I will look these up. Icy streets are a big worry for me. No matter how careful you are your feet can go out from under you. I never used to worry about it before but approaching 69 I don't want to up my chances for a fall. I was careless last summer and crashed the bike resulting in a broken hip. Now I am ultra vigilant. If I find myself having balance issues or light hotheadedness I will move to a trike.