Bushings are the urethane, rubber, or silicone rings that sit around the kingpin and control how the truck turns. Hardness is measured on the A-scale (durometer): lower numbers compress more easily and allow more lean and turn; higher numbers resist compression and increase stability. Teak Tuning's documented Pro Duro Bubble Bushing range uses a proprietary silicone blend in 51A (extra loose / maximum truck movement), 61A (loose / very responsive), and 71A (medium / crisper movement with moderate range). FlatFace offers Blistered-branded bushings described as having high rebound and responsiveness, as well as Mike Schneider Pro Bushings with a distinct material and two top bushing hardness options.
- Lower durometer (softer) = more lean and turn, looser feel.
- Higher durometer (harder) = less lean, more stability and return.
- Teak Tuning documents 51A, 61A, and 71A as their three released durometer tiers.
- FlatFace carries Blistered bushings and Mike Schneider Pro Bushings as upgrade options.
- Blackriver documents replacement-bushing hardness by named tier and color rather than a published numeric durometer.
- Dynamic sells spare bushings with pivot cups, documented as medium hardness with no published numeric durometer.
- Worn or flattened bushings can make a truck feel looser than its rated durometer suggests; inspect before attributing handling changes to bushing hardness alone.
- Most fingerboard trucks use a pair of bushings (top and bottom); some advanced tuning uses different hardnesses for top and bottom.




