• based on Litepro 53T chainring with integrated chainring guard
• integrated spacer of 1.5 mm, plus an ordinary chainring stacks to about 5 mm spacing between the closest wall of the guard & the outboard face of the chainring
  • this, plus my presumed 39 mm chainline meant that I wouldn't get rub in either extreme of a 10 speed cassette on the chainring guard features, on either side with the chain at a diagonal
    • this also coincides with the chain not derailing off the chainring (this naturally gets worse as the chainring wears)
• tested fit with this chainring adapter
   

Revisions

• don't bother printing R2 because you'll have a hard time fitting bolt to nut – it just barely works
  • R3 has a 2 mm deeper CBORE, which should greatly help with this
  • I didn't measure my chainring bolts & nuts, but I suspect they're the size for a typical road/mountain double ring setup

R3

R4

• better visualization added of common, perhaps even standard chainring bolts
• the CBORE depth is tied to these dimensions to avoid fitment issues encountered in R2
•  

R4.1

model adjusted for this strange 13.3 mm threaded length extra long chainring bolts I found

Chainring hardware dimensions

• for “standard” double crankset sizes, I think
• M8 x .75 thread used on chainring bolts

Bolt dimensions

Nut dimensions