Originally Posted by
aicabsolut
Yeah, well the anterior tibialis muscle connects to the extensor tendons at the bottom, at the ankle. These are the tendons and muscles involved in dorsiflexion (bringing toes up). So, really any overexertion in dorsiflexion (whether you think about raising your toes or pushing down with your heels) will make you sore there. It's more likely that you're going to wear things out near one attachment area (here, ankle versus up by the knee). This also indicates that there's something going on with your ankle action or toe action rather than something from the upper leg. An example with the lateral calf: Tendon pain in the peroneals is more common for cyclists down around the outer ankle, alongside the ankle bone to the attachment of one of them at the 5th metatarsal. These tendons also attach up around the fibular head, but most fibular head pain tends to be because of hamstring tendonitis, at the attachment of those tendons.
Obviously, if this persists, you should consult a physician, but I was trying to think of reasons you'd be straining that area on these road rides when you wouldn't overexert yourself on your commute or mountain bike.