Can anyone that uses these quite often tell me what I can expect for a circumference? I know tire sizes jump around a lot, but just trying to get an idea if they are mostly 103", 106" etc... Thanks.

Almost all of ours roll out around 103 to 103 3/4'. Hope that helps

In my experience I usually get new ones to roll out at 103.5 to 104.5 then after they go through a heat cycle the y usually loose a half to a full inch.