Recommended for usage on carpeting and tracks with a top traction, the car rotates better and drives better through corners. Fits both XB4 & XB4 2WD. Aluminum back paid off suspension system system system holders with included Suspension SettingsĀ (I.S.S.) permits fast & easy suspension system system system system geometry environment. This XRAY concept had been introduced toward first XB8 and today finished up being carried to your 1/10 scale XB4. Using eccentric suspension system bushings placed into aluminum suspension system system system obstructs, and additional suspension system shims, the XB4 suspension system system system system geometry may be totally modified.