7/8" TWISTGRIPS

Most postwar British bikes have 7/8" diameter (21 something mm) handlebars.
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DOHERTY TWISTGRIP 7/8"
HENK285
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Genuine Doherty.

DOUBLE CABLE TWISTGRIP
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7/8" diameter. Suitable for double throttle cables.

DOHERTY QUICK ACTION

HEN286
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You can use the same cable, but this grip has a bigger drum, so it opens faster.