For organizational reasons (including a greatly increased number of online orders, emails and returns, hygienic effort, sales space that is too small), our shop in Hochheim remains closed until further notice.

Online orders will continue to be processed as normal and usually received by 2:00 p.m. shipped the same day. Unfortunately, phone and email support is currently very limited. The current processing time for emails is approx. 2-4 working days!

The current processing time for returns is currently also approx. 2-4 working days!

We ask for your understanding that there may be delays in delivery due to the circumstances. We currently work in special shifts almost around the clock and do our best to process all inquiries, orders and returns / exchanges in turn as quickly as possible.

Please support our employees, suppliers and delivery partners with your patience.

We hope that this difficult situation will be over shortly and that we can be there for you as usual in the shop and on the phone.

Stay healthy! Your Grindhouse Team

General informations about bearings

With Aggressive InlineSkates only bearings in 608 Z format are used (standard bearing). The construction of the bearings from several suppliers is always the same: The bearing consists of an inner ring (with 8 mm inner diameter), an outer ring and a cage which holds the balls and keeps them at bay. The balls move exactly between the outer and inner ring. Cage and balls are lubricated to have a longer durability, to increase speed and smoothness.

The bearing is protected against dirt and dust through a cover disc (shield) . Mostly, these cover discs are removable to allow cleaning and servicing of the bearing. Cleaning work is extremly high and is normally not made from a skater. You use the bearings as long until they do not roll in a free way anymore. Then they will replaced by new ones. There are also covering discs which should protect from water and thus from rust. But a bearing will never be completely closed and rust-free. The cover disc needs to have too much play to the inner ring otherwise the bearing would not roll. The cage which keeps the balls is often made of plastic or metal. Balls are always made of steel.

The quality unit of InlineSkate bearings is stated in „ABEC“. ABEC means Annular Bearing Engineering Committee, a Technical Committee of American Bearing Manufacturers Association (ABMA), an association of American bearing producers. The measure effects in different steps: ABEC 1, 3, 5, 7 and 9.

----> The higher a ABEC-step, the more quality a bearing has!

To have a very fast bearing it should be oiled. But it elapses and therefore attracts dirt and dust. In contrast to lubricant: It lasts long in the bearing but it is hardly fast.

The best solution is very fine lubricant, as it combines the qualities of oil and lubricant. To have a very good skate not only the bearing has to be good. A lot depends on spacer, frame and certainly wheels. A first-class wheel in combination with a first-class bearing, driven precisely through spacer and framewasher in the frame, allow the most frictionless sprint.


All bearings in our onlineshop



Assembly instruction:

If you want to know how you have to put a bearing correctly in a wheel we made a assembly instruction with pics

Click here to check the assembly instruction