My present problem is weaving.tripping, heavy + legs or floppy legs. These happening at different times depending it seems on degree of exertion or usage. No upper body symptoms as yet. Why can I ride mountain bicycle with feet in cleats and feel completely balanced? No sweving. I do have adverse symptons after a ride but the pleasure of the ride is worth it. I use a cane when walking the dogs. I do not have SCA but Sporadic Ataxia.