"Łożyska rowerowe" to kit?! Czy łożyska z wiertarki będą tak samo dobre?

Is it worth paying extra for dedicated bicycle bearings when an industrial 6902 bearing retails for less than 10 złoty? We debunk myths and explain it from an engineering perspective. A bearing in a drill rotates millions of times, but in a bicycle, its biggest enemies are water, corrosion, and lateral loads. We dissect LLU seals, explain the use of Mobil SHC460 marine grease on both sides, and debunk the myth that manufacturers are being malicious with non-standard dimensions (e.g., 15267).