Is the 7mm the inner diameter for the axle or thickness?

Thickness they are for 8mm axels

Yes, Oldboy ceramics are 7mm. More specs: 608RS ZrO2 Ceramic bearing size: 8 x 22 x 7mm. Chrome steel ring with white balls. One polymer shield. The density of the ceramic balls is 7.81 g/cm3.

Hi what are the sizes of these bearings? thanks

Oldboy ceramics bearings are 8 x 22 x 7mm. Oldboy bearings will fit in any normal longboard or skateboard.

What oil is best to use after you clean these ceramic bearings? I tried bones speed cream but the bearing start to drag after around ten minutes use.

people tell me off, but honestly, I just use gt85 spray oil that you buy for mountain bikes for any bearings I have, and it works perfect, get a bones cleaning kit or make one first and use some isopropynol to clean the hell outta the bearings, then drown them in the oil. Never had an issue with bearings dragging. But I do mostly skate parks where its cleaner than the mean streets

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Oldboy Premium Ceramic Skateboard Bearings (Ceramic)

Oldboy Premium Ceramic Skateboard Bearings (Ceramic)

Product ID: 90365341

Details

Bearing number
608RS
Brand
Oldboy Sports
Item dimensions L x W x H
7 x 7 x 6.2
Item weight
0.1 Kilograms
Material
Ceramic

🔥Super hard ceramic balls for max speed

⚙️608RS precision ball bearing

🛡️One-shield design for easy maintenance

Description

🛹 Elevate your ride — glide faster, last longer, and skate smarter with Oldboy Ceramics!

BUILT TO LAST - Super hard zirconia ceramic density (7.80 g/cm³) outlives metal bearings by miles.
RIDE LIKE A PRO - Premium ceramic balls reduce friction for ultra-smooth, high-speed cruising.
JOIN THE CLUB OLDBOY - Every set includes a signature sticker and supports youth outdoor leadership.
EFFORTLESS MAINTENANCE - One-shield design means quick cleaning and hassle-free lubrication.
VERSATILE COMPATIBILITY - Fits skateboards, longboards, scooters, inline, quad, and hockey skates.

Oldboy Premium Ceramic Skateboard Bearings (608RS) feature super hard zirconia ceramic balls that reduce friction and wear, enabling smoother, faster rides. Designed with a one-shield casing for easy maintenance, these bearings fit all standard skateboards, longboards, scooters, and more. Engineered for durability and high performance, they come in an 8-count set with a signature Oldboy sticker, supporting outdoor youth programs with every purchase.

Specifications

ASIN	B075QLMQW6
Bearing Number	608RS
Bearing Type	Ball Bearing
Best Sellers Rank	136,255 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 81 in Skateboard Bearings
Brand	Oldboy Sports
Compatible Lubricant	Oil
Customer Reviews	4.6 4.6 out of 5 stars (108)
Included Components	Skateboard Bearings Set
Item Dimensions	7 x 7 x 6.2 centimetres
Item Thickness	7 Millimetres
Item Weight	0.1 Kilograms
Manufacturer	Oldboy
Manufacturer Part Number	Oldboy-4
Material	Ceramic
Model Number	OBCZrO2UK
Number of Items	4
Outside Diameter	22 Millimetres
UPC	799040864252
Unit Count	8.0 count

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