Front fork softness can be determined by the SAG value. Support changes are mainly due to two reasons: the spring and the fork oil. If the fork oil is impure or degraded, it can cause damping decline or failure. Springs need to be replaced if they decline and support worsens. Simple comparison of the new and old spring lengths can indicate spring decline. CCD inner tube kit springs are made of imported silicon-chromium alloy steel, which is high temperature and fatigue resistant.