Marzocchi Bomber Z1 Coil Spring Kit Spring Into Action Do you have a Marzocchi Bomber Z1 Fork and want to change the spring rate to something firmer or softer? Then you're in the right place. The Marzocchi Bomber Z1 Coil Spring Kit is designed to replace your spring with a different spring. The coil comes in four different spring rates including soft, medium, firm, and extra firm. The spring you need will be determined by your overall rider weight. Features Designed for the Marzocchi Bomber Z1Available in four spring rates including soft, medium, firm, and extra firm Different spring rates designed for different rider weights Spring Rate Rate Soft Medium Firm Extra Firm Rider Weight (lbs)120 - 150150 - 180180 - 210210 - 250Rebound (# of clicks from fully closed)13 - 1110 - 87 - 54 - 1 | Marzocchi | Bomber Z1 Coil Spring Kit Extra Firm