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@vpCogworks
Got a CrMo bike with a stuck alu seatpost.
More leverage = more better, so I bought a 36" (90 cm) pipe wrench. The seatpost got loose very easily. However, It was a real PITA to set the wrench up so it would hold on properly. I guess the bigger the wrench the bigger the teeth (and the gaps between them), so in retrospect I'd choose a 18" or 24" instead, and add a cheater bar if necessary.