Tendon pain from distance unicycling with the guni

[siafirede]

I have never had any pain on my tendons near my feet while riding long distances on unicycles, but I went for a ride on some hilly terrain with my relatively new geared 29 yesterday and kept it in high gear for most of the ride. After the 33 mile ride with a lot of ascents and descents the top of my foot where it meets the leg was killing me. It is in line with the ankle but on the front, so I am assuming I strained some kind of anterior tendon in my leg (it isnt in the back where the achilles would be, it is in the front).

I am curious as to why this pain occured and if anyone has had similar issues and how you fixed it.

My thoughts are...

1) It could be from a seat height issue (but I don't think this is the case).
2) It could be from riding in high gear constantly with 125mm cranks and the force was just too much for me on the climbs and descents.

Any input or ideas?