I'm doing 25 to 45 mile training rides on weekday mornings on my IRO. Saturday was 60 & Sunday was 99 miles. This Saturday will be 120 or so & Sunday about 80. I really like training, especially distance, on my fixed gear rather than my freehub bike. I have a 46 tooth chainring & vary from an 18 to a 13 tooth cog on the rear each day depending on my training schedule. Doing a century on a fixed is really a pleasure.