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The Bos springs have benn developped to feature the best ratio stroke / weight, by reducing the lenght at the minimum. By the way the springs are so competitive that the "steel solution" is better, or at least similar as the "titanium solution"... which remains way more expensive !
If you want to purchase a spring for your Bos fork, you will have to choose it by using the table below. It indicates which color you have to use, depending of your weighyt and the fork you use. Then, just select the color to place your order !