We investigated the magnetic properties of the modified pyrochlore fluorides ACr(2)F(6) (A = Rb and Cs), which consist of antiferromagnetically interacting Cr3+ and Cr2+. Both systems have Curie-Weiss temperatures of about -40K and exhibit magnetic ordering at about 17 K. Below the ordering temperatures, RbCr2F6 has a small spontaneous magnetic moment but not CsCr2F6. In a magnetic field, they exhibit a change in the slope of their magnetization curves at about 3 T, which is likely to be due to a spin flop. In addition, we found field-induced magnetic transitions of RbCr2F6 at 25 T, where it has a magnetic moment of about 4 mu(B) per formula unit. The spin structure at about 25 T is considered to be a collinear one, in which all Cr2+ ions and half of the Cr3+ ions are aligned parallel to the field and the other half of the Cr3+ ions are antiparallel.