Before the hand wringing starts - it's worth noting that the 303 NSW is an older Zipp wheel that his hooked and has an internal width of 19mm. It's also rim brake.
303 NSW Tubeless Rim-brake | WH-303-NTLR-A2 | ZIPP | Service (sram.com)

According to ETRTO, you can run 55mm tires on a 19mm rim.
Myths Debunked: Wide Tires DON’T Need Wide Rims – Rene Herse Cycles