Thanks bikeman I came across that blog when I was looking around. It is a really good one.

The weight for the 630 I got from the manufacturer.
Which 630 and Firmstrong did you have?

But I really do find it amazing that the aluminium firmstrong would way 38lbs. Even the Chief (which has a steel frame), which the chap writes about in the article, only weighs 34.5lbs.