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TRIUMPH PLATES - Browse Original Triumph Catalogue Plates
Original 9" Alfin type drum with "grooves running around the circumference". This drum is as near as is practical to the original Welworthy design and has fins running around the rim. Cost is for a single drum.
As these drums are much more expensive than the alternative design, you may prefer the alternative design with transverse fins (RTR4108 see below) as performance in service is similar.