The Bones STF V4 Retro 54mm 103a Skateboard Wheels are made with a substantially higher rebound urethane that is super flat spot resistant for more speed and awesome slide characteristics.
Urethane - STF 99a (Easy Streets Formula) BONES WHEELS Easy Streets are softer 99A Street Tech Formula wheels that ride smoother and faster on a greater range of terrain, without loosing the unique grip, slide-ability and characteristic bark of our original BONES 103A / 83B STF. Easy Streets will improve your skating if you are not always riding super smooth concrete. They make it more fun to skate a wider range of terrains by cushioning your landings, gripping, sliding, and rolling easier on rough pavement…without flat spotting.
Shape Wides - (aka V4 shape) Wide wheels are designed as a fuller shape made with more urethane. It’s a wider wheel that can give you more slide control and more durability. It’s a more stable shape for big gaps and aerial landings.
Wheel Size - The 54mm size is a great all-around street and park size to hold speed in the flats and give you good momentum in small transition, while still offering a very quick and predictable pop to really dial in your flip tricks. A great size for average to full-sized humans to flip and grind all the street and park features.
The bearing core is center-set so you can reverse the wheel to save the graphic or to maintain a longer life by rotating your wheel placement over the life of the wheel. This is handy when you slide your wheel often particularly in urban terrain that can wear your wheels in an uneven way.