Gravel Skate Gear

Skateboarding – For Skaters by Skaters

Large Skateboard Wheels

September 26th, 2007

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Large Skateboard Wheels

Skateboard Wheel Physics?

i have a few questions about how the size of a skate board wheel affects the speed of the skateboard.

what are the advantages of a large wheel?
what are the advantages of a small wheel?
how is friction realated to skateboard wheels?
how does the size affect the amount of friction in a skateboard wheel?
Why do large wheels absorb more of the bumps on a rough surface?
and if you have any sources of were u got them

thank you!!

larger wheels mean more momentum, so you can keep going longer between pushes.
smaller wheels mean less force is required to accelerate the skateboard, and so would be better for tricks or other quick changes in velocity.
friction is proportional to the force on the bearings and the total area of the bearing interface. in reality, it is also affected by velocity (ideally, as long as the velocity is nonzero the friction is constant)
the frictional torque placed on the wheels will be the same, as long as the bearings are the same size. for a larger wheel, however, the linear momentum of the rider and board will have a much higher torque on the wheels than for smaller ones. so friction will have less of an impact on linear momentum for larger wheels.
large wheels absorb more bumps on a rough surface because the wheels have a smaller curvature (the edge is straighter). this prevents the wheels from falling very deep into cracks, and instead just riding on top of the bumps. (imagine a marble rolling on top of a keyboard, then a tennis ball. the marble almost can fall between the keys, but the tennis ball barely notices them as it rolls)

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