On Wednesday, I went on my first distance ride in two years, and my very first long distance ride on a fixed gear. I haven't done a ride longer than 8 miles in about 2 years. The total of this trip was about 46 miles. The first half of the ride went fine, legs warmed up, kept a steady pace of about 12-14 miles an hour. Managed to complete the first half with a mild case of saddle soreness. I took a 20 minute break, took some time to enjoy the beach I had ridden to. I noticed that an injury in my knee had started to act up. I got hit by a car while riding my bike in June, and although the knee hurts to walk on some times, on a bike it feels fine, but it aggravated for the first time (at least by bike) during the first half of this ride. On top of that, I had a weird sort of burn, knot in the muscles, but in both knees. This burn didn't hurt, it felt more like a sore or tired muscle inside the joint. Has anybody experienced this sort of burning? Might i need to adjust my saddle or cranks?