Its not that the rubber is wearing off too fast that worries me about the GT2k tires ...several small bulges are developing around the small cuts. Otherwise, i would say that they are great tires for the dough. I'm using Specialized Armadillos on my other rig, and these tires are great...no flats, no bulges for thousands of miles. Unfortunately they don't come in 27 x 1-1/8.