I am another in favor of the Hutchinson Overides. I am using the 35mm tubed on a Jamis Renegade Expat. Can average 18-19 mph on road rides (20-40 mile rides). 16-17 on mixed rides (same distances) (all on Strava). The gravel is a mix of hardpack to some loose in sections and most paved roads suck around here. Able to keep up with our cycling group on longer rides around 18mph with no issues. I've only had one flat in the back when going over a railroad track, a piece of metal went through. Otherwise no issues. After 1200 miles still looking new. Plan on running tubeless here soon. I would assume the 38mm version would be very close if not just as fast as the 35mm. Hope this info helps!