Join Date: Aug 2006
Location: Alexandria, VA
Bikes: Firefly custom Road, Ira Ryan custom road bike, Ira Ryan custom fixed gear
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I've ridden three sets so far, and the 4th just arrived. I ride them until they have a clear flat channel, not to the wear indicators. I get about 1,500 -- 2,000 miles a pair, with a rotation front-to-back at the midway point. I'm 205, and very hard on tires. Never flatted a GP4000s, and only twice on about a dozen sets of 28mm gatorskins.
If I were you I would VERY carefully check my rims for any burrs, nicks, peeling rim tape, or anything along those lines. IMHO, your experience is not due solely to the tires. BTW, 120 psi is above the maximum, IIRC. that may be part of it. I go 105 front and 110 rear. Max is 115, and if your pump is a little off (say 5psi), you may be pushing it.