aggressive rollerblading

Question
QUESTION: i have an aggressive skate wich is the rollerblade solo hype and i have some questions:
1) can i choose any bearing with abec rating? because i can't find the specified bearings for this rollerblade.
2)how many ratings their is such as abec? and how can i find similarity to buy an abec bearing for other ratings? and thank you for answering my questions

ANSWER: Hi Omar,
  Below is a very detailed explanation of bearing ratings etc. which would be good to keep as a reference.  But to make a long story short, yes you can put any abec rated bearing in your skate and the manufacturer doesn't matter.  The only thing you have to watch is the size of the whole in the middle of the bearing.  That whole has to match the size of the whole in the bearings you already have.  Inline bearings usually have an 8mm whole.  But as for abec ratings?  You can use whatever rating you can afford.  


ABEC 1 bearings are the least precise, the least expensive and the most durable.

ABEC 3 bearings are commonly found in very low budget children's inline skates.

ABEC 5 bearings are usually found on recreational inline skates. These bearings provide reasonable roll for new skaters and social skating activities.

ABEC 7 bearings are smoother and faster, but considerably more expensive.

ABEC 9 and other higher rated bearings are used by competitors, racers and other demanding skaters who are willing to pay more for high performance.

In addition to the ABEC bearing rating system, other international standards include ISO (International Organization for Standardization) classes where the lower the class the more precise the bearing (which is the opposite of the ABEC rating system) and DIN (German National Standards Organization) ratings where a lower DIN rating is also more precise. All of these rating systems are used in industries that use bearings, but the ABEC system is more commonly seen in use by skating equipment manufacturers.

Use this chart to compare DIN, ISO and ABEC ratings systems:

DIN P0 = ABEC 1 = ISO 0 (or "normal")

DIN P6 = ABEC 3 = ISO Class 6

DIN P5 = ABEC 5 = ISO Class 5

DIN P4 = ABEC 7 = ISO Class 4

DIN P2 = ABEC 9 = ISO Class 2


Today many skating equipment companies are naming the ratings of bearings they produce in other ways, too.

Rollerblade uses "SG" rated bearings.

Bones Bearings are Skate Rated?

K2 uses "ILQ" rated bearings.

This only means that these K2, Bones and Rollerblade bearings have not been inspected by the Annular Bearing Engineering Committee. But, the ratings name does not affect their quality.

Also consider that many wheels have space or bearing spacers between the bearings when they rest in the wheel core. Quad roller skates can have either a 7mm axle using bearing number 627 or an 8mm axle using bearing number 608. This space and how the wheel assembly fits on the axle will affect performance.

Usually, inline skates come with wheel cores designed to fit a standard 608 sized bearing, and a few speed and fitness skates use 688 sized micro bearings. Most responsible skate manufacturers install bearings and wheel assemblies that are appropriate for a skate's intended use. And bearings can be switched or upgraded on any inline skate, if needed, as long as the wheel core matches the bearing size.


---------- FOLLOW-UP ----------

QUESTION: thanks for the helpful answers but i have one last question:
what is the best aggressive skates site?

Answer
There are quite a few good aggressive web sites so it would be hard to say which one is the best.  Here are a couple that I think you'll like.  They have a lot of info and they're all about aggressive skating.

http://www.grindside.com/

http://www.eserv.co.uk/irl/genx/aggrosk8.html

Videos:   http://www.aggressivemall.com/articles.asp?id=162

Terms:    http://www.angelfire.com/theforce/ofskate/inline.html

Enjoy
Pat