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Yo
With 700c x 40c you should be able to fit a compact chainset on a 68mm bb without any dimpling at that chain stay length. Look at the Surly Cross Check eg.
Something about your chainstay modeling doesn't look right. I think maybe you got the taper wrong??
Columbus Zona S Bend Cx should be dimpled I think. They are already squashed from the factory.
I can take a photo of my most recent frame if you want.
Hulsroy-
Look at the Surly Cross Check eg.
That's pretty significant dimpling?
I'd be interested in seeing a picture of yours, I believe it's at the same bend I'm using. The cx bend. Does anything about this look off?
And regarding the taper, I've modeled them as with the centers of both the ovals and the circle on the centreline of the stay, where it would be more accurately modeled with the centres of the ovals slight below (or the centre of the circle slightly above) the centreline.
Upper being how I modelled it and lower being a more accurate version of it, I think it affects some of the mitres so I'll try to rectify this.
Tijmen
The tubing selection really seems to be final now:
ZON113550001
SLFL11560
SLFL12650
2*SLF114OV410001133CR
2*SLF715560133E
Bike (geo still completely up in the air).
With these chainstays clearance to rings is completely fine, with some dimpling on the inside it should fit a 700x40. (Are these the ones you are using, @Hulsroy ?)