Re: [RBW] Re: Gus front derailleur reccomendation needed

'Scott Luly' via RBW Owners Bunch Sat, 03 Dec 2022 17:01:31 -0800

Probably a typo on your part?

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  On Sat, Dec 3, 2022 at 5:57 PM, Jacob Byard<jacob.by...@gmail.com> wrote:   
In my notes I had 123mm written down. So who knows how I came up with that. I 
have notes everywhere. Like a crazy person. I’m ordering a 113mm now and will 
swap it out. Going narrower will probably help my knees too. 
Cheers,
Jacob

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On Dec 3, 2022, at 7:44 PM, 'Scott Luly' via RBW Owners Bunch
<rbw-owners-bunch@googlegroups.com> wrote:

A spindle length of 107mm should give a chain line of 47.5mm (which is kind of
standard, if I'm not mistaken) and 113mm a 50mm.
I run a 113 because I like to run my rings a scratch more outboard.
I'm not a subject matter expert, but a 123 BB sounds very long for a triple
set-up, or even double.
Service Instructions for my Shimano FDs indicates recommended chain line for
various Shimano BBs and 123 isn't even on the list. I can double check when I
return home and send you the chart I have.

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On Sat, Dec 3, 2022 at 5:18 PM, Jacob Byard<jacob.by...@gmail.com> wrote: I
just checked and it’s a 110 BCD on the big ring. I’ve got just under .5” of
clearance if I’m in the small/ big combo. So I should be fine swapping in a
narrower BB.
I’ll see about picking up one of the m737 or m563’s
Thanks for the help!

Cheers,
Jacob

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On Dec 3, 2022, at 6:46 PM, Justus G <cjust...@gmail.com> wrote:

If you look for a good condition old stock XT M737 or LX M563 you should have
a perfect match for your ring sizes, a small/short enough cage to not hit the
stays and enough range for the triple. I am currently using this setup with a
110/74 Ritchey Triple that I run with a Phil ~119mm BB. But you may not need a
new FD anyway.
Is your crankset the Ritchey Logic 94/58 Compact? If so, that is meant to be
run with a 110-113mm BB so if that is the case my concern is you are out of
range due to the extra length which will also effect chainline.
My recommend is to measure and see if a 113mm BB will work (need 5mm vs what
you have now to tire) and go to that. Perfect chainline. Great Q-factor.
Prefect.

On Saturday, December 3, 2022 at 4:57:38 PM UTC-6 jacob...@gmail.com wrote:

Hello good people,
I'm finishing up my Gus build and the front derailleur from my stash doesn't
work. I'm using a triple crankset (42/32/22 Ritchey) with a 123mm bottom
bracket. 9 speed in the back and a 2.25" rear tire.

I actually bought a Shimano FD-M780 but it was the braze on style (mistake on
my part). When I got the clamp in and everything mounted it didn't seem to have
enough throw to push into the big ring. I'm pretty confident I had everything
installed correctly.

The Skeleton Key FD on Riv says a 118mm BB.

If I change the BB to something narrower will I run into tire clearance issues?
I don't plan on going larger but it would be nice to have the option.

Thanks for any insight!
Cheers,
Jacob

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Re: [RBW] Re: Gus front derailleur reccomendation needed

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