Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 9 Post(s)
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Axle length is only half the story. The other half is the offset built into the cranks that determine where the chainrings and pedal are with respect to the end of the spindle.
Iver the years, spindles have gotten shorter and crank offset bigger by the same amount, so a modern 103mm spindle and crank, can give you the identical chainline as an older 120 spindle and crank.
20:1 odds are that the new crank and BB will work on your bike without problems, since the offset between the right face of the BB shell and chainstay where the chainrings clear has remained virtually unchanged for 40+ years.
BTW- I'm disappointed to hear that the shop staff told you otherwise. If your frame is unusual they might be right, but I suspect that they're simply unknowledgeable. (ignorant is too strong, though it may be true).
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance