I haven't been able to find UPF bike tights, but I did find a great UPF 50 longsleeve jersey! I wore it Saturday for a 2 hour ride and Sunday for a 4 hour ride, with no sunscreen underneath - I did not tan in the slightest - yay! You can find it on www.boure.com. Oh, and it was close to 80 degrees on Saturday and I felt very comfortable. $70 - no tax if you are outside of Colorado - and free shipping. Awesome.

Let me know if you find any UPF tights. I wore my chamois cycle shorts underneath my UnderArmour tights and didn't see a tan line from the shorts, but I really don't think that even black cycle tights have a very high UPF rating (they let in some sun).

Other helpful stuff: Full-finger gloves and zinc oxide (Z-Cote) sunscreen on face and lips (Z-Cote blends in and doesn't look white; it's waterproof and is the blocks the most full-spectrum rays of all sunscreen ingredients).