I modified my old copper singlespeed removing the carbon seatpost to replace it with a curved steel one to give clearance for the larger tyres. That meant replacing the chainstays too. Repainted in Spray.bike copper and green paint. Some time ago I had made some curvy forks. They were so curvy they didn’t really go with any frame with straight tubes but seemed to match these seats stays pretty well. Still have the option to run either fork.