In these photos I have tried to show the widths and diameters comparison of three different wheel sizes. On the left a 29er x2.1, then the 29er Plus 3" and finally the 26" x4" Fat bike tyre. As you can see the outer diameter of the 29er and the 26" Fat bike are pretty similar and the 29er Plus is far bigger. The 29er Plus is about twice as wide as the 29er, I put this down mainly to the wider rim width on the 29er plus (49mm)
I have shared some information on how I developed the first prototype 29er Rudy titanium frames, this first blog is concentrates on inflated tyres widths on Stans Crest rims at either 35psi for MTB or 75psi for CX tyres.
More tyres measurments will follow as I get them but currently up on the site is the Specialized Renegade 29x1.5 and Nobby Nic 29x2.25 along with the Ritchy Comp CX tyres 700c x 38mm. http://traversbikes.wordpress.com/2013/09/13/tyre-widths/
HAND BUILT TITANIUM FRAMES.