My new 11 speed sram cassette PG-1130 will not fit on my dt swiss 370 hub. It's a shimano style freehub body. I did not install a spacer behind the largest ring. :
Bike Freehub & Cassette Compatibility Manual
Problem Solvers Cassette Spacer - BIKE24
cassette-spacer-shimano-pattern-11-speed-2.18mm
Single Speed Cassette Hub Spacer Kit Shimano for SRAM (10/11) Spline Road 17T | eBay
Zipp Cassette Spacer for 188 Rear Hubs (Shimano 11 Speed to 10 Speed), 11.1918.008.000 : Amazon.co.uk: Sports & Outdoors