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I wonder why the crank spindle necessarily needs to be longer. Do AI bikes have longer BB shells (why?)?
– MaplePanda
Commented Jun 26 at 18:00
@MaplePanda if I understand correctly, shifting the entire drive-train to the right by 6mm would indeed require that the bb and crank spindle be 6mm wider.
– chiashurb
Commented Jun 27 at 15:49
I have also been wondering why. I am guessing it might have to do with maintaining a symmetric pedal position.
– Weiwen Ng
Commented Jun 27 at 16:42
@chiashurb Oh yeah that makes sense. In my mind I thought Cannondale just moved the rear only and left the cranks where they normally are, but I realized that would give you a horrible chain line on the smallest cogs.
– MaplePanda
Commented Jun 27 at 18:31
@MaplePanda yeah that had been my thinking too, until I read the answer above.
– chiashurb
Commented Jun 28 at 20:16

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