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Message: [QUOTE="trevor.summerfield, post: 1174883, member: 72880"] Hey I took this right off the yamaha site, its a flywheel with extra weight right into the flywheel. I saw this at the bottom and wanted to know something. """""*NOTE: Flywheels are measured by inertia weights because the affect of the weight differs depending on where it is in relation to the center of the crank. So a 4 oz. and 6 oz. weight might have the same affect depending on where they are positioned in relation to the center of the crank.""" """""Adds 1.5 oz. for an inertia mass of 4.5 kg-cm² (stock inertia mass=4.0 kg-cm²) """" So the question is, would anybody know what the inertia mass of lets say a 9 oz flywheel weight be? because it might be more or less than one would think because of the placement. So actually wouldnt this make a 9oz weight from one company be different than a 9oz weight from another, because they might place more of that 9oz's away from the center. and another way to look at this might be holding a 9oz weight on a short string and spinning around in circles, and comparing that to spinning the same speed with the 9oz weight on a very long string, the affect would be very different. So with that in mind wouldnt a 9oz weight with the weight centered around close to the crank be the same as a 4oz weight centered further away? What do you guys think about this? Trevor [/QUOTE]