Superior Energy Return

For performance carving, your trucks’ suspension system should snap the axles back to parallel as fast as possible when you unweight the edge of the deck. Otherwise you can’t make quick, powerful turns. Because of internal friction (known as hysteresis), the urethane grommets used in roller skate-type trucks soak up and keep most of the energy you put into them, especially if they’re soft or loosely-set. The result is sluggish or sticky axle rebound.

Seismic metal coil springs pop the axles back with lightning speed, powering you out of turns like never before. Propelling yourself with alternating turns (pumping or gyrating) has never been this easy. You might even find yourself pumping from one maneuver to the next…

No Breaking In and No Wearing Out!

Traditional urethane grommets need to break in before you feel comfortable with them, and you have to break in new ones every few months because they wear out so quickly. Grommets also get softer in hot weather and stiffer when it’s cold, so it can be a constant chore to keep them adjusted the way you like. Seismic springs respond perfectly the first time they’re used, and they’ll continue to respond consistently, regardless of temperature, probably for as long as you own the trucks.

If you steer to one direction more than the other, ordinary trucks sometimes start to feel funny, like they “want” to go in that direction. That’s because the plastic cushions and pivot cups can lose their bounce and get warped. Metal springs stay resilient for a very long time, so Seismic trucks will always respond the same way frontside as they do backside.

Those plastic pivot cups wear out, too, and if you don’t replace them your turning performance will deteriorate. The low-friction Seismic pivot system is based on the steel pivot pin and baseplate insert rotating against the German-made Teflon-coated flange bearing inside the hanger. These components will last the lifetime of the truck, without needing any maintenance. The secondary contact between the hanger and baseplate surfaces is naturally self-lubricating.

Why Traditional Grommets will Never Cut it

The grommet-based truck suspension system developed in the 1930s is simply crude and outdated. The grommet collars swing and twist against small side portions of the cushions, instead of pressing directly against the large, flat end surfaces. Even with advanced urethanes, variable durometers, fancy contours, and careful adjustment, traditional grommets can’t react to your weight shifts with the biomechanical precision needed for today’s high-performance skating. They’ll never give you the edge control you deserve.

Unlike metal springs, grommets rapidly lose stiffness and resiliency. Even if you never adjust the kingpin nut, you have to continually re-learn how much edge pressure it takes to make turns of varying sizes. By losing most of the energy you put into them, grommets steal power from your skating, too.

Ordinary grommet-based trucks also force you to sacrifice stability for turning ease. With soft or less-tightened grommets, standard trucks respond too quickly — they can get squirrelly and hard to control, especially at high speeds. With harder or more-tightened grommets, they respond too slowly, losing most or all of their turnability. Most skaters have adapted to one of these trade-offs, and some have even grown to like wobbly or too-tight trucks. But sacrificing either stability or maneuverability means limiting your skating. To let you move beyond those limits, we took a whole new look at truck design.