Having seen loads of guys bikes who race streetstocks, the current rules seem to require a brakelight only. Without one, you'll get rear-ended by a dozey one eyed cell phone using twonk in a cage.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball