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A Nitrile Rubber O-Ring should be fitted into the assembly of the wheel when fitting ANY of the TRAMPA HYPA, SUPERSTAR or MEGASTAR hubs when fitting onto any of the TRAMPA Trucks that are using 9.525mm or 12mm Axel's. Doing so prevents rattles & gives the best assembly combination for the TRAMPA Wheels onto the TRAMPA Trucks
Fitting the O-Ring alongside the Bearing Support Spacer, in-between the Bearings, prevents unwanted rattles that can generate from the Bearing support spacer pushing against against the bearings... Over time, during the usage of your board, the bearings & spacers are put under a lot of force. Ultimately this force has to go somewhere... The Bearings use a Steel ring in their assembly where as the Bearing Support Spacers, to save weight are made from Aluminum. Steel is much stronger than Aluminum & when forced against each during turns & carves there is a ot of force, overtime the aluminum will loose out every time! This is what happens to your spacers between the bearings, the Bearings put force onto your spacers as a consequence over time the spacers shrink... With enough time riding hard for an annoying rattle to start.... That's why we fit these little O-Rings re able to absorb the forces, giving a bit of give, consequently preventing any unwanted rattles
You should fit 8mm Rubber O-Ring to 9.525mm Axle & you should fit 10mm Rubber O-Rings to 12mm Axles.... Its good to stretch them into position...