Wheel size confusion.

pandeiro's picture

Thinking my 1980 peugeot has original rigida rims, rigida chromage superchromix,(28x1.5/8x1.1/8 700c 1982. stamped on). The tyres are 700/23, does anyone know would I be able to use 27 inch wheels, what's the difference of 700c and 27 inch?.. are my wheels 27, though they are stamped 28? Confused