I am building my first fork, and since I don’t have a crown race seat cutter, I am planning on finishing the crown race seat by turning the fork on a lathe at work. Can anyone help me with the final diameter specs for both 1" and 1-1/8" steerers?
From reading Fork Crown Race Cutting and Facing | Park Tool it looks like it’s 26.5mm for 1" and 30.1mm for 1-1/8" – is that correct?
This is from a headset/steerer guide that Cane Creek used to have available on their website. Someday I’ll scan the entire document and post it.
Thank you Mark! That’s perfect!
How are folks taking these to the correct dimension without access to a lathe?
I am aware of park tool CRC-1 (not a cheap investment). I’ve had two people tell me when they use them they always end up undersized.
Any success stories out there with the CRC-1 tool, maybe a method for getting them to cut accurately.
I used the Park tool when I built my frame at UBI and it seemed to work fine.
+1 to the CRC-1. I use it frequently for 26.4mm, 30mm, and 40mm race seats with no problems. I’ll sometimes use the lathe to get it close and just get the final 0.1-0.2mm with the Park cutter.
I finally found this document. Originally from Cane Creek’s website, but I haven’t seen it there for a few years. It’s not the latest(no 37/37 EC), but still a lot of valuable info. Please pardon my notes.
CaneCreek_HTGuide.pdf (2.9 MB)
I have the Park tool and haven’t had any issues. I usually use my lathe though.