What is a reasonable temperature for slow cooked beef spareribs? I understand from a little bit of reading that too low of a temperature with beef spareribs will make for very tender muscle but fat that is not rendered (http://www.insearchofheston.com/2014/03/how-to-make-heston-blumenthals-72-hour-rib-of-beef-recipe/).

On the other hand, too high will leave the flesh falling apart and stringy (personal experience, braising for 3-4 hours).

I would think barbecue people and smoker people would have this cut of meat fairly well figured out, but in a quick search of barbecue sites I do not find anything. (well what I find is generally 95˚C to 100˚+C which I think is unreasonably high)

I have an accurate oven thermostat so I often sous-vide cook dry in the oven. Can someone suggest a temperature to try, which has worked well in your experience?
I wasn't intending to answer my own question, but there were no replies and so I went ahead with 24 hours at oven set to 80˚C (internal temperature is 74˚C which is lower than what I was expecting.

There is a little bit of water in the pan and the ribs are snugly wrapped in foil. They were rubbed in sugar, salt, smoked paprika, allspice and oregano/rosemary.