A JT Sprockets JTF437 (DR Big) is available in 14-15-16 but is narrower on the spline.
Could be spaced to the XR's 13mm.
I'm running one of the 16's on the DR650.
EDIT: Aaaannnnddd I was wrong. The XR one may fit the DR but the DR one won't fit the XR...
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