Clunking noise on R1, wheel bearing?

[Billing]

Coming home tonight noticed that up until about 45mph there's a strange clacking noise coming from underneath my R1, sometimes it makes a clunk through the pegs, sometimes not.

With the help of a mate I gave both wheels a good tug at 12 & 6, 3 & 9 to see if I could feel a knock in the bearings but couldn't.

Could it be the sprocket carrier bearing? The bike doesn't lurch around or anything, it happens in every gear and it only happens when I'm on throttle, even a little bit, and goes away when I completely shut it off.
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'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
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[Casper]

[CaNsA]

What the green one said.

My zxr had the same thing, needed a new chain anyways.

Fitted, problem solved.