ASRA - Australian Skateboard Racing Association

Bought these off Ebay purely for the price, there is a heap going for around $20.  I was interested to know if anyone had any experience with them or knew anything about them?  They've got an extended inner ring like Biltins and rubber seals (i think biltins are rubber sealed), really i just wanna know how long they last and if they clean well/easily?    
















There is some pretty detailed reviews on the manufactures website but any first hand opinions would be muy apreciado

Tags: Ceramic, VXB, bearings

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biltins have metal shields. my vxbs are normal they dont have the biltin extension :( they run rad so far for that price id defs try grab some biltin style vxbs =0
I use them in my wheel sets as alternatives to biltins. They aren't as good as biltins design-wise but are almost as good, because the inner ring doesn't extend out the shield side like Biltins (so you must use speed rings). I prefer them to Reds as a cheap bearing. Easier to clean properly than Biltins because the rubber shield pops off. Lube stays in better too because the rubber shield touches the inner ring - Biltins have a tiny gap that allow dirt in/lube out. Overall I still prefer Biltins for freeride purposes, best maintainable bearing IMHO.
Were they from aussie ebay or international ebay?

International - - Thats the ebay store


DA BEAR said:
Were they from aussie ebay or international ebay?
Yeah my next bearings will be Biltin's i think, as long as these outlast the countless sets of reds ive chewed through ill be happy, cheers man

Scotty Bomber said:
I use them in my wheel sets as alternatives to biltins....
i buy straight from the vxb website , 49 bucks , they are a little more expensive but i would compare them to normal bones super swiss 6'ers , thats what i had in before i switched to these and they were noticebley faster , i was told though by a few experienced peeps here that  get their bearings from there to make sure that they are the black ball bearings , the Si3N4 .  they said either way i think if your ridin really rough and doin alot of sliding you will trash them just like any other bearing.
oh i 4got to say , they will last longer though !!
I bought some and they're fine but I'll buy biltins next time just because you still need speed rings with the vxb biltins. I can't tell the difference speed/smoothness wise.
The VXB's are a cheap wet weather bearing we use up here. The balls are ceramic coated not fully ceramic and the coating has a tendency to chip off. They take about an hours riding to run in and once they have they are very fast until they chip. I have had some Biltins last over 2 years and the best I have had the VXB's is 6 months, that said I tend to ride the VXB's when it is wet and so lots of crap gets into them.

an extract from the smb technical data website...

CERAMICS (prefix "CB"hybrid or "CC" all-ceramic)

Zirconia (suffix "ZrO2")
• Good corrosion resistance to cold water and many chemicals
• Good high temperature performance up to 400C without cage
• Non magnetic
and electrically insualting
• Lower speed and load than steel bearings
• Not suitable for low noise applications
• Higher fracture toughness than other ceramics so better for small shock loads
• Expansion similar to steel so not a problem to use with steel shaft at high temperature.

Silicon Nitride (suffix "Si3N4")
• Very good corrosion resistance to water, salt water and most chemicals.
• Good high temperature performance up to 1000C without cage
• Non magnetic and electrically insulating
• Lower speed and load than steel bearings but Si3N4 balls are used in high speed hybrid bearings.
• Not suitable for low noise applications
• Much lighter than steel or Zirconia
• Very low expansion at high temperature

Silicon Carbide (suffix "SiC")
• Best corrosion resistance of the ceramics.
• Best high temperature performance up to 1600C without cage
• Non magnetic
• Electrically conductive
• Much lighter than steel or Zirconia
• Very low expansion at high temperature.

Bearings can be supplied with steel rings and ceramic balls (hybrid) or "all ceramic" bearings with ceramic rings and balls. These all-ceramic bearings may have steel, nylon, PTFE or PEEK retainers or be supplied as full complement type. There are many advantages to ceramic materials such as a lower friction coefficient, much greater hardness and temperature resistance.

Hybrid Bearings have steel rings and ceramic balls. Silicon nitride is the most popular for the balls as it has only 40 percent of the density of bearing steel but is much harder giving greater wear resistance. Zirconia is heavier with 75 percent of the density of steel so is less suitable for hybrid bearings.. Hybrid bearings are also capable of higher speeds. Sometimes, excessive claims are made about the high speed capabilities of hybrid bearings. They can run faster than all steel bearings due to the lower centrifugal force generated by the ceramic balls but this is partially counteracted by the lower elasticity of the balls. As the balls are harder, the contact area between the balls and the raceway is smaller which causes a higher contact pressure. Under load, this can cause the raceways to wear faster than they would with steel balls. The speed increase for hybrid bearings is approximately 30 percent with adequate lubrication. Hybrid bearings can also operate better with limited lubrication as the lower friction material generates less heat but running speed should be reduced. Hybrid bearings are also less subject to ball skidding under inital acceleration due to the lower ball density.

All-ceramic bearings have good to excellent corrosion resistance, are non-magnetic and, apart from silicon carbide, are electrically insulating. All-ceramic bearings can be used in high to very high temperatures if supplied without a cage (full complement).
Electrical resistance: Si3N4 best, then ZrO2, then SIC which is conductive.
High temp resistance: SiC best (1600C), then Si3N4 (1000C), then ZrO2 (400C)
Corrosion resistance: SIC (excellent), then Si3N4 (very good) and ZrO2 (good)
Load capacity: SIC highest then Si3N4, then ZrO2
Fracture toughness: ZrO2 best, then Si3N4, then SiC

All-ceramic bearings have lower load and speed ratings than steel or hybrid bearings. The speeds are lower due to the lower precision and roundness of the rings and the loads are lower because the material is more brittle. Under heavy loads and particularly heavy shock loads, there is a risk of cracking. For the same reason, great care should be taken with interference fits. Zirconia is the least brittle so it will handle shock loads and very small interference fits better than the other ceramic materials with silicon carbide being the most brittle. Shock loads should be avoided with all-ceramic bearings. Great care should be taken when using ceramic bearings (especially silicon nitride and silicon carbide) on steel shafts at high temperature due to the difference in expansion coefficient and the relative brittleness of ceramics. For more information see Shaft/Housing Fit

WARNING: Customers often expect very low frictional torque with low noise and vibration levels from hybrid bearings. This may be possible but the bearing rings must have very good roundness and a high quality raceway finish while the balls must also have very good roundness and surface finish. A hybrid bearing with poor roundness and raceway finish will have much higher friction levels, higher vibration and a lower maximum speed than a good quality all-steel bearing. Drag in a hybrid bearing can be reduced by reducing lubrication or running the bearing without lubrication and there are greater possibilities with hybrids than with conventional steel ball bearings but noise and vibration levels will still be high unless the roundness and surface finishes are of a high standard.

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