Ventana's stated chainstay length for El Comandante is 17.9"
I have never been sure about exactly where in the throw of the EBB that measurement was taken because even with my EBB in the furthest back (shortest) position, I was measuring 18-18.1". It is unusual for a Ventana to be out of spec in the least, so this confused me.
I think I finally have it figured out: The spec is wrong. Or I should say the spec was determined by the non-EBB Padrino and just carried over the El Comandante? I am assuming here that the chainstays from the edge of the BB shell back are identical between the SS and geared bikes. This portion of the chainstays measures 17" on my Comandante. The Padrino BB shell measures 1.8" in diameter, and 1/2 of that is 0.9", so total of 17.9" chainstay length.
When the EBB bike is fitted with its larger shell, the chainstay length effectively increases because the chainstays and the machined piece connecting the stays to the BB shell are not changed to account for the larger shell. The shell is 2.5", so the chainstays on the EBB bike are 17" + (1/2x2.5)= 18.25" This is measuring from drop-out to center of EBB shell.
It is very long no matter how you measure it.
The question I have is why?
Is it a manufacturing issue? Something to do with the machined bridge between the BB shell and tubing on the stays?
Ventana does not strike me as a company that takes shortcuts rather than producing the best bike they can in every way.
Seems to me that on a dedicated SS bike with no front derailleur to worry about you should have shorter chainstays unless there is some compelling reason to do otherwise. I think the shorter chainstays would be of benefit to the mostly standing while climbing SS rider who does not need to worry about the front end lifting in steep seated climbs.
I am no bike designer, generally love my Comandante, and would be interested in knowing the thought process behind this.
Hopefully, they will correct the spec.
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