Cp chrome plated, Kt and gucp mean nothing to me. 26 x 2.125 is a tire and wheel size. 559x28 is the same tire in metric numbers. These would both be what was known a balloon tire or Mountain bike tire sizes. Stl Cp 36 Kt Cb 110mm 12gucp. probably relates to wheels. Stl steel Cp chrome plated 36 number of spokes Cb coaster brake 12g 12 guage spokes ucp??? I suggest you just start readin these forums and it will start making some sense to you. Roger