These frames are made from 1-1/4 in. diameter tubing, mandrel bent (DOM)Frame backbone measures 1-3/4 in. in diameterDesigned for 5-speed transmissions, FXR-styleUse Big Twin forward controls with these framesFlatside fat bob gas tank mounts are welded in placeUse stock Big Twin fork cups and FXE-style fender strutsAvailable with 30 deg. / 34 deg. / 38 deg. neck rakes and front leg stretches of 0 in. and 2 in.