From the photos they look like a front and a back 26/27 wheel to me, but the rim looks to be for a 28 wheel. Is the felloe (the steel spoke retaining band the rim is mounted on) the same width as the base of the rim? If so they are 1928 wheels: if the felloe is 1/2 inch narrower than the rim they are 1926/1927 wheels, and the rim is for a 1928 wheel.
Normally a 1928 front wheel will have a brake drum mounted on the inside of the wheel hub, which is held in place by the hub nuts, but the 26/27 front wheels do not have front wheel brakes, so there is only a narrow steel clamping ring for the hub nuts to bear on. As a further check the width of the felloe where the rim mounts should be about 2 1/4 inches for the 26/27 wheels, but this can vary a bit with the condition of the wheel. The 1928 felloe will be about 1/2 inch wider.
Frank.
Last edited by franco; 01/25/18 09:04 PM. Reason: Additional information