Two inches around or long/ Also, what is the sectional density. You see, the more dense and finely packed (as Saylean mentioned) the longer the digestive tract and therefore the bigger bear. Also..was the pile off to the side of the road, right in the middle, or hidden discretely in the brush. I find that the bigger older bears really have no shame and will drop a duece in the middle of a shopping mall if the mood suits them. The younger and more timid bears usually are not as stoutly build and therefore a bit less confident and will poo much more discreetly.
What I meant was that from my experience seeing plenty of poo and hundreds and hundreds of bear pics on my cam the bigger the diameter and the bigger the pile the bigger the bear. Simple as that. Keep after it and I hope you connect.