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Thuekr
gbj_tester
Whatever you like from 20mm* to about 30mm will work, 23 or 25 will probably be optimal aerodynamically. If you're used to 700×25C on a 20mm wide rim, 700×23C tyres should give similar ride and handling on the Flo30 (or other wide rims).
*Don't actually put 20mm tyres on anything apart from the front of a TT or track bike where you're sure that the aerodynamic matching to the rim gives a benefit which makes up for all the detriments.