Standard Duty or Heavy Duty?

[dave1701]

I was looking for a place to buy pillow block bearings and I have seen "standard duty" and "heavy duty". Will standard duty suffice for my kart axle?

This is what I mean:

http://www.thebigbearingstore.com/pillowblockbearing.html

Which ones should I get?

 

[r_chez_08]

Standard cast ones look fine. I have them on my kart and bike.
Rob

 

[oscaryu1]

Random question, not meaning to threadjack, but is there a maximum "speed" you'd rate these for?

 

[fowler]

u can get low speed and high speed
also the lower quality ones dont hold up as well