# Crucial grooved bearing **URL:** \ **Category:** General Yo-Yo\ **Created:** [August 25, 2014, 4:02am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890 "2014-08-25T04:02:06Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![m7limey](https://avatars.discourse-cdn.com/v4/letter/m/5f8ce5/32.png) [@m7limey](https://forums.yoyoexpert.com/u/m7limey)\ **Post date:** [August 25, 2014, 4:02am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/1 "2014-08-25T04:02:06Z")
Is the crucial bearing ten ball? And what do you guys think about it? Is it worth buying? ---
**Author:** ![YoCyanightYo](https://avatars.discourse-cdn.com/v4/letter/y/77aa72/32.png) [@YoCyanightYo](https://forums.yoyoexpert.com/u/YoCyanightYo)\ **Post date:** [August 25, 2014, 4:25am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/2 "2014-08-25T04:25:24Z")
Crucial grooved is one of my favorite bearings. I bought 8 of them(They were pretty cheap) and I’m using 7 of them in my favorite yoyos. ---
**Author:** ![N8dogg](https://avatars.discourse-cdn.com/v4/letter/n/a88e57/32.png) [@N8dogg](https://forums.yoyoexpert.com/u/N8dogg)\ **Post date:** [August 25, 2014, 4:26am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/3 "2014-08-25T04:26:54Z")
They’re an 8 ball bearing. I also love and have multiples of them. I like it a lot. ---
**Author:** ![m7limey](https://avatars.discourse-cdn.com/v4/letter/m/5f8ce5/32.png) [@m7limey](https://forums.yoyoexpert.com/u/m7limey)\ **Post date:** [August 26, 2014, 12:13am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/4 "2014-08-26T00:13:52Z")
What’s the difference between 8 ball and 10 ball bearings? Is it sleep time? ---
**Author:** ![Yoyo](https://avatars.discourse-cdn.com/v4/letter/y/41988e/32.png) [@Yoyo](https://forums.yoyoexpert.com/u/Yoyo)\ **Post date:** [August 26, 2014, 12:31am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/5 "2014-08-26T00:31:39Z")
10 balls are smoother but I find they don’t play as well. ---
**Author:** ![m7limey](https://avatars.discourse-cdn.com/v4/letter/m/5f8ce5/32.png) [@m7limey](https://forums.yoyoexpert.com/u/m7limey)\ **Post date:** [August 26, 2014, 2:34am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/6 "2014-08-26T02:34:37Z")
So ten ball bearings don’t sleep longer than eight ball bearings? They just play smoother ---
**Author:** ![andy569](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/andy569/32/1256_2.png) [@andy569](https://forums.yoyoexpert.com/u/andy569)\ **Post date:** [August 26, 2014, 2:38am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/7 "2014-08-26T02:38:32Z")
Personally I think 10 balls do play smoother and do play better. They also last longer in my experience. However they do require more maintenance to keep it at it’s best ---
**Author:** ![FullthrottleFRS](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/fullthrottlefrs/32/1551_2.png) [@FullthrottleFRS](https://forums.yoyoexpert.com/u/FullthrottleFRS)\ **Post date:** [August 26, 2014, 2:42am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/8 "2014-08-26T02:42:36Z")
Pretty much. 10 balls still sleep plenty long, just not quite as long as a good 8 ball. Each ball in a bearing has two contact points, one with the inner race, and one with the outer race of the bearing. Since 10 balls have two more balls, they have 4 more points that are contacting the races of the bearing. This equates to more stability, which leads to a smoother bearing. But more contact points also means more contact area for friction to act on, which in turn leads to 10 ball bearings not spinning as long as 8 balls. That being said, the grade of the bearing also comes into play. An OD 10 ball will generally spin longer than a YYF Spec bearing (8 balls), because the YYF Spec bearings aren’t constructed to as high of standards. ---
**Author:** ![m7limey](https://avatars.discourse-cdn.com/v4/letter/m/5f8ce5/32.png) [@m7limey](https://forums.yoyoexpert.com/u/m7limey)\ **Post date:** [August 26, 2014, 3:54am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/9 "2014-08-26T03:54:44Z")
Not to change my own subject, is the twisted trifecta any good compared to the crucial? ---
**Author:** ![Yoyo](https://avatars.discourse-cdn.com/v4/letter/y/41988e/32.png) [@Yoyo](https://forums.yoyoexpert.com/u/Yoyo)\ **Post date:** [August 26, 2014, 4:09am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/10 "2014-08-26T04:09:44Z")
Bearings all pretty much play the same. Its only when your actually trying to tell the difference that you can. ---
**Author:** ![m7limey](https://avatars.discourse-cdn.com/v4/letter/m/5f8ce5/32.png) [@m7limey](https://forums.yoyoexpert.com/u/m7limey)\ **Post date:** [August 28, 2014, 3:57am UTC](https://forums.yoyoexpert.com/t/crucial-grooved-bearing/68890/11 "2014-08-28T03:57:58Z")
Thanks for helping me decide, I’m buying two of the crucial bearings!