As far as I know, there never has been a supplier of aluminum Vincent brake drums. Several members have made small numbers for themselves or their friends, but nothing that is for retail, as far as I know.
The Series A Rapides had alloy drums with iron liners as an option to the terrible spun steel drums. As far as post war bikes the only ones I have seen have been made in the shed by very clever people.
I tried sending you a private message but it will not go, possibly because you are a non member. Email me on enw07@btinternet.com after the first week in September and I might be able to introduce you to someone who has made some of these.
I pondered making a ribbed alloy muff for another bike with a pressed /Spun steel hub the two points I thought of were there seems a slight taper on the outside of the drum so I would have to replicate that inside the muff (possible) or machine the outside of drum paralel (not a good idea?) the second pont is on a seven inch drum as the alloy expands faster than the steel drum when hot I guess I would need a lot of interference( just how much?) and I guess that would distort the drum so it would need a inner skim and as the spokes also fit to the drum that would have to be done after building. anyone done this and got any figures?
I owned a Rapide back in the 70’s that had finned alloy muffs on the front brakes. Don’t know any of the details as they were on the bike when purchased.
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