Been fighting the snow to get to work and back today. My tyre combo is front Schwalbe ice spiker with middle studs removed as it likes to skate on wet concrete when braking, rear is a kenda tyre that came with my bike, studs screwed into the inner side knobs, then an old tyre tread inside to protect the tube as the studs poked through a little. I found traction is actually better on the ice as it doesn't move, the snow drifts all over the place so I really have to concentrate, but satisfied I can safely negotiate it all with a bit of care.