Looks about 1mm thick
1mm is for rebated 10-speed cassettes on 8/9/10-speed hubs. The spacer for 8/9/10 on 11-speed hubs is 1.85mm, plus the 1mm if you're fitting a rebated 10-speed cassette.
@gbj_tester started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Looks about 1mm thick