was compact crank report, now Campy vs. FSA chainline

[jim c]

Well now, this discussion of chainlines and dropping the chain has
certainly put a wrinkle in my perfect plan,... or has it?

Comparing FSA K-Force Mega Exo *non compact 53-39* road crank with a
Chorus, both specs claim "chainline = 43.5mm" is this apples/apples?
does anyone (ok...does Peter) know if both cranksets place the big ring
in the same place, (43.5mm inside face to center BB) ?

different subject, I know, the FSA claims the Q-factor is 147, and I am
guessing that this outside crankarm-oustide crankarm, not sure what the
Chorus is...maybe 120? but this is more for pedal or tread width than
chain line, right?

any clarification is appreciated.

jim

 

[Paul Kopit]

On Sun, 02 Jan 2005 13:50:28 GMT, jim c <[email protected]> wrote:

>Well now, this discussion of chainlines and dropping the chain has
>certainly put a wrinkle in my perfect plan,... or has it?
>
>Comparing FSA K-Force Mega Exo *non compact 53-39* road crank with a
>Chorus, both specs claim "chainline = 43.5mm" is this apples/apples?
>does anyone (ok...does Peter) know if both cranksets place the big ring
>in the same place, (43.5mm inside face to center BB) ?

Sheldon Brown has the method of measurement with pictures in the
chainline section of this page
<http://www.sheldonbrown.com/bbsize.html>

Both the Campy and FSA doubles carry the rings the same difference
from the centerline of the frame. I recall that 43.5 mm from the
center of the frame to the space between the 2 chainrings is the
measurement.