The best replacement for 172.5 is 170 cranks.

The best alternatives to 172.5 are rated as following:
★★★★★  170 cranks
★★★★★  175 cranks
★★★★★  175
★★★★  175mm cranks
★★★★  175 crank
★  175mm crankset
  170

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172.5
170 cranks
175 cranks