Whats the difference?

Geometry and materials? Think 905 is slightly slacker geometry

I think most of the difference in geometry is accounted for by the adjustable dropouts on the 19. Download the Whyte brochure as it has the accurate figures, the website itself is prone to throwing up all sorts of strange specs and sizing info. The other day it was suggesting that the 19's came with DT forks for the Ti and SIDS for the ally one. It also throws up incorrect sizing from time to time. The 905 is only 1/2 pound heavier than the 19 which may well be down to the kit rather than the frame.

The 19 is the don.

If your thinking of going 'core then get the 905 for 'core trail use. 😛

If your thinking along the lines of adjustable geometry to suit both xc and trail riding plus also having the bonus of ss'ness then definately get the 19.

Expect the 905 to weigh a tad more than the 19 though but I doubt by that much.

whyter