The Yokomo BB-126N-4 6x12 bearings are supplied as a narrow heavy-duty four-piece set designed for use with ZM-415SH. These bearings suit narrow hub locations and are sold as replacement parts for the listed model for RC wheel and drivetrain applications only.
Fitment is limited to ZM-415SH as indicated; do not presume suitability for other hubs or chassis without verification. During replacement, check the hub bore, align the bearing correctly, seat each unit evenly, and replace all bearings together to keep wheel rotation balanced and handling consistent.
In setup terms, choosing a heavy-duty narrow bearing set improves load handling and service life at wheel or gearbox contact points; expect consistent rotational behavior where narrow bearings are required, and inspect adjacent clearances before final assembly.
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