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Disc wheel
From WikiPedalia
A disc wheel is a wheel with solid sides, instead of spokes. Although disc wheels are heavier than spoked wheels, they have less air resistance, and permit a cyclist to go noticeably faster. They are not usually used at the front, because they can cause severe handling problems in crosswinds. They are not usually used for hilly conditions, because the added weight is too much of a disadvantage on the climbs.
The illustration is from Archibald Sharp's Bicycles and Tricycles, originally published in 1896, republished by the M.I.T. Press in 1977.
The front wheel has cutouts to reduce steering problems that result from crosswinds when disc wheels are used on the front.
