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Update – Roy’s S&S Coupler Titanium XACD Tandem: the design stage part 2

Roy is still working hard on his tandem project, this time looking at the finer details, I said I’d be happy to pop another post up and see if anyone has any thoughts (click on the images to enlarge)…

More thoughts on Roy's tandem frame, this time he's thinking about lots of bottle bosses to fit frame bags.

More thoughts on Roy’s tandem frame, this time he’s thinking about lots of bottle bosses to fit frame bags.

 Multiple bottle / internal bag mounts (ref the English divide bike)

Seeing how many there were on the frame I thought Roy must be planning a desert trip, but having seen the English bike (below) I now see what he’s up to! Integrated frame bags seem a fine way to make use of the space (side winds excepted!). I’m guessing that Roy’s already got a contact for some custom bags.

An integrated rack on the forks.

Is a nice touch as it adds that extra ‘handbuilt bike show’ feeling to the frame 🙂 Roy could even do a matching rack on the back too!

Headtube diameter not looked at that in detail yet…

For the truss fork I think Roy will be restricted to a standard 1 1/8″ headset which will mean a pretty normal headtube. If he was using a standard fork then I’d probably suggest a taper or even a straight 1.5″ headtube to allow for the greater weld area and headset choice.

Rob English does the most beautifully detailed, integrated, frames. This is his take on the issue of integrating luggage carrying into a touring frame.

Rob English does the most beautifully detailed, integrated, frames. This is his take on the issue of integrating luggage carrying into a touring frame.

Brake mounts & dropouts – I’m looking to include BOB trailer bolt eyes outside the dropouts which, taking into account the Rohloff shifter box etc, make for a lot of ‘test clearance’ lines on the drawing and I’m not yet convinced they’re right.

I see what he means, there’s plenty going on to try and fit it all in! Making the dropouts removable/bolt on could be an idea as it would allow for greater choice and help relieve the pressure of getting everything right first time.

Cable/tube guide positions – facility for both Rohloff & standard gears for ‘just in case’ scenarios. These might go back onto the top of the tubes.

I think side mount probably looks the best, along the top might be a bit untidy, although that’s how I ran it on my MTB frame. I’m interested to see if Roy is running full length outers, if so he’d have to keep the two halves  of the frame close together when it was split for transport.

Putting cable stops either side of the S&S coupler would allow for daVinci Cable Splitters to be used (as below). I guess cable disks would make sense too…

daVinci cable splitters - perfect for S&S equipped frames.

daVinci cable splitters – perfect for S&S equipped frames.

Non drive-side view showing cable and hose runs.

Non drive-side view showing cable and hose runs.

What do you think? Is Roy thinking along the right lines? Do drop me a line via the Contacts page if you’d like to comment…