I've been doing the Bike Austin Sunday morning rides that start from the Peddler in Hyde Park. It's a good group of experienced intermediate riders. Rides are anywhere from 40-50 miles with a 14/15 mph pace. All of the rides are no drop and have a ride leader and a sweep. Rides start early enough that traffic is seldom an issue and we're usually drinking coffee at Flight Path by 11. Rides and routes are posted here https://rides.bikeaustin.org/Our-Rides/.