I like your geometry (although your trail seems high. Road bikes are about 55-57mm. gravel may get to be 65, hybrid and mountain in the mid 70’s
It sounds like you may want a cross bike? That seems to hit your targets pretty well. 60 seems a little high for BB drop, as most road / cross bikes seem to be around 70 (gravel can get much lower, some cross bikes are higher).
I’m wondering about your disk question too. If you used one of those conversion kits to replace the QR with those bolt on adapters, would that work? It doesn’t change the size or thickness, but should ensure as solid a mount as possible with the hardware. I put an insane amount of torque through my track bike when sprinting, and those bolt on wheels seem to be solid (but that bike has NO brakes, lol).
Example conversion: http://tinyurl.com/y929qrkz
I also like the OPEN Unbeaten Path, as that seems to meet your targets, and allow a huge range in tire size (meeting your 650b requiremens)
Personally, I just run a cross bike, and I’m happy with the agility it gives me over a gravel type bike.
This is exactly the case. I don't know your height, but you can loose 150lbs safely, bicycle weight is not the issue here. If you get an good quality frame with mid-tier components you may save 5lbs over something "ultra premium", but you will break that bike right now. Get the geometry and components you want, the rest will take care of itself.
There are plenty of 30 pound fat bikes riding endurance gravel events ridden by riders faster than either of us, focus on your bicycle engine first.
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