The XT600E changed in 1990 to a 17" chrome rear rim. The 1989 model had an 18" aluminum rear rim, and I think the hub was the same (i.e. disc brake, fixing, etc...). It may be worth checking some of the parts lists to double check?
Fyi, I have an '88 3AJ Tenere which has an 18" ali rim with a disc brake, so it is worth checking this period.
Footnote: Checkout the 1987-1989 2KF model - 18" rim & rear disc brake.
...............Stammbaum XT600 2KF
Last edited by GeoffE; 26 Feb 2012 at 23:35.
Reason: XT600 2KF model....