Where should frame end height be measured from?

The measurement of frame end height is traditionally taken from a level surface to the bottom edge of the original manufacturer's frame rail. This method ensures consistency and accuracy in assessing the vehicle's frame height because it establishes a clear point of reference that aligns with manufacturer specifications.

Using the bottom edge of the frame rail as the measurement point helps to evaluate modifications or damage to the vehicle's frame, which is crucial for safety inspections. This specific measurement approach is particularly relevant in understanding whether the vehicle meets legal height requirements, which can impact handling characteristics and overall safety.

In contrast, the other measurement points can lead to inconsistencies. For example, measuring from the top of the bumper might not accurately represent the frame's true position relative to the ground, as bumpers can vary significantly in height due to design and aftermarket modifications. Measuring from the ground to the axle may also be problematic because axle height can change based on load, tire size, or suspension modifications, which do not directly affect the frame's integrity or height. Lastly, measuring from the bottom of the tire to the frame could be influenced by tire wear or differences in tire brands, which also detracts from establishing an accurate, standardized measurement for inspection purposes. Thus, measuring from the bottom edge of the manufacturer's