Today I’m buying a new bearing but I don’t know weater to get a kk or a center track
I really just want to know whick one helps for a better sleep time because I already know what both of them do

None. Bearings are bearings are bearings; no matter whether they are flat curved or angled.

You have a Skyline I presume?

If so, you don’t need a new bearing. You won’t notice a change in spin time with a new one, and the Skyline already spins longer than you need it to.

How’d u know that I had a Skyline
And thanks just wondering

It says so next to your favorite yoyo.

center trac