Hurricane wind speed vs. pressure?

I'd like an explanation of intricacies of what exactly governs wind speed in a hurricane. I don't think central pressure is the only factor. For instance for a central pressure of 920 mb I've observed it's possible to have both 145 mph and 170 mph wind speed for two different storms. My rudimentary understanding of wind leads me to speculate that different pressure gradients are somehow responsible. Does it perhaps have something to do with the diameter and forward speeds of the storm as well? If a higher-pressure storm were moving at a sufficient clip would it stand to reason it might produce more wind then a lower pressure storm. Is any of this speculation close, what's really going on here?