Print Matt Leeper, vice president of sales, (left) and Darren Thomas, senior vice president and chief operating officer, speak during a Sumitomo Rubber North America (SRNA) Inc. virtual presentation on Feb. 2, 2021. RANCHO CUCAMONGA, Calif.—The ripple of 2020's global production shutdowns and unpredictable markets looks more like a tsunami in 2021, and it is stretching the Asia-to-U.S. supply chain to its limits as demand soars, Sumitomo Rubber North America Inc. officials said recently. Shipping containers are in short supply and so is space on ships. Companies lucky enough to get on a vessel—likely paying premiums of at least 200 percent—still have to wait out an extended process at U.S. ports, where COVID-19 restrictions and off-load demand have created a bottleneck.