Originally Posted by
squirtdad
gp4000 25 is known to be be closer to 28 actual in many cases fwiw
Thanks for this info. Indeed, the GP4000 looks really beefy. I swapped with a 25C Gaterskin and now there is plenty of clearance under the crown. I'm going with this for now while watching for a white label Ouzuo Pro in pristine condition. I'm not adverse to changing forks but the current fork rides well and the frame geometry is designed (in part) around the fork.
BTW, I measured length of a blue label Ouzo Pro like the current one on the bike and the original version with green/yellow label and the old version is heavier and longer. There isn't a ton more clearance under the crown though. Guess it just goes to show that details matter and don't take anything for granted when building a frame.