Rotor has typically been the only consistent option for 155mm crankarms. I noticed recently that Cobb is making 155mm cranksets that are compatible with the SRAM/Quarq 8-bolt spider option. Not sure of QA/QC on the Cobbs as I’ve seen some past posts of buyers having issues.

Verve Infocrank just announced an updated version of their PM cranskets that are available down to 155mm. They are offering reduced pricing at several first-come-first-served levels that make the pricing a bit lower. Not sure these would be out in time for your build.

Appreciate it. Sounds like Rotor has been the bigger player in making these short crank sizes. I'm sure Cobb will come on board in the future, but being a smaller outfit, they have a longer development timeline is my guess. Thanks again!

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Cheers, Ray

I have a set and did trial Rotor 155 cranks but too short for me. Rotor also make standard Shimano and Sram specific chainrings if you do go down the Sram AXS route.

https://rotorbike.com/...atible-bcd110x4.html

I bought a new ventum with SRAM red. I had to purchase 155 cranks from Rotor and a new BB.
I sold the SRAM crankset/PM

I have power pedals so Rotor was fine.

Good to know thanks so much. Sounds like I'd just need my LBS to install a new BB and I'd be good to go with the Rotor 155 cranks. With or without power is ok with me. If without, I'll just use PM pedals.

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Cheers, Ray

Cyclenutnz wrote this blog post on proportional cranks, which are often <165mm for many folks, and would probably know about the latest and greatest in availability.

Why would you need a new bottom bracket?

What a great article. Thanks for the link!

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Cheers, Ray