It's 38x9.75, with a little W in back and a full tail. Fun deck. The griptonics are the new best freeride wheels on the planet. Same factory as smokers, the older road rage, and orangatang, but thes urethane is different and designed for this. The core is a wider core for skateboarding not rollerblading. 78a, 81,84,87a - got them Friday, and they are selling by the case, it's great.