Thanks for the reply. I'll try the Tums. Interesting that it will work at onset. I do get little warnings that the cramp is coming soon. I do have flexibility of the foot bones that I believe have assisted in a more normal movement and with a shoe on it looks as if my ankle is moving. There is a noticeable difference between the two lower legs in calve size. The first year after the fusing I would sometimes get twinges and pulling deep inside my lower leg when in bed, especially after a very hard ride or race.

I don't think it's bike fit unless my road, track, fixie and cross bikes are all set up wrong. I don't recall having the issue on the mtb, however most rides are not long sustained and HC efforts. I have had professional fittings on the road and track bikes.