FR 4D 243mm 80mm 165 Flat Inline Frames

FR 4D 243mm 80mm 165 Flat Inline Frames. The FR 4D 243mm frames are ideal for those who want a strong freeride 4-wheel frame with 80mm wheels. The FR 4D Flat frames are compatible with almost all FR, Micro, and Seba inline skate boots, as well as many Rollerblade inline skate boots (including the Rollerblade Twister models). These frames have a flat setup (all four wheels touch the ground at the same time), so they will provide very good stability and balance.