Used the python trike till last monday, but the problem is, that my ass and the knees start freezing. The rest of the body is fine. A nice fact is, that I can drive with a thermo mug full of hot tea in one hand. The disc brakes are also a bit noisy but I think, that's not caused by the temperatures but instead by to less maintainance. I've built a fender over the front wheel, so the mud is no problem anymore. About the tires: I also had some schwalbe spikes for my race bike some years ago, and drove it throught the snowy winter without problems. So Uipkos tip sounds good to me. Cheers, Steffen