Description
Reviews
| Brand | - |
| Category | Industrial Small Parts / Bearings & Bushings |
| Origin | - |
| Material | Stainless Steel |
| Bearing Model | R188 |
| Inner Diameter | 6.3 mm |
| Outer Diameter | 12.7 mm |
| Width | 4.7 mm |
| Groove Type | U-Groove (Concave) |
| Performance Style | Dead Sleep |
| Lubrication | Unlubed (Factory) |
| Package Quantity | 5 Bearings |
| Origin | Imported |
Anonymous
Apr 15, 2026
Rating: 5/5
Smooth and quiet
Very quiet spinning compared to my old ceramic bearings. The U-groove makes the yo-yo feel responsive when I need it to bind. Highly recommend for beginners.
Anonymous
Apr 06, 2026
Rating: 5/5
Perfect for dead sleep tricks
These bearings are incredibly smooth right out of the package. I installed them in my aluminum yo-yo and the sleep time is impressive. Great value for a 5-pack.
Anonymous
Mar 06, 2026
Rating: 4/5
Good but needed cleaning
The bearings worked well, but one had a slight gritty feeling initially. After a quick clean with citrus solvent, it spun perfectly. Otherwise, great product.
Anonymous
Mar 02, 2026
Rating: 5/5
Reliable stainless steel
I prefer stainless steel for durability. These hold up well against humidity and sweat. The dead sleep characteristic is consistent across all five bearings.
Anonymous
Feb 10, 2026
Rating: 5/5
Exact fit for standard yo-yos
I was worried about the dimensions but they fit my standard size yo-yo perfectly. The 6.3mm inner diameter is spot on. Shipping was fast too.
Q: How many bearings are included in one order?
A: Each package contains exactly 5 stainless steel R188 bearings, enough for multiple yo-yos or replacements.
Q: Will these fit a Duncan Imperial yo-yo?
A: Yes, the R188 size (6.3x12.7x4.7 mm) is compatible with most standard size yo-yos including the Duncan Imperial.
Q: Are these bearings pre-lubricated?
A: No, these come unlubed from the factory to ensure maximum dead sleep performance. You can add oil if you prefer a responsive feel.
Q: What is the best way to clean these bearings?
A: We recommend using a citrus-based solvent or specialized bearing cleaner. Avoid water as it can cause rust on stainless steel over time.
Q: What is the difference between U-groove and C-groove?
A: U-groove bearings have a concave shape that offers a balance between sleep time and responsiveness, while C-groove is flat for maximum sleep.
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