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M_V
gbj_tester
The nominal size is 30mm, which is your target for the bore. The cups are 30.2mm to provide the necessary interference. 30.000mm bore will be very tight and might end up shaving material off one or other component depending on the materials and gauges. It will be OK for steel cups in a thin walled steel head tube, but if the cups are at the upper end of their tolerance, expect to see chips of the softer material if you're combining steel and aluminium🙂