Quote:
Originally Posted by oneginee
The moment of inertia is proportional to the distance of the mass to the centre of rotation squared. So 18 to 19 inch can still make a 11% increase even if the tires weight the same.
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That is correct and I touched on it in my post. I still bet it is going to be close between the two stock sizes because the 19" tires look to be a pound or two lighter than the 18s. Maybe that will help offset some of what the rim difference is because the tires are even further from the center.
