Ask Mitch on the Trek community relations page

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http://www.TriScottsdale.org

For what it's worth I have Rotor 3D24 cranks on my Speed Concept 7 and they work completely fine

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Disclaimer: Not a triathlete anymore, just a fish

The Rotor 3D24 crankset is a direct replacement for Shimano cranks on a Speed Concept.

"Rotor crankset" is a generic term that could mean two different sizes. If it's a 24 mm spindle, you're good to go. If it's a 30 mm spindle, that's a no.

I heard my name here, so I ventured from my confines of the SC official thread.

Rotor makes cranks that can fit your SC, but you have to make sure they fit your BB90 that was designed for a 24mm crank spindle. If you don't know which one you are looking at, best to reach out to Rotor and tell them what spec you need. Otherwise, feel free to share it here so we can all get a better sense of which one is in question. For a Tri specific crank, the Aldhu can work as they offer a 24mm spindle.

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Mitchell Mathews | Community Manager | Trek Bikes | @mitchmathewz

Thank you all so much!!!

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Merge Multisport Founder & Head Coach
USAT Level 2 - Short & Long Course
Ironman Certified
Brevard, NC

Rotor ALDHU24

Dropped rotor a message Facebook cause I'm facing the same issue. I've attached the reply here. The Aldhu 24mm spindle will fit.