304 North Cardinal St.
Dorchester Center, MA 02124
304 North Cardinal St.
Dorchester Center, MA 02124
Do bearings fit all wheel sizes? Regardless of wheel size, all skateboard bearings are the same size and will fit any skateboard wheel that Warehouse Skateboards sells. The universal measurements for bearings are 8mm (core), 22mm (outer diameter), and 7mm (width).
Do all wheels fit all bearings? You can’t go wrong. Nearly all skateboard bearings have been standardized so that all wheel and bearing brands are compatible. The standard skateboard bearing size is an 8mm inner race diameter.
Are there different bearing sizes? Most ball bearings are metric although there are inch sizes available. Interestingly, the balls themselves are usually inch sizes. Ball bearings are segregated into different classes according to their intended duty.
Does it matter what bearings you get? Almost every skateboard bearing is the same size and will fit on any skateboard wheel and truck. When choosing your bearings, it is important to think about your experience level and riding style. Bearings with higher quality parts will be faster and more durable.
Answer 1: Ball bearings make skateboards (and anything else with wheels)go faster because they reduce the friction between the wheels and their axles. In general >when things slide over each other, the friction between them causes a force that tends to slow them down.
Note : In case there is no fourth digit, then the 3rd digit indicates the bore size in mm. For example: in case of bearing 636, the bore size of the bearing will be 6mm. Thus, we can identify now that in case of bearing 6305ZZ, the third and fourth digit ’05’ means the bearing’s bore size is 25 mm.
The first digit indicates the width or height series (dimensions B, T or H). The second digit identifies the diameter series (dimension D). The last two digits of the basic designation identify the size code of the bearing bore. The size code multiplied by 5 gives the bore diameter (d) in mm.
Unlike the wheels in which they fit into, all bearings have the same dimensions- 8mm (inner diameter), 22mm (outer diameter), and 7mm (width). Each wheel requires two bearings that are usually separated within the wheel by a spacer. Bearings are measured by an ABEC rating system (1, 3, 5, 7, and 9).
All bearings will have an inner diameter (ID), an outside diameter (OD) and width (W). Bearings are sometimes referenced by these dimensions, in that order: ID x OD x W.
Bearing spacers are totally optional; longboarders and casual skaters likely won’t put enough pressure on their boards to ever need them, though they are definitely a good investment if you want to slide, do a lot of tricks, and generally skate hard. Unlike bearings, bearing spacers are not one-size-fits-all.
Choosing a Ball or Roller Bearing
As a general rule, ball bearings are used at higher speeds and lighter loads than are roller bearings. Roller bearings perform better under shock and impact loading.
Are bearings the same for all types of skating? The main skate bearing size is called a 608 bearing. This is the same size bearing for roller skates, inline skates, roller derby skates, skateboards, and scooters.
You can breathe some new life into an old set of bearings by just taking them apart and doing a good cleaning on them then putting them back together.
Skate bearings can generally be divided into two groups: Standard and Micro (Mini). Standard bearings will be either designated 608 or 627. 608 bearings have an 8mm inside diameter, a 22mm outside diameter, and they are 7mm in width.
Why Bearing Spacers are Important
Bearing spacers sit within the wheel on the axle between the two bearings. This makes sure the inner races of the bearing are properly lined up. With properly sized spacers, this will align the bearings perfectly on the axle, creating the fastest spin with minimal friction.
Any Wheel with Bearings, when properly installed on Skate Axles, should use Spacers. Tightening the Axle Nut on a Wheel without a Spacer can severely mis-align the center races of the Bearings to the outer races of the Bearings by compressing the inner races towards the center of the Wheel.
ABEC from a precision standpoint refers to the Annular Bearing Engineering Committee (ABEC) of the American Bearing Manufacturers Association (ABMA). ABEC precision levels do indeed stop at level 9 (there is no ABEC 11 precision level).
Good bearings will spin 1–2 minutes when the wheels are spun at full force by hand.
Why does lube slow the bearing down? The lube has mass that has to be moved out of the way while the bearing rotates. During a hand spin, those little balls don’t have much mass behind them to push the lube out of the way. Thus hand spins are fastest when the bearing has very little or no lubricant.
Bearings are measured by their inner diameter, outer diameter, and width; the size of a bearing is normally listed as such: ID x OD x W. These measurements are normally taken in millimeters, but can be converted to inches.
The letters after the bearing number indicates the presence / absence / type of shielding or sealing and any other specialties in the bearing.
A: Inner diameter code: In general, the bearing inner diameter code for bearing inner diameter (the last two digits of the basic code) × 5 = inner diameter (mm), for example, the inner diameter of bearing 6204 is 04 × 5 = 20mm.
Abec 7. Industry standard size: 608 with a 8mm core, 22mm outer diameter, and 7mm width. Pre-lubricated for a smooth, fast ride.
Super REDS™ are a superior bearing, using higher quality steel races, better quality and grade balls, and a superior surface finish. The result is a bearing that is as fast as REDS™ but quieter, smoother, and longer lasting. The story of Ceramic Super REDS™ is simple.
Roller bearings are more rigid than ball bearings
Due to the line contact between the rolling elements and raceways, it is higher in roller bearings than in ball bearings. ➤ Figure shows typical characteristic curves for the radial deflection of various bearings with the same bore diameter.