gravel carbon crankset compatible with grx chainrings

[jmeld]

Are there any carbon cranksets that have or can be adapted to a grx chain line (151 q-factor iirc vs 146 for road) and accept grx chainrings? I find Shimano's grx line of cranks fairly limited in crank length options and am curious to try something a bit lighter. Any suggestions? From what I see of the carbon cranksets on places like pandapodium, they typically use a road chain line, a 30mm axle, or the spider is a road 110 bcd. Is there any alternative to just running the Shimano cranks?

[pdlpsher1]

I’m using the Rotor Aldhu Carbon 155mm cranks paired with a P2M GX PM and Shimano GRX chainrings. Rotor cranks (the light versions) are modular and you could use either a standard or an offset spindle to get the correct chain line. I use the standard spindle on my road bike and the offset version on my gravel bike. For either setup you’ll need a thinner BSA30 BB cup. This is an issue with the specific PM and not the cranks themselves. Not sure if P2M has fixed the issue.


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[jmeld]

Thanks! Looking over the product page, https://rotorbike.com/rotor-aldhu-carbon-cranks.html, it's not clear to me how I get the offset spindle. D̶o̶e̶s̶ ̶i̶t̶ ̶c̶o̶m̶e̶ ̶w̶i̶t̶h̶ ̶t̶h̶e̶ ̶c̶r̶a̶n̶k̶s̶ ̶o̶n̶ ̶p̶u̶r̶c̶h̶a̶s̶e̶?̶ ̶I̶f̶ ̶s̶o̶,̶ ̶i̶t̶'̶s̶ ̶u̶n̶c̶l̶e̶a̶r̶ ̶w̶h̶e̶r̶e̶ ̶I̶ ̶r̶e̶q̶u̶e̶s̶t̶ ̶t̶h̶e̶ ̶o̶f̶f̶s̶e̶t̶ ̶v̶s̶ ̶s̶t̶a̶n̶d̶a̶r̶d̶. Oh, I think I've found the spindle product page: https://rotorbike.com/rotor-road-gravel-axle-24-mm.html

[pdlpsher1]

Only the alloy cranks use the 24mm spindle. For the carbon cranks you need the 30mm version. I bought mine in N.A. so I just sent an email to the N.A. P2M (not Rotor) distributor listing the parts that I needed (Rotor carbon cranks, spindle, and P2M PM), and they generated an invoice for payment. P2M is a partner with Rotor. So you could order any Rotor cranks directly from P2M. If you're not buying a PM then you'll need a compatible spider that will fit the Rotor carbon cranks and the Shimano GRX chainrings. I believe one does exist but I don't know the name. You don't want to use any Rotor branded gravel chainrings. I've gone that path before and it didn't end well. Stick with Shimano chainrings.

https://rotorbike.com/rotor-road-gravel-axle-30-mm.html

[DJT21]

I believe SRAM do a "wide" version of their road chainsets, which have a wider chainline. Alternatively, the XPLR chainset also has a wider chainline. You could then use a Shimano compatible SRAM spider, which seem to be available on Aliexpress.