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To be honest i ptobably wouldn't mind doing it on anual or semi anual basis but my last big daytrip was August 2019, just after changing bb. Since than my daughter was born and the bike was mainly doing commutes and shopping trips.. max 20km daily. Now my experience with external bb's is very limited and I might have a bias, but i've never had any ptoblems with squate tapered ones. Never bent one, never got one stuck on me. I think last time i had to change it was after 5 years on daily beater.
I'm growing tired of gxp bb on my do everything bike. Its a second time i need to replace that in 3 years. And I'm not agressive or fast rider. Also bike is always stored indoors. So while I have deore bb52 and adapter coming in mail some time January, I can't help but wonder if I'm better off just sticking square tapper bb in there (a la un55) and some old mtb crankset. Provided I'd use it with 32-38t narrow-wide, any recommendations on cranks? Cheaper is better, but quality is pretty important.