The titanium bicycle frame's materials are Ti3AL2.5V and Ti6AL4V?
XACD factory is mainly producing titanium bicycle frames, stem, handlebars, seat post, and so on.
All the products are made by Ti3AL2.5V, that is to say, Gr. 9, seamless tubes.
And the head tubes, dropouts are made by Ti6AL4V.
The taper head tube is made of a solid rod, then craving the inside to form a hollow tube. So the cost of a tapered tube is really higher.