I hope you tandem building is more successful than your thread creation.

No reason to be snarky. His image can't seem to be direct linked. You can see it here:

https://ibb.co/nrOYVk

That geometry looks mighty racy for a tandem. Is this for Wednesday Night Worlds? Also, are you getting the awesome looking aero downtubes?

Thanks for the help.

Was having major computer problems

To late for Richards new aero tubes, they are impressive though. Frame fits us perfectly, its is very comfortable to ride, it is so responsive it's like riding a half bike.

How long did the process take from initial conversation to deposit to frame delivery?

Did you finish the build already? If so, please post some photos. I would like to know more about the rear flat mount. for the disc brake. Did the chainstay require reinforcement?

I realize that you're using eTap. Have you considered adding internal routing for Di2 compatibility, just in case?

Hi,When I first contacted Richard in the middle of Sept. and presented what I was interested in regarding the frame geometry and weight, he replied back that he was more than capable of fulfilling my wishes. So we proceed on with the price, deposit & contract. The frame design went multiple times back an forth, with Richards cad drawings until I finally agreed upon the design. I can't say enough how professional Filament Cycles handles there business. A delivery date was set for the 1st. week of March and that's when the frame arrived.

One of the 1st things I did in regards to building the tandem was to contact Tim at Lightning Dymanics and provided him with my design for a right side drive system. They did a great job in manufacturing the parts and tolerances need.
https://imgur.com/a/oa12g

I don't know... had I seen the o.p. when that other poster did I might have been inclined to be snarky too. I mean... what kind of cyber sleuth should one have to be to determine an o.p.'s message? No text even? Just a link? An invisible link? And not even an accurate thread title since it seems like the project has been completed.

Glad to see you took the spacer/offset ring idea to heart in order to provide a stronger and stable base for the timing ring. Plus you use that as a Compact 110bcd -> 130bcd adapter for the gates timing ring. Unusual, but it appears to work.

As I had previously stated I was having major problems on my computer, my server was going crazy and would not finish anything I tried to do.
As far as not being a accurate title I totally disagree with you, myself when ever I'm having a custom frame built the first phases is getting the geometry and design dialed in to my specific needs, which doesn't happen overnight. Where ever did you get the idea that it seems like the project has been completed? The bike is rideable but I'm still sourcing parts and waiting for release of components from SRAM. So "First Step in creating. Custom tandem" are in play.

twocicle I couldn't be happier how the design turned out, being able to achieve a dual purpose with a single hack. After finally getting the correct chainline set which was a process, I had to shim the Gates timing ring with only mm to play with to move the belt outboard to achieve a bit more clearance from big chainring.

Snarky has nothing to do with it. A blank thread was what my comment was about. Thanks for posting the hidden link.

You're welcome.

Being retired, I had the time to scavenge the link form his blank post. Besides, I wanted to see the pic!

That crank looks seriously nice. Could you please explain the respective BCD, as twocircle pointed out, there appears to be a combination of 110 for middle and inner and 130 for the Gates. What does the spider look like?

I'm still working on finishing the build, I'm waiting on my wheelset and SRAM to release there HRD brake set and shifters As stated by SRAM June/July release, seriously opposed to there early Jan/Feb release by both SRAM and Shimano TYPICAL of both. Filament chainstay design is very robust and designed for disc brake usage As far as DI2 usage to late for that all tubes are sealed with no modification possible. We used DI2 on our last Macchiato which performed flawless. I choose to use SRAM this time around for a number of reasons. Will post pictures when finished.

I think he is actually using a compact 110bcd double spider with the 52/36 chainrings mounted in the normal positions, then tacking on the spacer ring to the outside + the gates ring.

While this implementation cantilevers a lot of stuff on the outside of the spider tab (more so than when using a triple spider), with the spacer ring mated next to the big ring it makes for a solid spider connection and a good foundation for the gates timing ring.

It must have been tricky to figure out the fitment of the chainring bolts attaching the gates ring to the spider and not hitting the 52t chainring. Perhaps the inside of the spacer ring has counter sinking for the bolt heads?

Then for the captain's timing ring to align with the rear, guessing that it has an extra thick spacer ring mounted directly to the front spider?

[QUOTE=twocicle;19513177]I think he is actually using a compact 110bcd double spider with the 52/36 chainrings mounted in the normal positions, then tacking on the spacer ring to the outside + the gates ring.

While this implementation cantilevers a lot of stuff on the outside of the spider tab (more so than when using a triple spider), with the spacer ring mated next to the big ring it makes for a solid spider connection and a good foundation for the gates timing ring.

It must have been tricky to figure out the fitment of the chainring bolts attaching the gates ring to the spider and not hitting the 52t chainring. Perhaps the inside of the spacer ring has counter sinking for the bolt heads?






twocicle nice description of the process with a few different caveats, the spacing ring is 6mm wide and machined perfectly to mount the Gates ring 130bcd so it would be supported by the spacing ring and the chain ring bolts, the spacing of the Gates chain ring bolts where centered between 110bcd spacing where the chain ring is relieved upwardly which created space for the chain ring bolts, no counter sinking. Also had to use longer chainring bolts to put it all together.
For the stroker crankset the chain centerline line was set to 45mm which allowed me not to use the 5mm Torx spacer that Lightning provides, which also gave a smaller Q factor. To alignment the captains timing ring with the rear it worked out quite well all I had to do was add the torx 5mm spacer to the front crankset and a couple bearing cup shims to have equal spacing of the crank arms and a good alignment with he rear. Also using 110bcd spider from Lightning.
https://imgur.com/a/dH0fz

So after the plans were agreed upon and signed off, Filament got busy and built the frame, as shown the tubes have been cut and assembled, pictures show the fillet work that had been done for smooth transition between tubes, and the pre peg wrap after coming out of the oven which cures all joints and gives strength to the frame. Very happy with the frame weight at that point!

https://imgur.com/a/yq6zG

[QUOTE=Bad1;19513350]What is the Q factor for the stoker?
I have done a similar configuration with DA7800 cranks but with a timing chain. There was barely enough room to fit a 10sp timing chain in between the crank arm and large chainring.

[QUOTE=Dean V;19538805]Q factor ended up being 164, the gates belt is 3 1/2 mm off the large chain ring and 1 mm off the inside of the crank arm, it is one tight fit the belt doesn't rub on the chain ring when using all the different sprockets on the rear derailleur.
Totally enjoying the response feel of a right side drive.