I always measure my circumference by rolling out the bike when I put on new tires. It seems that the measurements I come up with are always significantly different from what the pre-set value for that size tire would be, or the values that most websites quote. I'd like to know what people come up with when they roll out their tires. For 700 x 25 I usually come up with something around 2131-2133; for 700 X23 I come out with something in the 2117-2119 range.

Is that consistent with what others get, or am I way off?

Bruce