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@wot
Cx-70 and cx-50 are pretty much identical to setup.
Cx-70 come up on eBay pretty infrequently, if buying 2nd hand check that they come with a full set of spacers and associated screws. Those parts are now expensive as spare parts.
Apart from the colour, cx-70 have the advantage of using cartridge brakes so any road r55 pad will fit.
The chart in the setup table for the cx-50 / cx-70 is identical, note that for wider wheels you may have to extrapolate to figure out which is the optimal set of spacers.
https://si.shimano.com/pdfs/dm/DM-RCBR001-00-ENG.pdf