Some of you might know that I hate riding fixed gear bikes of any kind. Solely because as a kid I was pretty much forced to ride them for 10 years. It was all I had at the time. I damned them to hell!
I got back into cycling, and I rode my road bike alot in the last 4 years. ALOT! I have had sciatica for about 12 years now. After a long time on the saddle the bike started causing me pain, aggravating my sciatica. Then it just got worse and worse. It wasnt that specific bike because I would get it on the single speed bike, and my beachcruiser too. All three of wich had different seat heights, handlebar reach, handling, and riding positions
I got to the point where even a short 1 mile ride would cause me some serious pain. I would ride regardless. When my nerve was swollen, I would notice the pain was worse when I would "LIFT" the pedal up on the upstroke. I though about this and figured that on a fixed gear bike there is no need to "lift" the pedal. The thing just turns on its own.
So, I made a fixed gear from scrap I had lying around. NO PAIN. At all. Zero. Infact I think having to resist the pedals to slow/stop has greatly aliviated my symptoms. I feel nothing anymore. I have not had symptoms in over two months. I can ride the freewheeled bikes now withou pain. I just do most of my rides on the fixed gear now. 2 out of 3 rides are done on the fixed gear.
I think a freewheel causes muscular inbalances. Thats too bad because it was great riding a freewheel all the time. I think I am doomed to ride a fixed gear. LOl That was a nice joke life played on me. oh well...