Gotcha, never seen that piece before. And I use superstars on matrix 2’s with 6001rs.
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i don tknow what that is but it looks like a reducer of sorts that goes into the bearing bore… reduces that bore down to what ever fits on what ever axle size you have… “reducer” thats the word im using till someone gives me something better =)
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u do yoga…bruh??
Is that what you guys call shoulder bolts?
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Do you have actual images with this insert on a set of hubs?