How do you build up motocross wheels?
Answers:
With great difficulty, and skill.
I'd personally take it to a specialist who knows what they're doing.
What do you mean "build up"? Do you mean "lace a wheel? Start out with a hub, rim and a hand full of spokes? If that's it, specify in your next answer. It's a long, complex procedure and I'm not going to type it out if it's not what you're asking.
http://www.dansmc.com/spokewheels.htm.
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