Seismic G5 45-Degree Spring Truck

Rated 5.00 out of 5 based on 4 customer ratings
(4 customer reviews)

$45.00$50.50

180mm faced Hanger with 45-degree Baseplate in stone finish.
Choice of Solid or Hollow axles, Springs in four (4) strength options.
Price is for a single truck.  Order two (2) trucks for one skateboard.

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SKU: G5_45D Categories: ,

Description

Seismic® G5™ 45-degree Spring Truck
180mm faced Hanger with 45-degree Baseplate in stone finish.
Choice of Solid or Hollow axles, Springs in four (4) strength options.
Price is for a single truck.  Order two (2) trucks for one skateboard.

General setup suggestions
For optimal traction, power, and control, we usually suggest a 45-degree truck at the nose and a 30-degree truck at the tail, with stiffer springs at the tail than at the nose. Use two 45-degree trucks on symmetrical (twin-tip) freeride decks. Use stiffer springs if you’re heavier and/or taller than average, softer springs if you’re lighter and/or less tall.

The original precision longboard truck – five generations later!
A major upgrade to our flagship high-rebound truck technology.

Power, stability, maneuverability, and control since 1993

No truck has more energy return, more precision, or better steering control. The world’s best for pumping!

Stronger, lighter, and better-looking

Our crack team of engineers and industrial designers scoured every cubic millimeter of the previous (G4) model – looking for material to trim and spots to toughen, all while improving aesthetics.

More precise Spring System

Breakthrough Spring Cap design keeps Springs much straighter as they compress – resulting in a larger turning range and enhanced steering control.

Easier maintenance and better Pivot Bolt fastening
Thicker, stronger Pivot Bolt is easier to remove and install, and it threads more securely into a larger Baseplate Locknut. Stronger, reusable Pivot Bolt Clip is easy to remove and install by hand, and it’s fastened to a rubber “leash” that prevents it from ever getting lost. Ingenious new multi-part Baseplate structure creates uniform thickness at mounting corners, so you need mounting bolts of only one length.

Most components backwards compatible with older models
Exception: G5 Pivot Bolts, Baseplate Locknuts, and Pivot Bolt Clips will not fit older (G4) baseplates; and older (G4) Pivot Bolts, Baseplate Locknuts, and Pivot Bolt Clips will not fit G5 Baseplates.

Mounting
Seismic G5 baseplates require full surface support, so they should not be top-mounted on decks with drop-through mounting holes unless stiff riser blocks are placed between the trucks and the deck. Because of their unique baseplate structure, G5 trucks will not fit through standard drop-through mounting holes, either.
G5 trucks should also not be mounted on top of rubber or urethane shock pads. These amplify stresses on the baseplates, especially if the mounting bolts are over-tightened or tightened unevenly. Then relatively minor impacts can push the baseplates past their breaking point.

Axle Height, Axle Offset, and Roll Center

Axle Height: 59.5mm / 2.34 inches from baseplate bottom to axle midpoint
Axle Offset (Rake): 14.0mm / 0.55 inches
Roll Center: 16.2mm / 0.64 inches above axle midpoint
More Axle Offset (or Rake) pushes the Roll Center higher (towards the deck), resulting in quicker lean response and better wheel traction.  Less Axle Offset (or Rake) leaves the Roll Center lower (near the axles), resulting in better lean control and stability.

4 reviews for Seismic G5 45-Degree Spring Truck

  1. Rated 5 out of 5

    What can I say – these trucks are a work of art.

    I have an engineering background and a general appreciation for well engineered products, and these are light years ahead of any other truck I have seen and/or used.

    They are very precise, tune-able, and have none of the squishy feel of the bushing-style trucks I have seen or used. My son has the previous version of these on his board and they are also great. Nobody in our area has ever seen a Seismic truck, so they have a bit of novelty to them as well and people are curious what they are.

    Customer service from this company is exceptional as well. One of the small c-clips was broken upon arrival, and some spares were sent out to me immediately.

    I also purchased a set of 85mm Speed Vent wheels and Tekton bearings with these trucks, and all of the products from this company are excellent.

  2. Rated 5 out of 5

    The trucks are amazing. I’m running the 30* in back and the 45* up front. Installed them on my carving setup with purple springs on 30 and light blue on 45. After reading lots of forum posts on them, I decided to take the plunge. I wanted a more progressive lean that provided excellent feedback. My expectations were blown away. I’ve still got setups on bushings, but they are collecting dust. Carving is what I bought the trucks for and they deliver.

    A quick note about the customer service, because to me, this is what gains my loyalty. I had a question about my setup, which was answered in less then ten minutes by Dan himself. LESS THAN 10 MINUTES! His answer helped me dial in the setup that I wanted, and with the installation of some risers, I was on the street as soon as my package arrived.

    Seismic is a great product with great people behind it. They’ve made a loyal fan out of me and I bet they do the same for you.

  3. Rated 5 out of 5

    LUV!!! Now I need some 30′ but these simply rule and I could not have picked better tech to support my ride.

  4. Rated 5 out of 5

    LUV!!! Now I need some 30′ but these simply rule and I could not have picked better tech to support my ride.

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Truck Axle Tolerance

Seismic axles (both G5 and Aeon) are manufactured to be 7.95mm in diameter, with a small negative-only tolerance. Racing truck makers who advertise “true 8.0mm axles” generally follow a similar specification. Average brands use 5/16-inch (7.9375mm) axles.

The inner race of standard wheel bearings has a diameter of 8.0mm, with a small manufacturing tolerance. Truck axles need to have a diameter slightly smaller than that, or else some bearings may not fit or even get stuck.

Truck Hole Pattern

Seismic trucks (both G5 and Aeon) support both “Old School” and “New School” mounting hole patterns. In the case of the G5, this was a significant engineering challenge given the truck’s unique structure.

The Old School mounting hole pattern has holes that are 2.50″ (63.5mm) center-to-center longways. In the New School hole pattern, that distance is only 53.5mm (2.11″). Both patterns have holes that are 1.625″ center-to-center sideways.

G5 Truck Mounting

Seismic G5 baseplates require full surface support, so they should not be top-mounted on decks with drop-through mounting holes unless stiff riser blocks are placed between the trucks and the deck. Because of their unique baseplate structure, G5 trucks will not fit through standard drop-through mounting holes, either.

G5 trucks should also not be mounted on top of rubber or urethane shock pads. These amplify stresses on the baseplates, especially if the mounting bolts are over-tightened or tightened unevenly. Then relatively minor impacts can push the baseplates past their breaking point.

G5 Spring Truck Dis-assembly and Re-assembly

To dis-assemble a G5 truck: Place the board or truck upside-down, on the floor or a low workbench. Always pull off the bolt clip and untighten the spring adjusters. Then press down on the hanger and hold while unscrewing the pivot bolt. (Note: If you don’t untighten the spring adjusters and hold the hanger down, spring pressure adds resistance to unscrewing the pivot bolt and creates stresses that can strip the threads of the baseplate nut as the bolt is removed.)

To re-assemble a G5 truck: Place the board or truck upside-down, on the floor or a low workbench. Always make sure to fully loosen the spring tension screws. Otherwise much more pressure is needed to align the hanger and baseplate for insertion of the pivot bolt.

Set the springs in the baseplate with the sliding “piston” caps facing up. Place the hanger on top, with the spring adjuster tips inside the piston cap sockets.

Press the hanger down and hold it in place (using your bodyweight if necessary), to align the parts and keep spring pressure off the pivot bolt. Then use a 7/32″ Allen wrench to press the bolt through the truck and screw it into the baseplate nut. Fasten firmly, but don’t over-tighten. Sometimes a small downward push with the wrench helps the bolt tip catch the threads of the nut.

Always re-attach the bolt clip after re-assembling a G5 truck. Replace the clip if it becomes bent.

If the pivot bolt unscrews only partway during disassembly and then gets stuck, the nut is probably stripped. To get the pivot bolt out of a stripped nut, first place the truck in a vice (if possible). Pound the head of the bolt back into the truck. This will force the stripped nut out of its pocket in the baseplate. Then slide a small flathead screwdriver (preferably #3) between the nut and its pocket, or grasp the nut with a strong pliers. This increases tension between the pivot bolt and the nut, and it usually helps the bolt cut through the nut’s stripped threads. After unscrewing the bolt, reassemble using a fresh bolt and nut.

G5 Spring Truck Noise

Seismic G5 Spring Trucks were engineered as a high-precision product, with virtually no slop in their steering articulation. So like a race car, they don’t dampen road vibrations much and may seem noisy compared to lower-precision trucks that use bushings. Some skaters are more sensitive to that than others.

Actual rattling noises can occur for a variety of reasons, regardless of the trucks you’re using. The most common cause is riding on rough surfaces with loose hardware, no shock pads under the trucks, and/or wheels that are too hard for the surface. In addition, bearing spacers can rattle between the bearings or against the axles if they’re the wrong size, or if the wheel core tolerances are off.

Try using softer wheels with properly-spaced bearings, and truck risers made of urethane or hard rubber. Also check the fastening tension of your mounting hardware, wheel nuts, and truck pivot bolts. (Loose pivot bolts can also invite dirt and grime to gunk up the works, which in turn can lead to excess friction among the moving parts.)

The Seismic G5 technology itself was carefully engineered to eliminate squeaking, clicking and rattling, but a few seldom-seen issues can lead to these or other noises.

Most squeaking and clicking stems from friction between the small inner springs, the main outer springs, and the long-necked “sliding” spring caps. To reduce or eliminate the noise, try rotating the spring assemblies a quarter or half turn inside the spring chambers. (Loosen the tension screws first, then just turn the springs with your fingers.) After that, tighten the tension screws at least 1.5 turns. For added measure, drop a bit of silicone or graphite lubricant inside the long spring caps.

Finally, spring tension screws that are fully loosened may occasionally rattle inside the Seismic truck hangers, though ordinarily spring pressure keeps them quite still. Try tightening them 1.5 turns. This puts them in a “neutral” position where they function as intended. The trucks won’t feel stiffer when riding, but pressure from the springs will keep the screws from rattling.

Truck Wedging

The steering geometry of the Seismic G5 Spring Truck is absolutely fixed and perfectly consistent – either 30-degrees (Stable-Turn) or 45-degrees (Quick-Turn). The steering geometry of the Seismic Aeon Truck is also very consistent, especially for an RKP design. So wedged (angled) risers have a totally direct and predictable effect on their performance.

To quicken steering response, orient the wedge with the thin end facing the end of the deck. Usually called “wedging,” this is most commonly done with the front truck. Just remember this reduces your leverage on the G5 springs or Aeon bushings, so you might want to loosen them or even switch to softer ones.

To slow steering response, orient the wedge with the thick end facing the end of the deck. Usually called “de-wedging,” this is most commonly done with the rear truck, especially on racing boards. Just remember this increases your leverage on the G5 springs or Aeon bushings, so you might want to tighten them or even switch to stiffer ones.

Optimal truck mounting depends on many different variables – wheelbase, riding speed, skating style, personal preference and even body height. You’ll need to experiment to see what works best for you.

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