Seismic Defcon Barrel Bushings


Pair of two (2) barrel bushings.

    • per pair
    • additional
    • additional
SKU: BRL_BSH_DEF Categories: , , ,

Seismic® Defcon™ Barrel Bushings
Deeper Lean with Truer, More Fluid Steering • Finer Control and Highly-Energetic Response • Precision Fit
Available in five (5) color-coded durometers and two (2) precision-fit heights. (Additional duros coming early 2023.)
Price is for a single pair of two (2) barrel bushings. Discounted pricing for Bundle of all duros in a single height.

Seismic’s Defcon ultra-high-rebound urethane has a remarkable set of unique and highly-advanced properties – and now we’ve applied it to bushings! Defcon is the fastest wheel formula in the history of skateboard racing – credited with virtually every significant world distance and speed record, including the official Guinness Standup mark. (Pete Connolly, 91.17 mph / 146.73 kph – Sept. 16, 2017, at The Top Speed Challenge in Quebec, Canada.)

A major step forward in bushing performance…
Deeper lean and truer, more fluid steering with less lateral hanger slop!
Highly-energetic yet smooth and controlled return-to-center
Larger compression range compared to other bushing formulas in the same duro – No premature packing • Fuller wheel contact (less “outside wheel lift”)
• Smoother, more linear resistance profileConsistent feel • Advanced control

Fine-tuned dimensions for high-performance fit!
Full 1.0-inch Outer Diameter optimizes seating in finer Hanger bushing pockets.
• Inner Diameter carefully calibrated for snug fit on standard Kingpin shafts.
• Mold-top ends machined for exact height and superior flatness. – No “dished” end surfaces.
• Two precision-fit heights…
Medium 0.65-inch (16.5mm): Optimal height for most modern longboard trucks. May fit and perform best without bottom / boardside washer (usually not needed).
Tall 0.75-inch (19mm): Optimal height for most specialty race trucks. May fit and perform best without bottom / boardside washer (usually not needed).

Note: May feel slightly softer than comparable duros in other bushings. For optimal bushing performance, do not under-tighten or over-tighten kingpin nuts. Replace bushings that show signs of excessive wear, weathering, or aging.


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The Science Behind DEFCON Urethane

Modern urethane is composed of three basic ingredients:
• Small hard molecules (called chain extenders or cross linkers) that form a tough skeletal matrix.
• Larger elastic molecules (called polyols) that rely on the supportive structure of the chain extenders to function like muscle cells.
• A reactive glue (isocyanate) that holds everything together in three dimensions, like tendons connecting muscle to bone.

Defcon incorporates a revolutionary blend of advanced chain extenders that makes room for an extra helping of a top-grade polyol mix. Think of it as a sprinter with bones made of an advanced composite, like carbon nanotube. Since the “skeleton” is slimmer as well as stronger, more fast-twitch muscle can be packed around it, with no increase in overall volume.

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