I use 27" tires, too, and although I have not used Panaracer, yet (the supply for my beloved IRC's seems to be drying up), I do appreciate the fact that they weigh from 100g to 200g less than some vintage 27" tires. The Panaracer Pasela is universally liked, here at B.F. Review any thread on them. I would not hesitate to use them. Do yourself a favor and get a presta 27"x 1 1/8" (700c x 28) tube. What type of surfaces do you ride on, what is your weight and do you plan on carrying heavy items (touring, grocery shopping, etc)?