Tuning
Seismic trucks are easy to adjust and maintain after you spend a few minutes learning how. All you need are the standard Allen wrenches (included) used to mount trucks and tighten kingpins.
Mounting to Deck
Front and rear springs should face each other.
Adjusting Spring Tension
Adding tension to springs increases turning stability. Turn screws at rear
of hanger using 1/8" Allen wrench. Adjust both sides equally (max five turns).
If in doubt, fully loosen screws, then synchronize while re-tightening.
Optimal adjustment depends on bodyweight, deck width, skating speed, and personal preferences. For best results, tighten springs at least 1/2-turn, but not more than three turns.
Feeling adventurous? Asymmetric adjustment can improve carving control, stability and power. Try more tension (or even stronger springs) under your rear heel and front toe.
Note: Always keep pivot pins firmly fastened in baseplates. Adjust only the spring screws. If screws are fully loosened or tightened, forcing them further will damage trucks.
Switching Springs
First, fully loosen spring adjustors. Remove safety clip from end of pivot pin, then unscrew using 7/32" Allen wrench. Press down on hanger as you do this (springs are under pressure). Lift off hanger, remove old springs, and set new ones in baseplate (sliding “piston” caps facing up). Press hanger back in place, then reinsert pivot pin. Push head downward to help the tip catch threads of baseplate locknut. Fasten firmly (but don’t overtighten). Finally, always reinstall safety clip (replace if original is bent).
Note: Simply unscrewing pivot pin will force off safety clip, but this usually leaves clip badly bent. In this case replace with fresh clip (included with spring kits). To reinstall clip, place it on pivot pin groove by hand, then use a hard narrow object (like a wrench handle) to snap it into place.
Safety and Maintenance
Always check wheel nuts, pivot pins and mounting hardware before skating. Replace worn nuts, and replace hangers if ground down to axles. Add stability for high-speed skating – tighten trucks, switch to heavier springs, and/or decrease steering geometry with angled risers. Note: Dewedging increases your leverage on the springs, so consider tightening them and/or switching to stiffer ones.
Do not use for extreme downhill or luge unless you are an experienced racer and you meticulously check equipment for safety and stability before every run. Note: Speed wobbles are an inherent risk. No truck manufacturer can guarantee against them. (See “The Low-Down on Speed Wobbles”, by Daniel Gesmer, in International Longboarder magazine, Spring/Summer 2000, p. 18.)
Observe all traffic and pedestrian safety rules, and wear protective safety gear.