TRAMPA's own Mountain / Kite-board Bearings measure 12 x 28 x 8mm & will fit to 12mm axles. They are officially known as 6001 2RS Bearings.
6001 tells you the bearings size whilst 2RS means the bearing has 2 Rubber Seals. The Rubber Seals are inserted into the Outer raceway & sit in contact with the Inner raceway, protecting the Single row of lubricated ball bearings housed within the enclosed raceways from the ingress of moisture, dust & dirt, retaining the pre-filled grease within the bearing, maintaining maximum performance to the board & rider for as long as possible. The rubber coated sidewalls are available in RED or BLUE & are embossed with the TRAMPA logo proving Top Quality!
TRAMPA's precision made steel bearings are polished to an internationally recognised ABEC 5 quality. (ABEC 3-5 is recognised as the industry standard). ABEC 5 polishing gives you a super smooth / super fast ride which prolongs top end roll speeds. Using Bearing Reducer Spacers if you are wanting to make these Bearings fit to 9.525mm Axles or 10mm Scooter Axles no problem....
A set of 8 Bearings comes supplied with the correct axle sized 16.5mm Internal Bearing support Spacers & Anti vibration Rubber O-Rings