I have a similar setup on a LeMond Poprad that I use as an "all-road" bike. The CX8.4 brakes work fine with Shimano ST-5800 levers. As others have noted, older cross bikes with comparatively narrow brake post widths place the brake arms in non-vertical positions when wider rims are used. I partially compensated for this with spacer placement. On the whole, my braking power/modulation are good.
Greg
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