Would only need the P2M spider if I stuck with 3D24. Any real upsides to 3D+? Such wattage, etc.
No. If you've got the 3D24 cranks already, stick with them.
@Brommers started
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Would only need the P2M spider if I stuck with 3D24. Any real upsides to 3D+? Such wattage, etc.