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power2max Gravel Power Meter Comparison

power2max makes two similar versions of its gravel power meter crankset. The p2m ROTOR ALDHU Gravel Power Meter Crankset and the p2m ROTOR ALDHU Power Meter for GRX Chainrings.

These power meter cranksets are very similar. They are both direct replacements for a Shimano GRX crankset. They feature GRX chainlines, use 24 mm spindles and fit Shimano 24 mm bottom brackets. However, there are some key differences too, as outlined in the table below.


power2max Gravel Power Meter Comparison Table

p2m ROTOR ALDHU Gravel Power Meter p2m ROTOR ALDHU Power Meter for GRX
Cost $750 – $820 $790
Power Measurement Both legs Both legs
Spindle 24 mm 24 mm
BCD 104 110/80
Chainline GRX 47 mm GRX 47 mm
Q Factor Narrower Standard GRX
Chainring Configuration 1x or 2x 1x or 2x
Chainring Included Yes No (sold separately)
Chainring Aftermarket (power2max/ROTOR)  Shimano GRX
Chainring Sizes 38T, 40T, 42T, 44T, 46T, 46/30T, 48/31T 40T, 42T, 48/31T


Key Differences

The main difference is the chainrings. The p2m ROTOR ALDHU Gravel Power Meter uses a power2max (actually made by ROTOR) chainring (included), whereas the p2m ROTOR ALDHU Power Meter for GRX is made for a Shimano GRX chainring (sold separately). If you want to keep your drivetrain as much Shimano GRX as possible, you might opt for the GRX version. However the power2max/ROTOR gravel ring works great too and has the added benefit of a larger range of chainring sizes.

The other notable difference is the Q Factor (also referred to as offset or stance). This refers to how far apart your pedals are. While the GRX version features a standard Shimano GRX Q Factor, the power2max/ROTOR version uses a slighter narrower (road) offset. Some customers prefer this narrower offset, but this too is personal preference.

Regardless of which version you chose, you’ll have a wonderful power meter crankset. We use p2ms on a number of our own bikes here and highly recommend them.

Josh Matthew


  1. Jordan


    Great information you’ve provided in helping me find a power meter. I have a question before I pull the trigger on a power2max NGeco – and I see the two options tot sell, with rings or without. have a Trek Checkpoint SL5. Does the wider chain line matter? Won’t the front derailleur be also 2mm further out? I like the idea of getting a bigger front chainring than currently exists on the GRX 600 crank, but want to make sure it’ll work seamlessly. I’ll also be replacing the stock 175mm crank with 165s for a better fit.



    1. Dave Harris

      Hi and thanks for the question.

      As this is a fairly long explanation, I followed up your question via email.

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