Pyramid, although you will need to use a non-Shimano chain, or at least a non-Shimano quick link. They explain in the FAQs.

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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

Thanks! I just saw someone post a photo of one coincidentally. Will look into that as an option and check out the FAQ

Alugear, Garbaruk to name a few. The Alugear looks really nice with the matching cover , Rotor goes up to 56 for a 2x but I guess with wanting a 58 you are looking at a 1x option.

Jeroen

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Owner at TRIPRO, The Netherlands

We (AeroCoach) make 58t Aten (our aero chainring range) Shimano 12spd for 1x and 2x, as well as a 60t 1x option if you want it too.

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AeroCoach UK
http://www.aero-coach.co.uk

Do they fit SRAM cranks?

Yes we make rings for SRAM 107bcd 4 bolt, just not the 60t 1x option

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AeroCoach UK
http://www.aero-coach.co.uk

I just rode the Aten at 24 Hour World TT champs. Definitely take a look at their site as there are marginal gains there. Fitment is gorgous and the big NW teeth have been flawless for me over 1000+ miles. No chain catcher needed here!

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24 Hour World TT Champs-American record holder
Fat Bike Worlds - Race Director
Insta: chris.s.apex

Ah superb! Thanks for the feedback :)

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AeroCoach UK
http://www.aero-coach.co.uk

@xavier I thought I read somewhere that Quarq power meters don't quite fit the Aten. Is that correct?

130bcd non hidden bolt Quarqs can fit Aten rings fine, as well as 110bcd 4 bolt DFour. What doesn't work is 130bcd hidden bolt, 110bcd 5 bolt and also direct mount (but 107bcd 4 bolt is okay).

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AeroCoach UK
http://www.aero-coach.co.uk

Awesome, thank you for the quick reply. I have the 110 bcd 4 bolt, so it looks like an upgrade is in my future.

Sure thing. The only issue we've found with 110bcd 4 bolt cranks is the SRM Origin cranks: we couldn't get a design to work well without it being a completely separate option (which would have been too expensive!).

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AeroCoach UK
http://www.aero-coach.co.uk

Any 11sp chainring should work btw. Ive been using my old crank on my 12sp road bike for over a year now

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IG - @ryanppax
http://www.geluminati.com
Use code ST5 for $5 off your order

Thanks for the info - I think aerocoach seems like the best option if I can get it in time.

For the 11sp chainring - you are just running the chainring as 11sp, cassette and chain remain 12sp correct? I assume the risk is some inefficiency/risk of dropping due to chain link spacing?

That's correct. i was cheap and didnt want to buy a new crank so i brought my 105 crank with 11s ultegra rings off my old bike

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IG - @ryanppax
http://www.geluminati.com
Use code ST5 for $5 off your order