Canyon Grail geometry

I'm getting a custom ti frame based on Canyon's Grail (aluminum--the CF grail has different dimensions because of the two-tier handlebar). These are the published head tube lengths:

2XS: 117mm
XS: 133mm
S: 124mm
M: 143mm
L: 169mm

As you can see, the XS head tube is way out of proportion to the other sizes. The builder says it would be almost impossible to maintain that head tube and stack (533mm) in the same bike. Anybody have a clue as to what might be going on, or anyone have an XS Grail AL to measure? I figure asking Canyon directly would be poor form, given what I'm trying to accomplish...

(Psst...You posted this in the classifieds section)

Yeah, I realized that after I posted it--I'm new to the game--but I can't figure out how to move it or delete it, and double posting also seems kind of lame:-(

NormH wrote:I'm getting a custom ti frame based on Canyon's Grail (aluminum--the CF grail has different dimensions because of the two-tier handlebar). These are the published head tube lengths:

2XS: 117mm
XS: 133mm
S: 124mm
M: 143mm
L: 169mm

As you can see, the XS head tube is way out of proportion to the other sizes. The builder says it would be almost impossible to maintain that head tube and stack (533mm) in the same bike. Anybody have a clue as to what might be going on, or anyone have an XS Grail AL to measure? I figure asking Canyon directly would be poor form, given what I'm trying to accomplish...

Really high BB??

More likely, it’s a misprint. 

Mudge wrote:More likely, it’s a misprint. 

Yep, I think you could intuitively guess that it is going to be somewhere around 120. I would think you builder could work out a number that works with this build. 

Or... 
Maybe we are all wrong...
Maybe Canyon listed it correctly...
      and...
Maybe the XS uses 650b wheels.

😲😜😂

chas wrote:Or... 
Maybe we are all wrong...
Maybe Canyon listed it correctly...
      and...
Maybe the XS uses 650b wheels.

😲😜😂

Well yes, of course (and obviously the XXS does as well), that's why the chainstay is 415 and the wheelbase is 990. But how does that affect the head tube and this particular conversation?

I figured it was a misprint or that the XS and S numbers have been swapped, but there have been so many reviews of the bike with so many reposts of the geometry that I can't believe it hasn't been caught by now...

Mudge wrote:More likely, it’s a misprint. 

Yeah, that builder says to go with 120, but I have been just trying to eliminate this lingering doubt. Anyway, I appreciate the response, thanks!

Konass wrote:

Yep, I think you could intuitively guess that it is going to be somewhere around 120. I would think you builder could work out a number that works with this build. 

Bottom bracket offset is consistent, XXS-XS 60, all other sizes 75.

Mudge wrote:


Really high BB??

Norm, if you reduce the diameter of the front wheel from 622mm to 584mm (effectively reducing "I" a lot), don't you think the actual measurement of the head tube (D) might be longer???  to take up some of that change?

chas wrote:Norm, if you reduce the diameter of the front wheel from 622mm to 584mm (effectively reducing "I" a lot), don't you think the actual measurement of the head tube (D) might be longer???  to take up some of that change?

I see it now--many thanks!