Hello,
I saw on page (Bikes | Zwift Wiki | Fandom) that for example frame Zwift Carbon has a couple color options.
On screen below there is Zwift Cargon frame in black color
I have windows client and I don’t know how to switch those colors.
Please help 
In your “garage” click on the frame and a small spray paint can icon should appear on the right side of the window where your avatar is pictured on the bike. Click on the spray paint and a slider bar should appear to change the color.
Yes, thanks. I saw that spray paint in garage, but when I move it, it just changes the color of orange accents of the white frame. It doesn’t change the whole color to black.
I don’t think you can change the frame color to black on that bike. I believe it is always white.
Ohhh, that’s too bad. Thanks for the quick answer!