The free length of your spring, paired with other dimensions, may also be elongated to provide you with more travel thus requiring more force. This method is suggested when you need a stronger spring but are under very tight tolerances thus making it difficult to change any other dimension. To know if you’re able to do this with the free length of your spring, visit our online spring calculator and run a design. Look for the values True Maximum Travel and Maximum Travel Considering Solid Height. The maximum travel considering solid height is the amount of travel you’re able to achieve out of your current design with the current free length of spring. The True Maximum Travel, on the other hand, is the travel you would be able to get out of your spring if you made the free length a bit longer. If these two values are the same, you will not be able to make your spring’s free length any longer, but if the True Maximum Travel is greater than the Maximum Travel Considering Solid height, you are able to extend it.