Should a fixie have 700c wheels or 26 inch

also your Hurules is not the same 26" as mtb 26". Your Hurcules is probably 597 mm ISO where as mtb 559 mm ISO. Remember if you have 700c wheel no one says you have to put 23 mm tyres on there. If you want more bounce put some 28 mm or even 32 mm tyres on.

Its not the hercules, that is being left as it is. That is my practice for a single speed. Even though the frame is a little small for me.