Marzocchi Bomber Z1 Coil Fork Spring Kit So you have the Z1 Bomber Fork and want to upgrade it to the coil spring version? Or maybe you bought the Z1 Coil version but the stock medium spring rate doesn't fit your weight or riding style. Don't worry, we got you covered. With the Marzocchi Bomber Z1 Coil Fork Spring Kit you can choose from four different spring rates to upgrade your fork. Make sure to refer to the spring rate chart to determine the correct spring rate for your weight and fork travel. Features Available in four spring rates. Upgrade your Z1 to a Z1 coil fork. You'll have to also purchase the top cap and plunger kit. Spring rates are determined by rider weight and riding style. | Marzocchi | Bomber Z1 Coil Fork Spring Kit Medium