Safe high speed bearing..?

[Slipnride]

I have been using regular 5/8" bearings for my minibikes and am curious if anyone has any good info on a safe top speed with these bearings. Im running an animal and mod gx200 that go an excess of 70mph and want to know if anyone has had bad experiences with these bearings or has a better alternative.
Thanks

 

[graygoose420]

If its the regular sealed bearing you should be fine. I pass 70mph easy with no problems . I swap mine out every 6 months, but I race a lot.

 

[Slipnride]

Thanks, exactly what I was hoping to hear.

 

[finkawhile]

ball Bearings that size will go up to around 15000 rpm depending on if its grease or oil lubed under full load. So depending on tyre outside diameter that could be as high as 300mph with a load of 3 times your weight.