Thanks, They are both available in 12/28 and 11/32. So the 900i will shift better? Yes my 7 speed does have a spacer installed.
I have a M737 that my friend gave me. I just wanted my bike to be all XTR
It will shift slightly better going don the cassette. Well I noticed it between my M737 cassettes (they came in both as well)
M900 not 11/32, just 12/32
P type = 12-32
Q type = 12-28
You're looking at good money for M900 even used one's
M737 go for around £20 give or take £5
M900 can go for silly money now £60+ if new, even used seem to fetch £40+
as it the way for a number and a coating that flakes off and a lack of 11 tooth.