True VegasZ. Weight distribution is also a factor. If you have wheels that weight the same. If the design has a large mass centrally located by the hub with thin spokes going out the the rim, it will be require less energy to accelerate. If you have a rim that is has a thinner hub but has a more solid spoke design the weight is moved further out from the axis giving the outside mass more leverage to resist movement.
For those that need a visual. Take peice of rope and tie a weight close to your hand now spin it so the end of the rope is making an arc. Now grab the other end of the rope and spin it so all things being the same. The end of the rope is going to the travel the same distance but with weight further from the axis. Tell me which os more difficult. To start and stop.
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