Talbot Frameworks Tandem - Sik Fadez Family Chariot

You'd probably end up having to replace all of the chainrings, and with fairly ugly ones as the Shimano 11 speed stuff has all moved to 4 arm cranks.

Also reading the bikeforums thread, are there any tandem hubsets that will take a 11spd cassette?

White Industries make a 11 speed 145 spaced tandem hub.

Also reading the bikeforums thread, are there any tandem hubsets that will take a 11spd cassette?

If not it might be possible to replace the freehub with the SRAM XD driver body and use SRAM 11 speed cassettes.

Maybe.

http://www.whiteind.com/tandem/

So, according to Lennard, I could use an 11 speed chain on 10 speed chainrings or am I misinterpreting things?
Would it then just be as simple as removing the 30t ring from the triple or are things not that simple? Can a di2 front derailleur be set up to accommodate chainrings that have different spacings?

I believe the internal spacing on 10 and 11 speed is the same, it's the external (i.e. total width) that is reduced by making the link-plates thinner.

I've been running an 11 speed chain on 10 speed chainrings for thousands of miles with no issue, so either I have a (series) of magic chains, or it's ok to do it.

Saw this when it was being built up at look mum. So very light for a tandem and kitted out expensively.
Lovely tandem..

What about di2 hub gear?

Edit - I know fuck all about tandems so probably best to ignore the above.

Not generally a fan of the internal hubs. The exception, on occasion, being the Rohloff.

Get a Rohloff.

rohloff and shimano hyrdaulics sounds like a good idea - from the picture it appears it will be a flat bar tandem

Nope, Defo going to have drops :) The pic is just a quick preliminary drawing to see how the geo might look to accommodate both our heights and to get me excited about this. Will sit down with Matt when I'm back in London to thrash things out properly :)
Never had a custom built anything before so this is a new and exciting journey for me.

Any current Tandemers care to comment on how much use they got from their rear drum brake?

I believe that Mrak took his off as he didn't think it was needed, just wondering about the best brakes available for this project - suspect 203mm discs front and rear with R-785 shifters/calipers, and maybe a V-brake on the rear as a parking brake type arrangement might do it.

Assume dem R-785s are tandem rated?

There's a reason why the other mega Calfee Enve tandem in this thread has cable pull brakes :)

@hovis left his on for a while, but I think has since removed it. I took mine off before the bike saw any serious use and haven't really felt the need for the kind of braking it offers. There was only really one time last year I felt that v-brakes weren't enough (going down a twisty twisty mountain, on shit road surface), but the two years previous doing Dartmoor in the wet they were utterly, utterly, dangerously useless. Didn't die, though!

i think the calfee was built before Di2 hydraulics were released

Do Hope still make the boss vented V2 rotors? Reckon they'd be perfect for a tandem.

I've been wondering about those as well,
when I enquired with Paul Components about their use,
they said they wouldn't fit in, too thick.

Just been over in the tandem section of the YACF forum and it seems like double cable pull discs plus one rim brake on the rear (as your bail out brake) is what's most popular now. Reckon having the rim brake mounted out of the way under the BB might be the way to go.
Seems that Hydraulic disc fluid may vaporise if heated enough on long descents.
I have visions of riding this up and then down the Tourmalet safely.

Surely? Ti for once not being the point here.

Seems that Hydraulic disc fluid may vaporise if heated enough on long descents.

Is this the same for mineral oil and dot oil?

Hydraulic disc fluid may vaporise if heated enough on long descents

A good reason to fit a proper rear brake to share the load. Though I find it surprising, high dot brake fluid boils at over 200 degrees I think.

At different temperatures, but essentially yes. @skinny managed to boil his brakes coming down a mountain in the TCR.

A good reason to fit a proper rear brake to share the load

Or fit some brakes that won't fail catastrophically :)

Though I find it surprising, high dot brake fluid boils at over 200 degrees I think.

There's just a lot of energy to burn off on a fully loaded tandem, and the volume of fluid in a disc brake is tiny. When you consider the ambient temperature might be 30 deg or so and the descent might take thirty minutes or more, it's not so hard to believe.

The plastics on BB7s typically melt when used on a tandem I've heard.