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Reach and Stack, then work out RAD with pythogoras.
https://www.google.com/search?client=firefox-b-d&q=pythagoras+theorem
You will have to account for planned stem/bar/spacer dimensions. But you will get a good idea of what is in the ballpark.
Lee has a fit calculator online that will do it for you. Just enter geo numbers, stem info, bar info, headset spacers, etc.
Used to be a free 30 day trial, otherwise worth the $20 to get a dialed setup right away when bike shopping.
https://www.llbmtb.com/members/
Handlebar set back is the killer though, they are all over the place and you really need to measure it to be accurate. For comparative purposes, OneUp 35mm rise bar cut to 750mm has a 40mm setback. WeAreOne 35mm rise bar cut to 750 has a 32mm setback. Up sweep and back sweep angles are the same for both bars at 5 degrees and 8 degrees.
This calculator is free and will give you RAD and RAAD: https://madscientistmtb.com/bike-geometry-compare/
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