I need help with color combinations!

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Well red yellow and blue are the three primary colors. Thus, yellow & blue cannot be any more 'right' than blue & red or red & yellow.
You might be thinking of 'complimentary colors', but for that you need 6 colors: yellow, orange, red, violet, blue, and green....laid out in a color circle. Then you pick the colors directly opposite each other (which you can't do with a simple 3 color primary triangle), such as blue and orange, or green and red...and those are complimentary. The complimentary color to yellow would be violet.

Interesting. When we do light in physics, I sometimes compare (contrast?) the three primary light colors (red,green and blue) to the primary colors of paint that they learned in school because they are different. I didn't know about the complimentary colors and the circle that you mentioned, or maybe I forgot? I know you have mentioned being a graphic artist, so I'll use this info and make even MORE comparisons to the colors of light and credit you as "I once bought a saddle from a graphic artist and she said..." . More experimentation, more hands on means more learning. Thanks.

I also like the red idea because of the lettering. I like things to match to a point, and I think that would pull the whole bike together. Be careful of too much red though, (tires,bottlecage,saddle,bartape all at once) because the reds probably won't match or it will look like you tried too hard. Not that YOU tried too hard to please her, but when she takes it out. Although maybe that's just me...