Straus Guide 1980 from Thornton, CO on 4/12/2025 2:12:06 PM:
I highly recommend Big Wheel Bikes in Arlington. As Rivnuts said, it's accessible by bike trail just a few miles from the C&O. I rented a bike there for a through ride last summer. They know how to take care of riders and also have plenty of supplies on hand. They don't do a lot of advertising and keep their rates down.