Actually the specs do say what the rims are, if not the hubs, nor the make and gauge of the spokes. The rims of the Alloy 6 Tiagra model (and the Alloy 7 Sora) are Maddux DRX 4000. Looks like spoke count is 32 front and rear. I assume this is correct, as I've verified the same info on the Alloy 5 105 I bought (Shimano RS10 rims and spokes, 16F/20R).