taco eater :
Nele Sudar from Omaha, NE United States
These bad boys will spin smoothly to 13k rpms easily, but the problem that youll encounter is theylll wear out after daily use after a season of riding, itll give side to side play to the crank, allowing it to walk, ive also found that machining tolerances were bit loose for polini cases, allowing them to almost fall in and out of the case. Ive had plastic ball bearing retainers fall apart on a peugeot malossi build with same bearing .. go with skf....
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Not on a moped, I use these bearings at work
August 11, 2011
taco eater :
Max Johnson from New Bedford MA
FAG bearings, aside from their unfortunate name, are fantastic bearings, and hold up under constant use. Of course, we use em on a labrotory grade testing machine to support a whirling mechanism that uses a complex array of one way bearings, shafts, and #25 chain to very precisely roll up a sock. The machine sells for upwards of $25,000. And you thought Metrakit parts were expensive.
Great smooth bearings but will wear out after few 
Not on a moped, I use these bearings at work