"B&B" stands for "Borg and Beck", which was a company that made clutches
(among other things). They no longer exist as a separate company, only as a
name (that like "Lucas" has been sold and re-sold). But "back when" they
made lots of different clutches, for different makes, models and years of
cars.
So with regards to Triumph TRs, we have at least the "3-finger" B&B clutch
used on TR2-4, plus the "diaphragm" B&B clutch used on (at least) some
TR4A-TR6. Then there are actually several different B&B clutches that fit
the TR4A-TR6, as documented in the articles by Brent Kiser & Nelson Riedel.
(I don't know offhand what the TR7 & TR8 used.)
> What is or how should one call the 3 lever arm PP that
> was used in early TR4's & maybe earlier TRIUMPH models? I
> thought the 3 lever
> arm PP's were B&B Clutches.
When it is important to distinguish, I suggest "3-finger" for the B&B TR2-4
clutch, and "B&B diaphragm" for the B&B version of the TR4A-TR6 clutch.
-- Randall
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