The Yokomo BB-126N-4 6x12 bearings arrive as a four-piece narrow heavy-duty set intended specifically for ZM-415SH hubs. Sized for narrow hub applications, these bearings are offered as replacement units for the stated model and are intended for RC wheel and drivetrain use only.
Compatibility is restricted to ZM-415SH as listed; do not assume fitment with other hubs or chassis without checking. When changing bearings, verify the hub bore and bearing orientation, press each bearing in squarely, and replace the entire set to preserve balanced wheel rotation and predictable handling.
From a tuning perspective, fitting a heavy-duty narrow bearing set increases load capacity and durability at wheel or gearbox interfaces; expect steady rotational support where narrow bore bearings are specified, and confirm clearance to nearby parts before final assembly.
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