Bit of a bugger trying to decide which is the top ring. Finally sorted it by putting them in a vernier caliper, but there's not much in it is there?
You'd think they could stamp t and b on there wouldn't you?
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball