Front derailleur for Hubbah tandem with Silver tandem crankset?

[Mark Roland]

Assembling my tandem and whoops. Forgot a few little bits.

I called Rivendell today and they recommended 118 bottom brackets  and an XT FD  M781 Ax6s front derailleur for the Silver Riv tandem crankset. They don't have any more of these derailleurs, but I found some on eBay. Just need to know, am I looking for a 31.8 or 34.9 clamp? And do those extra letters and number (Ax6s) designate anything? Google is not saying.

[Robert Tilley]

I used the M781 on my HHH. Mine came with shims so it would fit multiple sized tubes. The size needed is 31.8 since that is what my seat tube measures. No item number but the description on mine read "Shimano FD-M781 High Clamp Front" .

Robert Tilley

San Diego, CA

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From: absolut...@gmail.com Sent: September 3, 2020 6:09 PM To: rbw-owne...@googlegroups.com Reply-to: rbw-owne...@googlegroups.com Subject: [RBW] Front derailleur for Hubbah tandem with Silver tandem crankset?

Assembling my tandem and whoops. Forgot a few little bits.

I called Rivendell today and they recommended 118 bottom brackets  and an XT FD  M781 Ax6s front derailleur for the Silver Riv tandem crankset. They don't have any more of these derailleurs, but I found some on eBay. Just need to know, am I looking for a 31.8 or 34.9 clamp? And do those extra letters and number (Ax6s) designate anything? Google is not saying.

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[Nick Payne]

Shimano clamp-on MTB FDs all come with a 34.9mm clamp and two sets of shims - one set to fit 31.8mm seat tube and the other to fit 28.6mm.

Nick