These are the official colors of a Rivendell World Champion. How do you become a Rivendell World Champ? Buy the sticker, and you're in.
They're based off the old, now discontinued, Irish Strap colors.
112 x 17mm with a RBW diamond to cover up the seam. They're a little tricky to put on, but you'll do at least as well as I (Will) did in the photos. True Riv world champs won't mind a bit of imperfection.
For 28.6mm tubes, I find it's best to cut between the N and D in "Rivendell" for a perfect wrap. Ignore the A and B cut lines; something was lost in translation. A 28.6mm tube is 28.8mm with paint, and 28.8 x π is 90.5mm.
If you want to get the sticker totally straight, make a template with the top of the sticker sheet. Tape it on with a square of scotch tape, wrap it so it perfectly overlaps, and then use it as a guide for the stripe sticker.