Originally Posted by twocicle

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