Slightly fallacious argument...unsealed bearings were the only bearings for the first 150-odd years of cycling. To suddenly call them 'unsuitable' is a bit misleading. They're fine for any application - but require a little more (regular) maintenance to keep smooth when there's dirt about.
Slightly fallacious argument...unsealed bearings were the only bearings for the first 150-odd years of cycling. To suddenly call them 'unsuitable' is a bit misleading. They're fine for any application - but require a little more (regular) maintenance to keep smooth when there's dirt about.