Is anyone making narrow-wide 1x rings for Campag 4-arm cranks yet?

[AngryScientist]

As per title, are any of the aftermarket companies making 1x rings for campag 4-bolt arms yet?

[cgolvin]

Realize this isn't answering your question, but from what I recall the BCD of Ekar and the Chorus 12 sub-compact cranks are the same, so I think you could use an Ekar ring with that particular 4 arm Campy crank.

[SDJ]

and I would like to ask the same for old style 5 arm carbon cranks with hidden bolt (record/chorus)

Thanks in advance for any tips

[AngryScientist]

Originally Posted by cgolvin

Realize this isn't answering your question, but from what I recall the BCD of Ekar and the Chorus 12 sub-compact cranks are the same, so I think you could use an Ekar ring with that particular 4 arm Campy crank.

That's interesting, I didnt know that. It does further complicate things that currently there are apparently a few different 4-arm Campag BCDs. The regular 130ish, the subcompact chorus, and I assume something different for the newest super record and those subcompact options.

Originally Posted by SDJ

and I would like to ask the same for old style 5 arm carbon cranks with hidden bolt (record/chorus)

Thanks in advance for any tips

There is an easy enough workaround for that.

[SDJ]

So normal 110 bcd and filing down the offset hole?

I have a standard 110 bcd narrow wide incoming and was gonna file it to test but wanted to check if there actually are campy specific 1x rings

[Grifter23]

The only company off hand that makes Campy chainrings that I have used is Gearoop KOM challengers. You might be able to get them to work. It’s not cheaper if that is what you’re trying to find.

[SDJ]

Been looking at gearoop for their sub-compact over the years but never gone for them.

Didn’t know they also did 1x specific chainrings for campa 5 arm.

[cgolvin]

Originally Posted by AngryScientist

That's interesting, I didnt know that. It does further complicate things that currently there are apparently a few different 4-arm Campag BCDs. The regular 130ish, the subcompact chorus, and I assume something different for the newest super record and those subcompact options.

Not having success with searching, but somewhere there's a post (maybe from Mark McM or benb) giving the BCDs of all the above, that is where I learned about the Chorus & Ekar common BCD.
Edit: found it, twas Mark McM:

Ekar and 12spd Chorus share the same 123mm BCD and and can share chainrings, but Super Record WRL has different BCDs ( 121mm outside/88mm inside), so it can't share chainrings with any other group set.

Note: For Chorus cranks, the cranks themselves have no bolt holes for the inner chainring, but instead the inner chainring bolts to the outer chainring on a 96mm BCD. So technically you could use an Ekar crank as a 2x crank with Chorus chainrings. However, the Ekar rear derailleur is not compatible with a 2x drivetrain.

[AC0]

Stone chainrings make rings for Ekar (and chorus).

https://stonechainrings.com/product/...eed-c13-chain/

AC