Same thing here. I'm an ultra-cyclist -- my pain starts after about 150-200 miles... It got really bad towards the end of a 400K and I had to quit, but I'm back to back-to-back centuries and I just did a 216-mile ride, with minimal pain - I iced like crazy the day after.

What is your PT doing?

I'm doing IT band stuff with the foam roller, but I think the most important thing was an analysis of my pedal stroke. He discovered that I tended to swing out my knee slightly at the top of my stroke, and probably was really bad as I got further into the long-distance rides. So, I'm working on keeping my knees close to the top tube.

Any tips and exercises that you're doing that seem to help?