Jan Heine wrote:
>
> By the way, the bolt-circle diameter with the five screws was used by
> other makers as well. Magistroni made steel cranks with the same
> pattern. The Gnutti splined cranks and various French cranks all used it
> as well. I am not sure whether they copied Stronglight (so they could
> use their aluminum rings), or whether the BCD predates 1933. TA started
> by making aluminum chainring, to be used with other makers' cranks, so
> it was natural to use the same standard when they introduced their cranks.
>
Even Shimano had their version of these cranks! -- mvg
Marten Gerritsen
Kiel Windeweer
Netherlands