FR 4D 255mm 4×84 165 Flat Inline Frames

FR 4D 255mm 4×84 165 Flat Inline Frames. The FR 4D 255mm frames are ideal for those who want a strong freeride 4-wheel frame with 84mm wheels. The FR 4D Flat frames are compatible with almost all FR, Micro, and Seba inline skate boots and with a lot of Rollerblade inline skate boots (and among them the Rollerblade Twister models). The frames have a flat set-up (all four wheels touch the ground at the same time).