago
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Q: What size is the standard bmx wheel?
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