I just recently installed my shinko sr428s which is also like the 203/204s. It was a bout 65 degrees outside when we installed them. I didn't have any tire spoons so i toke some cheap box wrenches and ground them into a homemade tire spoon. Then with my dads help we used some dawn soap and water and worked them onto the rims. Just be extra cautious of the tubes. Rear tire was the hardest but we used little movements.