Regular massage therapy. Some of it you can do yourself after a ride on the anterior and lateral calf. To get at the stuff higher up that may be contributing, you can use the Stick or foam rollers or do self massage, but I find (in my experience) that my hips and glutes are often a big contributor (makes my pelvic symmetry off), for which I need someone else's hands working. In fact, massage and ultrasound performed by my PT helped the most in fixing my peroneal tendonitis. She said the muscles were plenty strong. Then we focused on fixing my pelvic alignment and fixing muscle imbalances up there. I know when my calf starts flaring up that I've usually been having more hip and ITB issues that I need to address, but I can keep the calf from getting really bad by digging in with some menthol-y muscle rubs.