Abilities Centaurs gain +2 Str and have a base move bonus of +20' (total 50'). This does not stack with class movement bonuses (such as a barbarian's Fast Movement).
Exotic Background Centaur PCs do not gain a feat at 1st level (does not include class feats/bonus feats).
Monstrous Humanoid Centaurs count as monstrous humanoids for the purposes of spell or other effects. They have Darkvision 60' and 1 point of natural armor.
Large Size Centaurs have a combat space of 10' and take -1 to their attack rolls and AC due to their size.
Undersized Weapons Although a centaur is Large, its upper torso is the same size as that of a Medium humanoid. As a result, they wield weapons as if they were one size category smaller than their actual size (Medium for most centaurs).