Well, to be totally truthful it's just easier to get a 1.5" downtube onto a 1.5" BB shell with room to lay a nice fillet and ditto with the HT.
No upcharge for big bikes, if I did that I'd have to issue refunds for all the ends I cut off the tubes for the small bikes :)
Good questions, many "features" on frames are really just there to make the F'builder's life easier!
- Garro.
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