Re: Half Step and Granny - which front derailleur?



My loaded touring bike uses half step plus super granny gearing. 7
speed cassette. Either 14-16-18-21-24-28-32 or 12-14-16-18-21-24-28.
Chainrings of 45-42-20. 1991 Deore DX 110/74mm bcd crankset with the
separate washers for the inner chainring so a Avid Microadapter 2
allows the use of a 20 tooth inner ring. Front derailleur is a
Shimano Sora 8 speed double. Bar end shifters.

With a 3 tooth spread in the front rings (45-42 or 42-39), a 12-32 8
speed or a 9 speed with 11-34 or 12-34 will work quite well as half
step cassettes.



On May 18, 7:35 am, "James Thomson" <[email protected]> wrote:
> For reasons I won't bore you with, I'd like to try a half-step and granny
> gearing system. I'm willing to entertain suggestions that it's ill-advised,
> but I'd like to try it for myself all the same, and I have most of the parts
> I need to get started.
>
> Likely gearing will be 45-42-granny at the front, and either
> 11-12-14-16-18-21-24-28 or 12-14-16-18-21-24-28-32 (eight of nine) at the
> rear.
>
> Questions:
>
> What front derailleur would you choose, and why?
>
> Given the above, what size granny would you shoot for?
>
> Shifters will be either older Campag Ergos, Shimano barcons, or downtube
> levers, so front indexing isn't an issue.
>
> Thanks,
>
> James Thomson
 

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