A rimmed flywheel has a rim, a hub, and spokes.[9] Calculation of the flywheel's moment of inertia can be more easily analysed by applying various simplifications. One method is to assume the spokes, shaft and hub have zero moments of inertia, and the flywheel's moment of inertia is from the rim alone. Another is to lump moments of inertia of spokes, hub and shaft may be estimated as a percentage of the flywheel's moment of inertia, with the majority from the rim, so that {displaystyle I_{mathrm {rim} }=KI_{mathrm {flywheel} }}I_{mathrm {rim} }=KI_{mathrm {flywheel} }. For example, if the moments of inertia of hub, spokes and shaft are deemed negligible, and the rim's thickness is very small compared to its mean radius ({displaystyle R}R), the radius of rotation of the rim is equal to its mean radius and thus {textstyle I_{mathrm {rim} }=M_{mathrm {rim} }R^{2}}{textstyle I_{mathrm {rim} }=M_{mathrm {rim} }R^{2}}.[citation needed]

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