Standard front spring and 1/2″ or 5/8″ rear spring, you choice of gauge. Springs are one of the most important parts of the machine. They determine a machine’s character, and ultimately how it will perform in different situations. Our expanded line of spring gauges will allow you to find just the right combination. 5/8″ Available in 16 ga, 18 ga and 20 ga. Springs sold in sets have matching gauges.