On tarmac made with small chippings (like on the towpath) studded tyres sounds just like rice crispies. My favourite noise from them is on smooth hard surfaces (polished concrete being best) when I hear the metallic ring of the studs as they make contact. There's the same effect on polished setts, but usually there the ring is drowned out by the noise of my bike shaking itself to bits.
This helps distract me from remembering that all that noise is energy that I am putting in being wasted into the atmosphere rather than being used to generate forward motion.