I'm 69" tall with a 32" inseam. I use 172.5s on my road and gravel bike and 175s on my MTBs. When I bought my newest MTB, it came with 170s. I felt like I was lacking the torque I wanted for low-speed, steep stuff. Replacing the 170s with 175s gave me back the feeling I wanted. I definitely noticed the difference. Switching between bikes, I don't notice a difference between crank lengths. It's more about what each bikes feels like as a whole.
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