I think I've made a tire choice error. Maybe.
The front 19mm tub I bought, while it was on the HED stretching to be ready for glue......noticed there's this little gap from the tread to side of the rim. Maybe due to low CRR sidewalls or something. It's not due to curve of the tire shape, it's like a little shelf that drops in narrower at the sidewall.
Seems this would disturb the airflow. I don't notice this on my more normal rear 23mm tire on the disc wheel, that's a Corsa Speed.
I haven't glued it on yet, so could in theory sell it used and get another front tire.