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hi, its one of the racers tricks to use 2.37mm axles in 2.38 bearings less friction, after all its less than 1/2 a thou difference you wouldn,t be able to feel any play in the axle with the 2 bearings in. i doubt that the nsr bearings are 2.37 as this is a like for like fit and the 2.37 axle would have a lot of friction loss. i use 1/8 axles with a .126 bearing hole and thats 1 thou difference and you cant feel any movement in these just a lot less friction when there oiled with 10-40 synthetic oil. hope this answers some of your questions. regards john.
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