Originally Posted by
eric044
I will try to pre-stretch again. If it doesn't work maybe it will work with glue on. The rim is an Araya 16B Red.
With glue on it will be 10x harder. That's why the pre stretch.
No air, for sure! I've never even heard of this idea. I've installed many hundreds possibly thousands of sewups and have never put any air in them before at all. Completely empty with the valve unscrewed is what you want.