Diechrome wrote:
Not to highjack this tread, but does anyone know of a spider based power meter that would work with the new GRX 2x crankset? This crank has a little wider Q-factor of 151mm. I have it on my OPEN U.P. which doesn't have room for a crank arm option such as Stages. I'm using the XTR pedals with the shorter spindle so the Q-factor ends up being the same as my Speedmax.
There aren't any "spider based" power meters that work with current Shimano road or gravel cranks because those are spiderless cranks.
If you're asking about a replacement crankset that works with the GRX front derailleurs, Rotor Aldhu & Vegast crank arms can be paired with a wider "road disc" axle which results in a 152mm Q-factor & a 46mm chainline. That's close enough to GRX's specs to work (within 1mm). Rotor has their own spider-based power meter you can use, or you can use a Power2Max NG or NG Eco. As of right now, there aren't any subcompact chainring options that can be used with either of those PM's, although somebody above suggests p2Max has something coming soon.
The other option is to go with whatever conventional road crankset you like, with conventional road chainline and q-factor, and swap out the front derailleur for a road front derailleur.....although you might lose some rear tire clearance with this option.
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