bearings?

Hi, has anyone fitted pyramid (make) tapper head stock bearings? did they fit ok? only I read somewhere the some of these aftermarket bearings didn't fit well and can't remember what make they were Thanks

OK who is technical and can explain wheel bearing credentials? After reading many posts regards this matter it appears we need 6205 - 2RS1/C3 bearings. The bit I don't understand is the RS1 bit, I can find RSR etc... so what's the difference? Does anyone know what size seals we need front and...