I use a Sora FD-R3030b to shift a Sugino AT triple and it works fine. The
Sora is designed for a 45mm front chain line so it should work you Silver
crank. I paid $27.99 for the Sora, so it's not much to pay for trying it.
RBW states the Microshift FDs they sell ("skeleton key'??) works with Siver
triples. You can find it at Universal Cycles cheaper than the $34 RBW
wants.
John Hawrylak
Woodstown NJ
On Monday, July 8, 2024 at 9:06:56 PM UTC-4 wong.d...@gmail.com wrote:
> Hello,
>
> I currently have a 2x9 with a 26/38 crank (Silver brand) and a 11/34
> cassette on my Rivendell Clem Smith Jr - H.
>
> I want to add a third/outer chainring (maybe a 44 or 46), which can be
> done by replacing the Silver bashguard with an outer chainring.
>
> I am shopping for a replacement front derailleur (either a Shimano XT M771
> or XTR M971) because I don’t think my Claris FD is capable of a 3x.
>
> I am looking at the specs of both FDs.
>
> The “Front Chainwheel Tooth Difference” is 20T/22T for the XTR and 18T for
> the XT
>
> The “Min. difference between top and intermediate” is 12T for the XTR and
> 10T for the XT
>
> How closely do I need to meet these two requirements? If I get a 46T, I
> don’t meet the Shimano specs. The Front Chainwheel Difference is 20T and
> the Min Difference between the top and intermediate is 8T. Will either FD
> work? I wanted to save money by leaving the 26/28 alone.
>
> On a side note, I don’t plan to use the smallest chaining (26T) very often
> (if ever) as I basically spinout for most of the 9 cogs.
>
> Thank you.
>
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