Used on a race track. Just replaced with low-friction bearings, and they spin for about 30 seconds each side. Springs and oil are different from the original. (Rear springs are probably G-Force, front unknown. Oil also unknown.) Please note that one wheel hub cannot be removed. The rear damper stay and gear case are glued together (access to the inside of the gear case is possible). There may be other overlooked areas. The second image is a bonus. No price reduction.