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All Shimano centrelock rotors I've ever bought have come with a lockring. I've got at least 4 of them just sat in the drawer, never used. Even though I don't have thru axles, my cassette tool doesn't clear the QR adapters on DT Swiss hubs, so I have to use the bigger lockring. No bother as it looks much nicer than the cheap one they chuck in with the rotors, but it is a waste of metal / money to put that extra lockring in.
chiroshi-
I was having so many issues with that bike I probably got it arse about.
"SM-RT96 lockring for QR and 12mm hubs included, HB20 lockring is required for 15mm and 20mm thru-axle hubs, sold separately"
Ah, I know why I thought it didn't come with one, because the 6-bolt I bought for my new MTB wheel (that I couldn't use anyway) is obviously 6-bolt and doesn't use one!
hippy
Rotors aren't sold with lockrings are they? I thought it was the hubs that included the lockrings?
My SP was in that situation so I bought the little kit thing that had the bigger lockring included.